About 75W-90 Marine Gear Lube
75W-90 Marine Gear Lube for compatible differentials and gear assemblies. Compare the current AMSOIL application information with your equipment’s service documentation before planning the job. Keep the product code AGMPK-EA handy when reviewing package options or asking Jeff a question.
Before you choose
Check the gear-oil viscosity and specification and any limited-slip requirements. A hypoid gear lubricant is not automatically suitable for a synchronized manual transmission.
Can this replace the fluid in any gearbox?
No. Gear assemblies have different lubrication and friction requirements. Use the product only where the specification and application list match the component.
Product information reviewed September 7, 2026. Read AMSOIL’s current details.
