We run every stern drive engine on special marine polypropylene anti-freeze for winterization.This ensures all engine blocks, manifolds, coolers, pumps, and hoses are flushed with anti-freeze to prevent freeze breaks or internal corrosion.
The winterization service also includes stabilizing the fuel with Mercury Quik-Stor treatment, fogging the engine with Mercury Storage Seal thru the intake or thru the fuel system,
We do recommend changing the engine oil and filter every year. This prevents the contaminates in the oil from setting in the engine while in storage.
Stern drive service is also recommended every year and is a great way to prevent costly repairs.