Originally Posted By: Bror Jace
Another person who recommends once per year in your case. 40-50 hours is a good change interval. On commercial equipment that's one full work week. For a residential machine, that's once per year.
PLUS, with a spin-on filter, you are not getting the wear debris recirculated through the motor. This is the #1 reason why I recommend more frequent changes in most OPE ... outdoor power equipment as the smaller motors (up to 10-12hp) do not typically have spin-on filters.
Changing your oil at the end of the season means all the internals will be coated/submerged in fresh oil, as opposed to used oil contaminated with acids and other byproducts of combustion. Sitting in your engine's sump with it not running is not degrading the oil ... it will be fine come spring.
You didn't mention the oil you are using. Multi-grade? straight weight? Synthetic? Conventional?
You and I think exactly alike on this. I like the idea
of it sitting up with fresh oil, although thats just how I speculated it would be best.
Brand & weight? I mow my mother-in-laws yard, and use the case of O'Riellys 20-50 my late F-I-L had left over in the garage. In another thread many posters felt that the 20-50 would actually be great for the 100 degree TX heat, and 3 hr. per mow times.
Mower is 8 years old, and working great with this routine (so far). Thank you all for the great replies.
