ULTRA 1PLUS Full Synthetic Gear Oil SAE 75W-90 — 1 Gallon, API GL-5 MT-1, Limited-Slip Protection

ULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is a GL-5/MT-1 rated lubricant designed to protect differentials and axles with limited-slip compatibility and reliable all-season performance.

This full synthetic 75W-90 gear oil combines extreme-pressure additives, friction modifiers for limited-slip systems, and oxidative-resistant base stocks to deliver consistent protection across a wide range of temperatures and loads. Formulated to meet API GL-5 and MT-1 standards, it maintains film strength under shock loading and reduces wear, while resisting varnish and foam that can degrade performance. It’s offered in a convenient 1-gallon container for retail users, and is also available in a 5-gallon pail for fleets and shops seeking bulk value.

How does this gear oil protect gears under heavy loads?

The formula includes anti-scuffing extreme-pressure additives that form a protective film on gear teeth during high torque and shock events. That film reduces metal-to-metal contact and slows wear, helping gears and bearings last longer under severe service conditions.

• Anti-scuff additives reduce scoring under shock loading
• Stable film strength maintains lubrication at high contact pressures
• Reduced maintenance needs from extended component life

Will ULTRA 1PLUS 75W-90 work with limited-slip differentials?

Yes — the oil contains dedicated limited-slip friction modifiers designed to eliminate chatter and ensure smooth torque transfer in clutch-type differentials. It balances slip control with protection so limited-slip systems operate quietly and predictably.

• Engineered LS additives prevent differential chatter
• Smooth clutch engagement for consistent traction feel
• Compatible with most limited-slip designs that accept GL-5 fluids

How does it perform across temperatures and seasons?

As a full synthetic SAE 75W-90, this gear oil flows freely at low temperatures for easier cold starts and retains viscosity and film integrity at high operating temperatures. The synthetic base resists oxidation and varnish, so the fluid keeps protective properties longer between service intervals.

• Excellent cold-flow characteristics for winter starts
• High-temperature stability prevents breakdown and foaming
• Oxidation resistance reduces sludge and deposit formation

What sizes and applications are best for this product?

Primarily sold in a 1-gallon container for consumer retail use, ULTRA 1PLUS 75W-90 is also available in a 5-gallon pail for workshops and fleets. It’s suitable for automotive and light-truck differentials, transfer cases specifying GL-5/MT-1, and heavy-duty axles where a heavy-duty synthetic gear oil is recommended.

• 1-gallon packs for DIY and retail customers
• 5-gallon pail option for shops and fleet maintenance
• Recommended for GL-5/MT-1 specified differentials and axles

Who is this for: ULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is aimed at motorists and professional technicians who need robust, all-season gear protection with limited-slip compatibility. It suits drivers who tow or carry heavy loads, shops servicing mixed vehicle fleets, and anyone wanting synthetic-grade performance to extend gear and bearing life while minimizing noise and maintenance downtime.