KEN - My truck has 85W-140 synthetic in the rear axle, WAY too good for the little Kohler. Everything else except the frt diff is syn. ATF even in the manual trans. Not sure what's in the frt diff. The Factory put that in.
That old pre-emmissions 250 Chevy six would have RUN on 90W. They were a pretty durable old engine. Not a big power house but reliable. Mom had a '65 Impala with the 250 & "Power-Glide" A/T. Terminal velocity was about 75 mph, 80 with a tail wind downhill.
I do have a gallon or two of 85W-140 dino oil. It won't even pour out of the jugs around 20-30 deg. F.
That old pre-emmissions 250 Chevy six would have RUN on 90W. They were a pretty durable old engine. Not a big power house but reliable. Mom had a '65 Impala with the 250 & "Power-Glide" A/T. Terminal velocity was about 75 mph, 80 with a tail wind downhill.
I do have a gallon or two of 85W-140 dino oil. It won't even pour out of the jugs around 20-30 deg. F.