In all my lawn / garden / generac gen ---->Nothing but RTS T6 5W-40!
If I remember right T5 10W-30 has a good amount of ZDDP!
I have & always will add TCW3 (Pennzoil Marine) XLF @640:1.
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When I was 10 & began mowing yards to earn summer $$. Also having to mow my family's & grandmothers yard! I bet I put at least 5 hours of use on my mower every day except Sundays!
I remember quite clearly Dad showing me how to change oil -->1 Time as well as cleaning the air filter. Dad always kept a case of Quaker State 10W-40 in the garage cabinet. If I recall dad had me change the oil & clean the air filter @ the first of every month. I guess to begin teaching me the madness of Preventive Maintenance. (He Succeeded)!
Oh I still wish I had that Red/White Snapper! Every thing was Metal! Only thing that was not was the tires & plastic clip that held the back of the bag together & the pull string! (Built to Last)!
Quite different from the POS plastic Mess they produce now. (Which I own). ---->They now produce disposable mowers!
My new Snapper is just like the one below:--->Motor is a decent 7.75 Briggs (Professional). The body/deck is junk.
The motor really seems to like 2oz Liqui Moly MoS2 with every OC.
Still have a Qt of M1 Racing 0W-30 waiting to be poured in! Incredible additive package. But it is a racing oil
https://bobistheoilguy.com/forums/ubbthreads.php/topics/2143222/all/New_Mobil_1_Racing_0W30_VOA