gmv@petfe.UUCP (George Verbosh) (09/27/84)
<> Here's one for all you auto-netters that have been playing with oily questions for the past few weeks: What does the 'W' stand for in 5W40, 10W30 etc.? (Maybe Weight?) If this looks like a stupid question, then it is. (Wouldn't be the first time I did one of those....) -------- George M. Verbosh, Perkin-Elmer, 106 Apple St., Tinton Falls NJ, 07724 ....{vax135, pesnta}!petsd!petfe!gmv
gvcormack@watdaisy.UUCP (Gordon V. Cormack) (10/05/84)
The W in 10W-30 stans for "winter"; they run 2 viscosity tests: the 10 indicates that the oil behaves like 10 in winter and like 30 in summer. While I am at it, the following point has not been made succinctly enough: ALL oils get thinner when hot and thicker when cold. Multigrade oils just do it less so. I will also put in my two-bits' worth on Mobil 1: In about 1977 I put Mobil 1 in a 76 Honda Civic and got atrocious oil mileage (< 100 miles/quart). The consumption went back to normal (>2000 miles/quart) with real oil.