98.5 30V with 205k miles/Auto Transmission
05-29-2008, 08:03 AM
#22
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well, not meant as a blanket -- sure there are NA engines where full-syn is spec'ed.
However, this is the B5 A4 forum, and full-syn is not spec'ed for any of the NA engines in the B5 A4 line.
Just like 95% of the other NA engines produced.
Just like 95% of the other NA engines produced.
05-29-2008, 08:06 AM
#23
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Second. ME with concentration in polymers.
Synthetic oil does have better stats than dino, but the vast majority of applications do not benefit from those properties.
This discussion is almost as played out on this forum as whether or not the plane will take off.
This discussion is almost as played out on this forum as whether or not the plane will take off.
05-29-2008, 02:48 PM
#26
1) Define "synthetic". 2) Explain how running oil 2x longer to justify 2x the price = better result.
So that's what, 5k on synth verses 2500 on SM dino or more likely 5k on dino verses 10k on synth. I've seen decent 10k UOAs on Havoline dino. I'll take the shorter oci with $2 SM spec oil that is basicly no different than stuff labeled "synth" for $6+ and change it 2-3 more often. Dino = lower wear and less deposits when changed at proper oci. Mobil Clean 5000 would be a good example, 5q jug = $9. It's a solvent dewaxed G-III oil with state of the art Borate ester/Antimony/Overbase Calcium additive pack. Even Pennzoil Yellow bottle is G-II+ with the latest Infinium/Afton additive package.<ul><li><a href="http://www.aftonchemical.com/Regions/Europe-Middle+East-Africa/Knowledge+Center/Introduction+to+Lubricants/Additive+Compounds.htm">http://www.aftonchemical.com/Regions/Europe-Middle+East-Africa/Knowledge+Center/Introduction+to+Lubric
05-29-2008, 03:20 PM
#27
Allow me to dispell the "polymer viscosity index improvers turning into sludge myth"...
I can do it in a pic...
(server is too busy for the pic)
V6 Audi 122k of 10k intervals on Syntec 5w-50, an oil supposedly "loaded" with polymeric VIIs. Rumour and myth lags 5-10-20 or more years behind reality. Reality being; modern VIIs don't shear into sludge.
Another oft-cited myth is how "nothing" compares to "pure" true synthetic PAO G-IV base (especially G-III hydroprocessed petrol base). Well, reading up on Chevron's studies their G-III base certianly equals or betters PAO base oils in traditional prameters like pour point and anti-oxydization. Add to that the fact that a MIX of base oils provides the best wear protection and you see how far myth lags behind fact. fwiw, I don't feel like citing sources for now.
(server is too busy for the pic)
V6 Audi 122k of 10k intervals on Syntec 5w-50, an oil supposedly "loaded" with polymeric VIIs. Rumour and myth lags 5-10-20 or more years behind reality. Reality being; modern VIIs don't shear into sludge.
Another oft-cited myth is how "nothing" compares to "pure" true synthetic PAO G-IV base (especially G-III hydroprocessed petrol base). Well, reading up on Chevron's studies their G-III base certianly equals or betters PAO base oils in traditional prameters like pour point and anti-oxydization. Add to that the fact that a MIX of base oils provides the best wear protection and you see how far myth lags behind fact. fwiw, I don't feel like citing sources for now.
05-29-2008, 05:23 PM
#29
Oil type/brand and longevity have not correlated in my cars.
I buy the cheapest brand, change every 7.5-10k and have never had an engine problem on 6 Audis.
Contrary to conventional wisdom, Audis handle neglect pretty well.
Contrary to conventional wisdom, Audis handle neglect pretty well.
