If it works for you, great. “Ran good” is hardly a definitive analysis, though.I did an experiment when I worked at an auto parts store. I took a bunch of disguarded oil jugs, tipped them up to let them drip into a 1 gallon jug. After a week or so the first 1 gallon was nearly fully. Only did it to test the old wives tale that you can't mix oil.
So a mix of every weight, every brand the store sold and then some went into my riding lawnmower. That lawnmower ran like that for years till I sold it.
Mixing different motor oils doesn't appear to do anything bad.
Your lawnmower isn’t representative of anything I own, so, you’ll understand if I don’t try out your test on any engine of mine.
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