Want to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional oil analysis kits. Results are typically received in a few days via email. Shop now. Mercury Premium Plus TCW 3 2 Stroke / Cycle Outboard Oil - Gallon - 92-858027K01 Specifically formulated with a higher concentration marine additive package to meet the needs of high-horsepower outboards including direct fuel-injected engines in extreme marine operating conditions. Far exceeds Mercury in-house test standards, which are more stringent than the industry's TC-W3 standard. Cleanest burning, reduces carbon build-up in exhaust system and superior lubrication. Meets all outboard and personal watercraft manufacturers' recommendations for use of TC-W2 and TC-W3 oils in pre-mix or oil-injected 2-cycle applications. Provides warranty protectio