A good lesson in oil viscosities etc.

budgel, Jul 30, 6:53am

marte, Jul 30, 10:49pm
Thanks, that's cleared up the 'Oils thicker when it's hot' statement that I have been wondering about a lot lately.

It isn't.

And, go higher on the upper number.

gph1961, Jul 31, 1:16am
good watch

fishb8, Jul 31, 1:31am
👍

orphic1, Jul 31, 3:10am
Informative, thanks

bumfacingdown, Dec 15, 8:08am
"And, go higher on the upper number"
Why?
Would the manufacturer not know what grade was best?