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Best Practices for Doing Oil Changes?
This question applies to my snow thrower but I assume would be applicable to lawnmower engines too.
My understanding is that over time, the motor oil in a small engine degrades and can have contaminants, acids, etc. that can harm the engine. My question is this: what is the best practice for doing motor-oil changes?
Is the best practice to:
(a) drain the oil and leave the oil reservoir empty until filling it at the beginning of the next usage season? (putting a notice on the machine so no one starts it before adding oil)
(b) drain the oil and immediately refill with new oil, even though the fresh oil will sit several months before being used?
(c) leave the old oil in the reservoir until time to use the machine again, and then change it?
(d) change the oil at the end of a working season and then change it again at the beginning of the next working season? (Not my favorite choice, for obvious reasons.)
Please provide a rationale for your preferred method.