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On Mon, 2005-08-22 at 09:26, Schlegel, Richard wrote: > What is the use of using synthetic oil if you change it so often? One of > the selling points of synthetic is it doesn't break down as fast as > regular oil. So why change it as often? To me this is a waste of money > to change it so often especially if you run an extra filter. > > 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. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~