B&S Opposed Twin oil choice

Joined
Nov 3, 2013
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65
Location
WI
I've got an 18hp Briggs opposed twin vertical shaft on a 1990 Craftsman garden tractor. The engine owners manual shows that SAE 30, 10W-30, or 10W-40 can be used for summer operation. It has about 500hrs currently. What's everybody's thought about using 15W-40 or synthetic 5/10W-30 in it? Currently I've been running conventional 10W-30 and always stays at the full mark on the dipstick between changes. Thanks
 
Joined
Oct 15, 2005
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1,250
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Tennessee
I dont think it matters a whole lot. I have been running 15w-40 rotella in my Kohler single. Those engines usually dont care. If a 10-40 can hold up, a 15w-40 will be much better.
 
Joined
Oct 9, 2011
Messages
5,091
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USA
Got a 1978 B&S 16hp Synchro Balanced twin,non lined bores,always ran 10w30 of whatever was around.Runs fine,burns no oil.Bought new,one owner.Great engine.
 

TriMoto

Thread starter
Joined
Nov 3, 2013
Messages
65
Location
WI
Great to know. This is my first twin, I know the single cyl Briggs flatheads are bulletproof plus this one has iron liners. I've read about these opposed twins with 3000+ hrs still running strong. I think I'll do 15W-40 in summer since straight 30 is getting hard to find around here and syn 10W-30 in winter for plowing.
 
Joined
Jul 23, 2008
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9,808
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New Jersey
On my 1966 4 hp briggs (allis charmers) i have always used strait 30 it smokes a little but runs great the only thing i did was convert it to electronic ignition because the points turned to dust lol i never tried 15w40 i wonder if it would smoke less.. My dad got this in 66 when i was a baby back then it was a commercial machine and even with the 4hp it goes through anything. Starting is hard sometimes but i always get it running. It seems that all my briggs engines without a prime button seem to be hard to start
 
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