75w90 / SAE 90 High Performance Fully Synthetic Marine Gear Oil
- Dispatched in 2-3 days
- 30 Day Return Policy
- Low stock - 1 item left
- Backordered, shipping soon
75W90 High Performance Fully Synthetic Gear Oil
Premium Grade Marine Transmission & Gearcase Lubricant
This 75W90 Fully Synthetic Marine Gear Oil is a modern, premium-tier lubricant engineered to provide superior protection for high-performance marine gearboxes. Formulated from a blend of high-quality synthetic base oils and advanced extreme pressure (EP) additives, it ensures maximum component longevity even under the most punishing marine conditions. Unlike standard mineral oils, this synthetic formula maintains a stable lubricating film across extreme temperature fluctuations and high-RPM operations.
Key Features
- ✔ Fully Synthetic: Superior thermal and oxidative stability.
- ✔ Yellow Metal Safe: API GL-4/GL-5 buffered sulfur formula.
- ✔ Extreme Pressure: Protects hypoid gears under heavy shock loads.
- ✔ Cold Start Flow: Exceptional low-temperature fluidity for smooth shifting.
Technical Specs
| Viscosity Grade | 75W-90 (Covers SAE 90) |
| API Specification | GL-4 & GL-5 |
| Base Oil | 100% Fully Synthetic |
| Pour Point | -57°C |
| Flash Point | > 201°C |
Compatibility / Fitment Guide
| Make/System | Application | Notes |
|---|---|---|
| Mercury / Mariner | Outboards 75HP+ | Perfect for units requiring High Performance Lube. |
| MerCruiser | Alpha & Bravo Drives | Ideal for high-load sterndrive applications. |
| Yamaha Marine | V6 & V8 Models | Replaces Yamaha HD Gear Oil requirements. |
| Volvo Penta | SX, DP, IPS Units | Suitable for Aquamatic and IPS gearboxes. |
| Suzuki Marine | DF Series Outboards | Recommended for high-performance hypoid gears. |
OEM Cross Reference
| Mercury / Quicksilver | 92-858064K01 / 858064Q01 / 92-8M0222065 |
| Volvo Penta | 1141679 / 3809443 |
| Sierra Marine | 18-9650-2 |
| Honda | 08251-999-101HE |
Questions & Answers
Is this oil suitable for Volvo Penta IPS drives?
Yes, this fully synthetic 75W-90 formula is specifically engineered to meet the stringent requirements of high-torque gearboxes like Volvo Penta IPS and Aquamatic drives.
Can I use this if my manual calls for SAE 90 or 80W-90?
Absolutely. The 75W-90 grade is a multi-viscosity lubricant that provides the protection of an SAE 90 at operating temperature while offering much better flow and protection during cold starts.
Can this be mixed with mineral gear oil?
While this synthetic oil is technically compatible with mineral oils for "drain and fill" purposes, we always recommend a complete flush to ensure you get the full high-performance benefits of the synthetic additives.
Note: Always consult your engine or transmission owner's manual for specific lubricant capacity and service intervals. Provided for use on 4boats.co.uk.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
