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On 10 Aug 2002, at 22:53, Shad Laws wrote: > > > BTW, who can tell use what the W in 10W-30 stands for? > > > > IRC, this is weight, they don't add it to the 30 because it is implied. > > No, it means winter. It means the oil is "suitable for winter use." You're right, it stands for Winter. All it means is that the viscosity, when measured at the "winter" temperature, which I THINK is 0C, fits in the bracket which has been agreed to be labeled as a 10 (or actually 10W.) The other number, the non-winter one, is a measure of the viscosity at a higher temp, which I THINK is 100C. It is perhaps interesting to know that the 2 viscosity scales are NOT the same. In other words a 10W oil measured at the winter temp does NOT have the same viscosity as a 10 oil measured at the "summer" temp. BTW, I was VERY glad to read Shad's debunking of the "synthetic doesn't remove heat well" myth. I don't have any way of knowing the truth on this, but I just couldn't understand how that myth could possibly be true. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/