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sad story here: before i knew any better, I added a quart of Castrol Syntec to my
5000tq when it was down a quart. not knowing that the chemicals in synthetic oil
actively repel those of standard oil, I drove on. One mile later the pressure in
the system blew up an oil return line on the turbocharger. Oh, sometimes you learn
things the hard way.
> With the risk of getting some nasty messages from some of you, not so
> "distinguished" listers, let me bring some important points to your attention:
> Std. oils (none synthetic) will not leave any more deposits in the engine
> than synthetic oils, providing you change your oil under 5K miles and
> fully warm up the engine (oil temp.), flushing the engine every second oil
> change is a bit of an overkill, not quite sure what it does to seals life?
> (maybe extreme cases?...), if i remember correctly the additive package on
> the std. oil and synthetics are very similar.....
> Please, do away with nasty messages, if anybody want's to comment, it
> should be to the point and not personal.......even about "synthetic oils"
> At 11:58 PM 12/30/97 +0000, you wrote:
> >Sargent Schutt wrote:
> >> John Graham wrote:
> >> > > It would be interesting to compare your engine oil consumption over the
> >> > > next few months with your pre-synth days. I made exactly the same
> >> > > changes as you on my 91 200q about 5k miles after I bought it, and
> >> > > that with the change to synth my car started burning oil (1/2 qt per 4k
> >> > > miles). Since then I've switched to dyno engine oil (20/50) and have
> >> > > noticed less oil consumption. This all due to the detergent effects of
> >> > > the synth engine oil.
> >> > But were you useing a 20W50 synthetic?
> >> Yes.
> >> > >
> >> > > In the tranny, I originally put in Mobil 1
> >> > Bad move. Mobil 1 is a GL-5, even Mobil says don't use it in a
> >> > Quattro.
> >> Hmm, the Audi tech said the mobil-1 tranny oil he put in was the
> >> weight. Sure was dirty when I changed it 20k miles later, though (to the
> >> Redline).
> >Mobil-1 gear oil is GL-5 and is corrosive in a Quattro tranny.
> >Redline MT-90 is a GL-4 and is ok.
> >> > > ( at143k miles, made an
> >> > > improvement), then recently changed to Redline - BIG improvement in
> >> > > shifting with the Redline. I highly recommend it.
> >> > >
> >> > > Anyway, keep me posted (the list) as to the change in oil consumption
> >> > > levels (if any) you see in the coming month or so.
> >> > >
> >> > Make sure it's the same grade oil like 20W50 dyno to 20W50 synthetic.
> >> Why should it matter as long as the weight is appropriate to the outdoor
> >> temperature? That would seem to be the important thing. Regardless, the
> >> detergents in the synth clean out the buildup that has become part of the
> >> motor (after high, 100k + miles), particularly after 140+k miles when I
> >> switched. (currently 167k miles), That's is what I'm after here. More proof
> >> of that phenomenom - I have heard about it, I experienced it; How many more
> >> out there?
> >Because synthetic oils don't act the same as reg. oil under pressure.
> >A 5W30 synthetic may look like a 5W40 reg. to hot runing engine.
> >You don't need more proof of the phenomenom because it's true.
> >But it's the why. Just how much gunk doe's one let build up in the engine?
> >I my old days before synthetics, I use an engine flush every other oil
> >Because you don't want oil pump by pass valve to get stuck.:-(
> >1990 CQ