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OH OH I KNOW!!! The S stands for Spark ignition...am I right? Amber 65 and 69 SBs On 8/22/05, Jim Adney <jadney@vwtype3.org> wrote: > On 22 Aug 2005 at 10:27, Russ Wolfe wrote: > > > The synthetic are more temperature stable. They don't thin out in the > > heat, and don't break down into varnish with the high heat of our engine > > oils. Oil temperatures in our air cooled engines can go as high as > > 260-280F. Dino oils completely break down at those temperatures. > > When I first started working for VW back in the '60's VW wanted the oil > > changed every 1500 miles, not 3000, just for that reason. > > But modern water cooled cars now run with MUCH hotter oil temps than they used > to, so modern oils have changed immensely to keep up. What are we up to now in > the API ratings, SG/SH? Or has it gone higher? > > ISTR that the API ratings only started in about 1970 or so, and of course they > started out as SA/SB. > > Our VWs were fine with dino straight weight oils in the 60s. The only problem > came with the multi-vis additives which are the parts which break down. Up thru > the 70s VW continued to recommend straight weight oils, but even then the API > rating was just SC/SD. Things are so much better now that my impression is that > we can now get away with the multi-vis oils. > > If you don't trust the modern multi-vis oils, why not just stick to straight > weight? Or are those impossible to find today? I'll bet one can still buy them > at places like Farm & Fleet or Sears. One might wonder about the quality, but > I'd believe the API rating, if it's there. > > Bonus questions: Who knows what the S in SG/SH stands for? What's the other > option (instead of S) and what does IT stand for? > > -- > Jim Adney > jadney@vwtype3.org > Madison, WI 53711-3054 > USA > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > -- Thanks! Amber "You can discover more about a person in an hour of play than in a year of conversation." --- Plato.