Quote:
Originally Posted by Fat Charlie
Outside of commercial use, any motor oil at all should keep a mower happy forever. I use El-Cheapo 5w30 once a year whether it needs it or not.
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I operated an old Sears riding mower that leaked oil. I'd know when it was time to add oil because the motor would seize and die. I'd add oil and continue cutting with no noticeable loss of performance. Did it hundreds of times.
Lawn mowers can be horribly neglected and just keep on working.