The 90 non E was Top Tier . Been many years since the drop of T.T..
Mower oil recommendations
- Thread starter lgndryhr
- Start date
Rotella or equivalent 15W-40 is what I would use. I've used a lot of different (cheaper) oils in my small engines and if I really want to use the good stuff I'll splurge on Briggs 30.
I have the same motor in my Bob-Cat, CRZ48. Just got filters for the hydro gear and engine. The Hydro gears call for 20w50. I just got some Mobil 1 15w50....same difference really.
I reckon just just the same stuff in the gears and engine.
I reckon just just the same stuff in the gears and engine.
I aint mowing the lawn when its 14F outside.......just saying
sissy!
What’s wrong with K-Tech? I have been using K-Tech 10W-30 in my Honda mower for years. I get it at a yard equipment shop.
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Briggs engeins are not to picky, there number 1 requrirment is having enough oil. Keep it full, change it once a year with somthing brown and slippery then enjoy using your Briggs.
Have the same 24 hp Kawasaki V-twin in my Ariens (aka Gravely) zero turn. I use 5W-40 Delo synthetic diesel oil in it. With a larger PH3600, or equivalent other brand, filter. Change it each end of mowing season before winter, typically about 60-70 hours in a season. Mow 2 acres with it. Bought a bunch of the Delo on Advance Auto clearance in late 2024 so that's the current 5W-40 synthetic in use.
I also have an old Cub Cadet riding mower with the Vanguard B&S V-twin, I think it's 18 hp from memory. I use the same Delo 5W-40 and 3600-type filter on it. It gets a lot less use as mostly just used for pulling things behind, not mowing. So I don't change it out until a few years use.
Truthfully, any 30 or 40 weight oil is probably fine. But being air cooled I like the 40 weight. Also air cooled tend to have bigger clearances and more blow-by contamination, so the diesel oil seems a good fit since they are intended for diesels with more blow-by.
I also have an old Cub Cadet riding mower with the Vanguard B&S V-twin, I think it's 18 hp from memory. I use the same Delo 5W-40 and 3600-type filter on it. It gets a lot less use as mostly just used for pulling things behind, not mowing. So I don't change it out until a few years use.
Truthfully, any 30 or 40 weight oil is probably fine. But being air cooled I like the 40 weight. Also air cooled tend to have bigger clearances and more blow-by contamination, so the diesel oil seems a good fit since they are intended for diesels with more blow-by.
Amsoil Small Engine Oil . 10w-30
I am running Amsoil Small Engine 15w-50 in both mowers this season.
Whatever leftover oil I have laying around. I change it annually. The engine sounds great. When my neighbors struggle with sick sounding mowers, mine proudly sounds like a turbine engine 
This or 10W-40 when warm.
CleanSump
Site Donor 2026
What's left over when I change our BMWs and Mercedes with LL-01 and MB 229.51 oil.
Did you choose an oil for your mower already? If yes, what oil and viscosity?
If you haven't picked a motor oil for the B&S yet, I would recommend Mobil 1 0W-40 FS Euro. That is what I use in my B&S engine, and it runs quieter than it does on the 30HD that B&S recommends. The viscosity will be good for your climate. Not only is it a very good oil, but I see you use it in your BMW cars, so you will already have it on the shelf.
Amsoil Small Engine 15w-50 for both mowers this season. Will see how they do and adjust accordingly.
Adjust to what??
Might try 10w-40 next season for the B&S JD and swap back to for the KW zero turn. Might not.
Always run air cooled engines max throttle when mowing. Napa 15w50 syn is on sale, on a regular basis, less than $6 a quart.
I usually run Kawasaki syn 15w50 in my kubota. My buddy has a exmark w/FX 805, over 3000 hours on it, nothing but Kawa 15w50, every 50-100 hours.
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