what is the reasoning
#4
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The reason is twofold. First, you want to eliminate as many as possible suspended particles and contaniments. If left in there, it will be sludge by springtime. Second, used engine oil becomes very acidic after it contains combustion byproducts. This acidic oil will contribute to corrosion.
#5
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Join Date: Nov 2002
Location: LONG ISLAND/LAKE MURRAY
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I will change my oil before winterization substituing 1 quart of marvel mystery oil. Will change oil again in the spring. Seems to help. When I disassemble the engine for routine maintenance, everything looked as good as the day it was assembled.