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Sometimes, ppl overthink everything, even oil changes. Does ANYONE really think an ounce or five (of old oil) really matters to a motor? It is all arguably minutia to think a small amount of used oil would have an effect on an intricate heavy duty steel and aluminum machined automotive motor massed produced even today. Geeeze…. Imagine how much ppl obsessed over the old cast/steel machined loosely fine machined bearing'ed motors of yesteryear? Sure, todays engines are slightly more in close tolerences but they are hardly designed to stand the fires of a volcano, nor the cold emptiness of deep space! Get real!


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