One more suggestion for your 4-cycle lawn engines.

After the last cut of the season I change the oil so that come next spring all I need to do is put in fresh gas and it ready to go (provided your blades are sharp).

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles