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Category 02

Gear Oil
Additives.

Sulfur-phosphorus EP packages and supporting chemistries for automotive axle, manual transmission, industrial CLP, and worm-gear service — GL-4, GL-5, MT-1 and DIN 51517 Part 3 calibrated.

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A curated selection — the most-asked-for product codes in each driveline additives subcategory. Click any code to view full specifications.

3 products in this subcategory

Automatic Transmission Fluid (ATF)

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4 products in this subcategory

Combined GL-4 / GL-5

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4 products in this subcategory

Heavy Duty Manual (MT-1)

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10 products in this subcategory

Hypoid Axle (GL-5)

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6 products in this subcategory

Industrial Gear (CLP DIN 51517)

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8 products in this subcategory

Manual Transmission (GL-4)

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Treat Rate Range
2.5 – 7 % wt
Typical MOQ
200 kg (drum)
Packaging
200 L drums · 1000 L IBC · Bulk tanker
What these additives do

Sulfur-phosphorus chemistry, calibrated for the load class your gear sees.

EP (extreme pressure) additives protect gear teeth where elastohydrodynamic film breaks down — typically a hypoid axle under load, a worm gear, or a shock-loaded industrial drive. The chemistry works by forming a sacrificial reaction film of iron sulfide and iron phosphate on the contact surface, preventing micro-welding and scuffing.

The trade-off: aggressive EP chemistry attacks yellow metals (bronze, copper alloys) used in synchroniser rings and worm gears. So a single "gear oil additive" isn't a universal answer. GL-4 chemistry is milder, suited to manual transmissions with brass synchros. GL-5 is more aggressive, suited to hypoid axles. MT-1 sits in between for commercial heavy-duty manual transmissions. We supply each calibration separately — and a combined GL-4/GL-5 system for OEMs that want a single oil for both.

Chemistries we supply
EP Package — GL-4 (mild S-P) EP Package — GL-5 (heavy S-P) EP Package — MT-1 (HD manual) EP Package — combined GL-4/GL-5 EP Package — Industrial CLP (DIN 51517-3) Worm gear / cu-friendly EP Rust inhibitor — ASA Rust inhibitor — alkenyl succinic Foam suppressant — silicone Foam suppressant — non-silicone Demulsifier Polymeric VII for VI 130+ grades
Typical Performance Targets
ParameterSAE 80W-90 GL-5SAE 85W-140 GL-5ISO VG 220 CLP
KV @ 100 °C (cSt)15.0 – 16.524 – 2617 – 19
4-ball weld load (kg, ASTM D2783)≥ 250≥ 315≥ 250
Timken OK load (lb, ASTM D2782)≥ 60≥ 65≥ 50
Cu corrosion (ASTM D130)≤ 2a≤ 2a≤ 1b
Foam Seq I / II / III (mL)≤ 25/0/25≤ 25/0/25≤ 25/0/25
Treat Rate (% wt)5 – 66 – 72.5 – 4

Typical values. Detailed TDS available on enquiry.

Applications

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