Larger vessels may run medium-speed engines and reduction gears that need marine oils this catalog does not carry. Check each engine’s and gear’s specification before choosing.
Regulatory and environmental rules
Vessel operators follow Coast Guard inspection rules and, for some vessels, environmentally acceptable lubricant requirements under federal permits. Confirm any lubricant used in oil-to-sea interfaces meets those requirements.
Products by equipment.
Confirm the lubricant type, grade, and specifications in each equipment manual before ordering.
Main engines
High-speed marine diesels list an oil category, viscosity, and TBN guidance in the engine manual; follow it for your fuel and duty.
Shop AMSOIL directly with Jeff’s dealer number already attached, or open a business account. AMSOIL handles pricing, checkout, and shipping. If you contact AMSOIL another way, give them dealer number 30734402.
Prefer to talk it through? Email Jeff at [email protected] with your equipment, the fluid now in use, and your approximate volume.
Frequently asked questions
What oil goes in a tugboat main engine?
The category and viscosity the engine maker lists for your fuel and duty.
Do tugs need environmentally acceptable lubricants?
Some vessels do under federal permits for oil-to-sea interfaces. Check your vessel’s permit requirements.
General maintenance information. Always follow your equipment manufacturer’s requirements and the current product data. Product availability, pricing, and account terms are set by AMSOIL.