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On 18 Nov 2004 at 0:23, David V.N. wrote: > From: "Jim Adney" <jadney@vwtype3.org> > > On 17 Nov 2004 at 20:21, C.Rochambeau wrote: > > > >> > Change the oil to a synthetic. > > > I also don't know that there is any real advantage to synthetic in this > > application. > I can agree with that.It certainly didn't appear to make any difference in > engine oil. Or so it was with my little experiment with it. It is my understanding that in long term tests the synthetic engine oil has demonstrably better properties due to the fact that its additives do not break down with high temps and shear the same as dino oil additives do. It's not surprising that most of us can't see these effects because they only show up in the very long term. The dino oil itself does not break down and can be re-refined and reused. The advantages of synthetic oil completely disappear if you don't have a full flow engine oil filter. Unless you have a full flow filter, you MUST change your oil regularly just to get rid of the suspended wear particles in there, so the longevity of the synthetics becomes irrelevant. In a manual transmission there is almost no heat stress, compared to an engine, and most of the shear has been replaced by rolling element bearings (ball and roller bearings) so I don't see these advantages being important there. There's probably an advantage to switching to a 75W-90 over a 80W-90 or just SAE 90 gear oil, but that would depend on your climate. I was probably wrong in suggesting 80W-90, just because that was based on very old experience. It's quite possible that 75W-90 gear oils are the standard today. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~