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On 18 Nov 2004 at 16:41, Toby Erkson wrote: > I completely disagree with a couple of your points, Jim, based upon what > I've researched about synthetics. Comments below. > Jim Adney wrote:... > > >The dino oil itself does not break down and can be re-refined and reused. > Huh? Dino oil certainly DOES break down. And synthetic can be > recycled, too. Everything I've read states quite clearly that the petroleum base does not break down in use. It's only the additive package that suffers. The additive package is VERY important, however. Recycling just removes the dirt, and spent additives and then adds back the necessary additives. I'm no expert on this by any means, but my impression is that synthetics have the advantage of not needing some of the additives. In other words, they can do the necessary work without help, which is certainly better. I've not heard anything about recycling synthetics. Does it need to be collected separately or can it just be recycled with regular dino oil? > >The advantages of synthetic oil completely disappear if you don't have a full > >flow engine oil filter... > > > Not true because it still provides better lubrication than conventional > oil...which is why one cannot break-in an engine with synthetic, > conventional must be used first. After the break-in the synthetic oil > can be used. I think I've heard this both ways. It's certainly true that engines a long time ago were expected to wear quite a bit at first, but my impression lately is that finishing techniques in modern engine machining has greatly reduced this. > I recorded an averaged 5hp GAIN by switching my engine and tranny oil to > synthetic in my VW Jetta (NOTE: The Mk.III trannys come stock > w/synthetic but I refreshed it during my testing). Maybe the synthetics have an advantage in film strength, which allows them to be used in lighter viscosities. Did you test different oils with the same viscosities? How did you measure your HP increase? What do you mean by "average" when you just have a single sample? How many miles were on your Jetta when you did your testing? I'm asking because you would expect some increase just from whatever breakin occurred in a new engine. I'm willing to be convinced, but I'd really like to understand what you did to come to your conclusions. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~