Protect your 1989–1993 5.9 Cummins Marine engine with premium-grade fluids and filters engineered for harsh marine duty. Our high-zinc 15W-40 marine diesel oil ensures superior lubrication under load and heat. Fleetguard oil and fuel filters deliver maximum filtration and reliability, preserving injectors and turbo performance. Marine-grade extended-life coolant with proper SCA additives defends against liner pitting and scale buildup.

Stock up now—extend engine life and dominate the water with every start.