Check out this site - http://TheMotorOilSite.com Your understanding is a common one and not quite accurate. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote: > > > Moreover, the oil itself is whatever weight precedes the "W". For > example, 10Wxx oil is only 10 weight, that's all. Miracle additives > are supposed to make the oil act like the heavier number that follows > the "W" after it heats up. I don't trust them. Too often I've seen > multi viscosity oil come out as two separate products during an oil > change: thin watery stuff followed by thick gloppy stuff. I'm assuming > that's the oil separating from its miracle additives. I've also > encountered valve train noise in my AMC with multi viscosity oil. > That's why I use straight 30 weight only (temperatures where I live > rarely drop below freezing). Multi viscosity oil makes no sense for > vehicles in Florida or California either. > > Bill Robertson > #5939 > > >--- In dmcnews@xxxxxxxxxxxxxxx, M5E <nitrousgarageworks@xxxx> wrote: > > > > The simplest way to explain it is: Think of the W > > rating in oil as "winter". How the oil flows at zero, > > or sub-zero temperatures. As the oil is tested it's > > assigned a "value" by the petoleum product > > manufacturer's association. Generally the lower the > > first W value, the faster it flows in cold temp.s But > > realistically zero weight oil, is an EXTREMELY light > > grade of oil, and won't survive long in use. It's > > properties degrade quickly, To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/