Engine Oil

What sort of engine is it for?

Depends on the application.

If its for an enclosed engine with oil in a sump that gets hot it might be OK as it will thin with increased temp, however if its for drip fed bearings, it might be a bit thick (unless the engine is a big un).

The manual for my R-H 1HR - 6HP open crank with drip fed mains specifies straight SAE20.

Hi ,

Its for a Crossley 1040 .

Im not too sure how hot the crankcase gets as i havent ran it for more than a half hour at a time. Thanks for the replys so far .

John

Probably shouldn't, but I tend to chuck Wilkinsons 20W50 in just about everything four stroke!

My Crossley 1075 barely breaks into a sweat & only by keeping the pot covered can I get as high as 80oC .

I use modern cheap multigrades in old engine applications without a qualm - far better than the oils they were constructed to survive!

IMHO, SAE 50 will be too thick unless the engine is working hard on a summer's day.

Regards,

J. Kim Siddorn,