Primary
Primary ZDDP
Primary alcohols · Per TDS
Best thermal stability — for industrial, hydraulic and gear oils requiring long service life and slow tribofilm formation.
View detailsZDDP Lubricant Additive — Antioxidant & Anticorrosion Supplier | Sinolook
★ 4 ZDDP · 3 Phenolic · 2 Aminic — 9 Grades Total
The soul of every engine, hydraulic and gear oil — ZDDP plus the antioxidant synergy.
Primary, Secondary, C8 and Hybrid ZDDP plus phenolic (DBPC, mixed phenols, polymeric ester) and aminic (alkylated, nonylated diphenylamine) antioxidants. Nine grades engineered for API SP / SQ, ILSAC GF-6, ACEA C-class, CK-4, DIN 51524 and ISO VG specifications.
9
AO + ZDDP Grades
3-in-1
ZDDP: AW + AO + AC
Synergy
Phenolic + Aminic Pair
60+
Countries Served
About Antioxidant & Anticorrosion Additives
ZDDP plus the phenolic-aminic synergy — the oxidation defence of every modern lubricant
Base oil oxidizes from the moment it meets oxygen and heat. Without antioxidants and anticorrosion additives, an engine oil would turn into sludge within hours of operation.
Sinolook supplies the complete oxidation-defence package: ZDDP (Zinc Dialkyldithiophosphate) — the legendary multifunctional additive that delivers anti-wear, antioxidant and anti-corrosion in one molecule; phenolic antioxidants (DBPC, mixed phenols, polymeric phenolic ester) that scavenge peroxy radicals to stop oxidation chain propagation; and aminic antioxidants (alkylated and nonylated diphenylamine) that decompose hydroperoxide intermediates at high temperature. Used together, the three families deliver oxidation life 3–5× longer than ZDDP alone — essential for modern downsized turbocharged engines and extended drain intervals.
Why ZDDP Is The Soul of Engine Oil
One molecule, three functions — AW + AO + AC
No other lubricant additive matches ZDDP's efficiency. A single molecule simultaneously protects against wear, slows oxidation, and inhibits non-ferrous corrosion. After 70+ years, it remains the backbone of every engine, hydraulic and gear oil formulation.
Modern API SP and ILSAC GF-6 specifications cap phosphorus content (max 0.08% P from ZDDP). When ZDDP loading is restricted, supplemental phenolic + aminic antioxidants take over the oxidation defence load — see the synergy below.
Phenolic + Aminic Synergy
Why every modern engine oil needs three antioxidants, not one
Oxidation is a chain reaction with multiple intermediate steps. Each antioxidant family attacks a different intermediate — used together, they break the entire chain at multiple points, delivering 3–5× the oxidation life of any single antioxidant alone.
Phenolics excel below 130°C, aminics excel above 130°C — together they cover the full thermal range of an engine. Sinolook's combination of 4 ZDDP + 3 phenolic + 2 aminic grades lets you build any synergy ratio your formulation needs.
Our Antioxidant & Anticorrosion Range
Nine grades across three chemistries — build any AO synergy you need
Four ZDDP variants (Primary / Primary C8 / Hybrid Alkyl / Secondary-Primary Blend), three phenolic antioxidants (DBPC / Mixed Phenols / High Molecular Phenolic Ester) and two aminic antioxidants (Alkylated DPA / Nonylated DPA). Click any product for full TDS and bulk-supply quotation.
01
ZDDP — Primary / Secondary / C8 / Hybrid
Zinc dialkyldithiophosphate. Four variants by alcohol type — each tuned for different application severity, reactivity and thermal stability targets.
C8 · Primary
Primary C8 ZDDP
2-ethylhexyl chain · Per TDS
Premium primary ZDDP using 2-ethylhexyl alcohol — light color, excellent solubility, used in premium hydraulic and high-end industrial oils.
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Hybrid
Hybrid Alkyl ZDDP
Mixed alkyl · Per TDS
Hybrid primary + secondary alkyl chemistry — balanced reactivity and thermal stability. Versatile across engine, hydraulic and gear oil applications.
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Sec + Prim Blend
Secondary-Primary Blend ZDDP
Secondary + primary alcohols · Per TDS
The modern PCMO standard. Secondary alkyl for fast startup wear protection plus primary alkyl for thermal durability. API SP / ILSAC GF-6 ready.
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02
Phenolic Antioxidants — DBPC / Mixed Phenols / Polymeric Ester
Chain-breaking primary antioxidants. Donate hydrogen to peroxy radicals to stop oxidation chain propagation. Best below 130°C — ideal for turbine, hydraulic and industrial oils.
DBPC · BHT
2,6-Di-tert-butyl-p-cresol (DBPC, BHT)
Solid crystal · Per TDS
The universal phenolic AO — also known as BHT or T501. The standard antioxidant for transformer, turbine and hydraulic oils where light color and FDA compatibility matter.
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Mixed · Liquid
2,6-Di-tert-butylphenol Mixture
Liquid · Per TDS
Liquid alternative to DBPC — easier to blend at ambient temperature, no melting step required. Same hindered phenol chemistry, different physical form.
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High MW · Ester
High Molecular Phenolic Ester
Polymeric ester · Per TDS
High-molecular-weight polymeric phenolic AO — minimal evaporation loss at high temperatures. Preferred for modern engine oils, low-SAPS PCMO and gas engine oils.
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03
Aminic Antioxidants — Alkylated & Nonylated Diphenylamine
Peroxide decomposers. Excel at high temperature (above 130°C) where phenolic AOs lose effectiveness. Essential for turbine, gas engine, grease and ATF.
ADPA
Alkylated Diphenylamine
Octyl / butyl DPA · Per TDS
The workhorse aminic AO. Engine oils, turbine oils, gas engine oils and grease — anywhere sustained high temperatures stress the lubricant. Excellent low-volatility performance.
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NDPA · High-T
Nonylated Diphenylamine
Dinonyl DPA · Per TDS
Higher-MW dinonyl variant — best volatility resistance and high-temperature service life. For gas turbine, industrial gas engine, high-temperature grease and ATF.
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Selection Guide
Nine AO + ZDDP grades at a glance
Quick comparison across all nine Sinolook antioxidant and ZDDP products. Click any row to open the full TDS.
| Product | Type | Typical Treat Rate | Primary Application | Key Benefit | TDS |
|---|---|---|---|---|---|
| Group 01 — ZDDP (Zinc Dialkyldithiophosphate) | |||||
| Primary ZDDP | Primary alkyl | 0.5–1.5% | Industrial, hydraulic, gear oils | Best thermal stability | View → |
| Primary C8 ZDDP | 2-ethylhexyl | 0.5–1.5% | Premium hydraulic, industrial | Light color, high solubility | View → |
| Hybrid Alkyl ZDDP | Mixed alkyl | 0.8–1.4% | Engine, hydraulic, gear (versatile) | Balanced reactivity + stability | View → |
| Secondary-Primary Blend ZDDP ★ | Sec + Prim alkyl | 0.8–1.2% | PCMO API SP / ILSAC GF-6 | Modern engine oil standard | View → |
| Group 02 — Phenolic Antioxidants (chain-breaking, < 130°C) | |||||
| DBPC (BHT, T501) | Hindered phenol · solid | 0.1–0.5% | Transformer, turbine, hydraulic | Universal, FDA-compatible | View → |
| 2,6-Di-tert-butylphenol Mixture | Hindered phenol · liquid | 0.1–0.5% | Industrial oils (easy blending) | Liquid form — no melt step | View → |
| High Molecular Phenolic Ester | Polymeric ester | 0.3–1.0% | Modern PCMO, low-SAPS, gas engine | Low volatility, long service | View → |
| Group 03 — Aminic Antioxidants (peroxide decomposer, > 130°C) | |||||
| Alkylated Diphenylamine ★ | Octyl/butyl DPA | 0.3–1.0% | Engine oils, turbine, grease, ATF | Workhorse high-T antioxidant | View → |
| Nonylated Diphenylamine | Dinonyl DPA | 0.3–1.0% | Gas turbine, high-T grease, ATF | Best volatility resistance | View → |
Treat rates indicative for typical formulations. Refer to product TDS and your finished oil specification (API SP, CK-4, DIN 51524, ISO VG, etc.) for actual dosing.
Where ZDDP & Antioxidants End Up
Three application zones, three antioxidant strategies
The right ZDDP + AO combination depends on the application's temperature profile, sliding-contact severity and SAPS budget. Three classic battlefields:
Why Sinolook AO + ZDDP
Nine grades, three chemistries, one supply chain
Most additive suppliers carry ZDDP or antioxidants — not both. Sinolook delivers the complete oxidation-defence package: four ZDDP variants plus five antioxidant grades, all SGS-verified and ICP-tested for metal content consistency batch after batch.
ADVANTAGE 01
Complete oxidation-defence package
4 ZDDP grades + 3 phenolic + 2 aminic antioxidants — build any synergy ratio your formulation needs. One supplier, one PO, fewer qualifications.
ADVANTAGE 02
Tight Zn, P, S content control
ICP metal-content verification on every ZDDP batch — critical for hitting API SP / ILSAC GF-6 phosphorus limits (max 0.08% P) and ACEA C-class sulphated ash caps.
ADVANTAGE 03
Reference synergy formulations
Starting formulations for API SP / SQ PCMO, ILSAC GF-6, ACEA C-class low-SAPS, API CK-4 HDDO, DIN 51524 hydraulic, ISO VG turbine and API GL-5 gear oils — with recommended Zn:P:phenolic:aminic ratios.
ADVANTAGE 04
Drum to ISO tank, sample to bulk
Start with a 200L drum for formulation qualification, scale to IBC tote, flexitank or ISO tank for commercial supply across 60+ countries.
Related Additive Categories
Pair ZDDP + AO with anti-wear and dispersant for a complete additive package
ZDDP provides AW + AO + AC, but heavy-duty applications often need supplemental anti-wear (MoDTC, MoDTP, borate ester) plus ashless dispersant for soot control. Sinolook supplies all these families:
FAQ
Frequently asked questions about ZDDP and antioxidants
What is ZDDP and why is it called the soul of engine oil?
ZDDP — Zinc Dialkyldithiophosphate, sometimes called Zinc Dithiophosphate or ZnDTP — is the single most efficient lubricant additive ever invented. One molecule performs three critical functions simultaneously:
1. Anti-wear (AW) — forms a glassy zinc phosphate tribofilm on stressed metal surfaces (cam lobes, lifters, gears, pump vanes);
2. Antioxidant (AO) — scavenges peroxy radicals (ROO·) and decomposes hydroperoxides (ROOH);
3. Anti-corrosion (AC) — passivates copper, lead and silver bearing surfaces against acid attack.
No other single additive delivers this AW + AO + AC trifecta, which is why ZDDP has been the backbone of every engine, hydraulic and gear oil formulation for over 70 years.
1. Anti-wear (AW) — forms a glassy zinc phosphate tribofilm on stressed metal surfaces (cam lobes, lifters, gears, pump vanes);
2. Antioxidant (AO) — scavenges peroxy radicals (ROO·) and decomposes hydroperoxides (ROOH);
3. Anti-corrosion (AC) — passivates copper, lead and silver bearing surfaces against acid attack.
No other single additive delivers this AW + AO + AC trifecta, which is why ZDDP has been the backbone of every engine, hydraulic and gear oil formulation for over 70 years.
What is the difference between primary and secondary ZDDP?
The terms refer to the type of alcohol used in synthesis:
• Primary ZDDP — uses primary alcohols (e.g. isobutanol, 2-ethylhexanol). The C–O bond at the primary carbon gives the molecule excellent thermal stability and slower tribofilm formation — ideal for industrial, hydraulic and gear oils that need long service life.
• Secondary ZDDP — uses secondary alcohols. The C–O bond at the secondary carbon gives faster reactivity and stronger anti-wear film formation at lower temperatures — preferred for passenger car motor oils where engine startup wear matters most.
• Hybrid / Mixed Alkyl — blends both alcohol types for balanced performance.
Modern API SP and ILSAC GF-6 formulations commonly use a secondary-primary blend ZDDP to balance both reactivity (cold-start AW) and thermal durability (extended drain).
• Primary ZDDP — uses primary alcohols (e.g. isobutanol, 2-ethylhexanol). The C–O bond at the primary carbon gives the molecule excellent thermal stability and slower tribofilm formation — ideal for industrial, hydraulic and gear oils that need long service life.
• Secondary ZDDP — uses secondary alcohols. The C–O bond at the secondary carbon gives faster reactivity and stronger anti-wear film formation at lower temperatures — preferred for passenger car motor oils where engine startup wear matters most.
• Hybrid / Mixed Alkyl — blends both alcohol types for balanced performance.
Modern API SP and ILSAC GF-6 formulations commonly use a secondary-primary blend ZDDP to balance both reactivity (cold-start AW) and thermal durability (extended drain).
Why do modern engine oils still need phenolic and aminic antioxidants if ZDDP is already an antioxidant?
ZDDP is a powerful antioxidant but it gets consumed over time, especially under the high-temperature stress of modern downsized turbocharged engines and extended drain intervals. Supplementing ZDDP with phenolic + aminic antioxidants creates a synergistic three-layer defence:
1. Phenolic AO (chain-breaking) stops the oxidation chain by donating a hydrogen atom to peroxy radicals (ROO·);
2. Aminic AO (peroxide decomposer) eliminates the hydroperoxide intermediates (ROOH) before they form new radicals;
3. ZDDP handles residual radicals and ROOH, plus delivers its AW + AC bonus.
The combination delivers oxidation life 3–5× longer than ZDDP alone, especially critical for low-SAPS oils where ZDDP loading is restricted by phosphorus limits.
1. Phenolic AO (chain-breaking) stops the oxidation chain by donating a hydrogen atom to peroxy radicals (ROO·);
2. Aminic AO (peroxide decomposer) eliminates the hydroperoxide intermediates (ROOH) before they form new radicals;
3. ZDDP handles residual radicals and ROOH, plus delivers its AW + AC bonus.
The combination delivers oxidation life 3–5× longer than ZDDP alone, especially critical for low-SAPS oils where ZDDP loading is restricted by phosphorus limits.
What is the difference between phenolic and aminic antioxidants?
Phenolic antioxidants (DBPC, mixed phenols, polymeric phenolic esters) work as chain-breaking primary antioxidants. They donate a hydrogen atom to peroxy radicals (ROO·), stopping the oxidation chain reaction. They work best at moderate temperatures (<130°C) and contribute zero sulphated ash.
Aminic antioxidants (alkylated and nonylated diphenylamine, ADPA / NDPA) work as both chain-breaking and peroxide-decomposing antioxidants. They excel at high temperatures (>130°C) where phenolics begin to lose effectiveness — making them essential for turbine oils, gas engine oils, ATF and any high-temperature application.
Most modern formulations use a phenolic + aminic combination to cover the full thermal range of engine operation, plus ZDDP for the AW + AC bonus.
Aminic antioxidants (alkylated and nonylated diphenylamine, ADPA / NDPA) work as both chain-breaking and peroxide-decomposing antioxidants. They excel at high temperatures (>130°C) where phenolics begin to lose effectiveness — making them essential for turbine oils, gas engine oils, ATF and any high-temperature application.
Most modern formulations use a phenolic + aminic combination to cover the full thermal range of engine operation, plus ZDDP for the AW + AC bonus.
How much ZDDP should I use in my formulation?
Typical treat rates by application:
• Passenger car motor oil (PCMO): 0.8–1.0% ZDDP — capped by API SP / ILSAC GF-6 phosphorus limit of 0.08% P max. Use Secondary-Primary Blend ZDDP.
• Heavy-duty diesel (HDDO): 1.2–1.4% — API CK-4 / FA-4 allows slightly higher P. Secondary or Hybrid ZDDP.
• Industrial & hydraulic: 0.5–1.5% depending on AW severity. Primary or Primary C8 ZDDP for thermal stability.
• Gear oils: 0.5–1.0% often combined with ashless EP additives. Primary ZDDP.
Always reference the finished oil specification (API SP, CK-4, DIN 51524 part 2, API GL-5, etc.) and your starting formulation rather than treating these as design targets.
• Passenger car motor oil (PCMO): 0.8–1.0% ZDDP — capped by API SP / ILSAC GF-6 phosphorus limit of 0.08% P max. Use Secondary-Primary Blend ZDDP.
• Heavy-duty diesel (HDDO): 1.2–1.4% — API CK-4 / FA-4 allows slightly higher P. Secondary or Hybrid ZDDP.
• Industrial & hydraulic: 0.5–1.5% depending on AW severity. Primary or Primary C8 ZDDP for thermal stability.
• Gear oils: 0.5–1.0% often combined with ashless EP additives. Primary ZDDP.
Always reference the finished oil specification (API SP, CK-4, DIN 51524 part 2, API GL-5, etc.) and your starting formulation rather than treating these as design targets.
What is DBPC / BHT / T501 — are they the same thing?
Yes — these are all names for the same chemical: 2,6-di-tert-butyl-p-cresol.
• DBPC — the chemistry abbreviation used in lubricant industry
• BHT — Butylated Hydroxy Toluene, used in food and cosmetic industry
• T501 — the Chinese lubricant additive code (T501 antioxidant)
It's the most widely used phenolic antioxidant globally — a hindered phenol that scavenges peroxy radicals. Light color, FDA-compatible at appropriate concentrations, suitable for transformer oils, turbine oils, hydraulic fluids and many industrial lubricants. Sinolook supplies DBPC as a solid crystal (most common) and also offers a liquid 2,6-Di-tert-butylphenol Mixture for easier blending without a melt step.
• DBPC — the chemistry abbreviation used in lubricant industry
• BHT — Butylated Hydroxy Toluene, used in food and cosmetic industry
• T501 — the Chinese lubricant additive code (T501 antioxidant)
It's the most widely used phenolic antioxidant globally — a hindered phenol that scavenges peroxy radicals. Light color, FDA-compatible at appropriate concentrations, suitable for transformer oils, turbine oils, hydraulic fluids and many industrial lubricants. Sinolook supplies DBPC as a solid crystal (most common) and also offers a liquid 2,6-Di-tert-butylphenol Mixture for easier blending without a melt step.
Can ZDDP, phenolic and aminic antioxidants be used together with detergent and dispersant?
Yes — every modern engine oil uses all five. A typical API SP / ILSAC GF-6 PCMO formulation:
• Sec-Prim Blend ZDDP at 0.8–1.0% (AW + AO + AC primary backbone, capped by P limit);
• High MW Phenolic Ester at 0.5–1.0% (low-volatility phenolic AO for moderate temperatures);
• Alkylated Diphenylamine at 0.3–0.8% (high-temperature aminic AO);
• Calcium salicylate or sulfonate detergent at 2–4% (hot-zone deposit control);
• PIB Bis-Succinimide dispersant at 3–5% (cold-zone sludge suspension).
The detergent works hot, the dispersant works cold, ZDDP protects sliding surfaces, phenolic + aminic AOs protect the base oil at every temperature. See sulfonate detergents, salicylate detergents, ashless dispersants and anti-wear agents.
• Sec-Prim Blend ZDDP at 0.8–1.0% (AW + AO + AC primary backbone, capped by P limit);
• High MW Phenolic Ester at 0.5–1.0% (low-volatility phenolic AO for moderate temperatures);
• Alkylated Diphenylamine at 0.3–0.8% (high-temperature aminic AO);
• Calcium salicylate or sulfonate detergent at 2–4% (hot-zone deposit control);
• PIB Bis-Succinimide dispersant at 3–5% (cold-zone sludge suspension).
The detergent works hot, the dispersant works cold, ZDDP protects sliding surfaces, phenolic + aminic AOs protect the base oil at every temperature. See sulfonate detergents, salicylate detergents, ashless dispersants and anti-wear agents.
What packaging and MOQ does Sinolook offer?
Standard packaging: 200L drum (sample / qualification), 1000L IBC tote (pilot batches), flexitank (~20 MT), and ISO tank container (~20 MT commercial). DBPC, as a solid, is supplied in 25kg fiber drums or 1000kg bulk bags. MOQ typically 1 drum for samples and 1 ISO tank (or 25 MT bag-lot for DBPC) for commercial. Global bonded storage across strategic Asia-Pacific hubs enables fast delivery worldwide. HS Code 3811.21 for liquid ZDDP and antioxidants; 2907.13 for DBPC solid.
Can Sinolook provide TDS, MSDS, COA and starting formulations?
Yes. Technical Data Sheet (TDS), Material Safety Data Sheet (MSDS / SDS in GHS format), and batch-specific Certificate of Analysis (COA) are provided for every product in English or Chinese. We can also share reference starting formulations for common applications including:
• API SP / SQ / ILSAC GF-6 PCMO
• ACEA C2 / C3 / C5 low-SAPS PCMO
• API CK-4 / FA-4 HDDO
• DIN 51524 part 2 / 3 hydraulic
• ISO VG turbine oil
• API GL-4 / GL-5 gear oils
• EP-2 lithium and polyurea grease
With recommended Zn:P, phenolic:aminic and detergent ratios. Email sales@sinolook.com or message us on WhatsApp.
• API SP / SQ / ILSAC GF-6 PCMO
• ACEA C2 / C3 / C5 low-SAPS PCMO
• API CK-4 / FA-4 HDDO
• DIN 51524 part 2 / 3 hydraulic
• ISO VG turbine oil
• API GL-4 / GL-5 gear oils
• EP-2 lithium and polyurea grease
With recommended Zn:P, phenolic:aminic and detergent ratios. Email sales@sinolook.com or message us on WhatsApp.
Ready to source ZDDP and antioxidants from Sinolook?
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