Re: Pair of Martin 75s

[amuller]

quote Buccaneer:

I was thinking the “W” meant weight.
Either way, not a good idea to put 40 anything
in your car in January in Minnesota. 😮

I think the W is often taken that way, and oil is often sold as "40W."

But if you look at the specs W clearly means "winter grade." Thus 10W40, etc. I know I have never seen a real 40W oil, and it doesn’t appear in the tables of SAE oil specs I’ve looked at, such as https://wiki.anton-paar.com/en/sae-viscosity-grades.

So I incline to think that "40W" is just a marketing term meaning "fourty weight" and the oil we want for the Martins is just plain SAE40 single-viscosity oil, which should not be hard to get.

(Note that in aircraft engine oils, a W in front of the number means "ashless dispersant," not "winter" and has nothing to do with viscosity.)

Alan