Marine Oil & Lubes

Protect your boat’s engine with Sierra marine engine oil and lubricants from SierraParts.com. We carry boat oil, including synthetic oil for 2-stroke and 4-stroke engines, as well as options for diesel engines. Keep your vessel running smoothly with marine grease for superior corrosion protection and gear lubricant to maintain optimal performance in your lower unit and drivetrain. Trusted by boater for nearly 60 years, Sierra products are backed by and industry leading warranty.