[Vwdiesel] Bad experience on TDI club

[Patrick Dolan]

What value are you getting reported that makes you believe you need to change oil at 4k??????

About the only thing a VVT system can do to "stress" an oil is squirt it at high pressure through a small orifice (hydraulic consideration), and, if your oil is a dino with a lot of VI (sorry....Viscostiy Improver = long chain polymer easily damaged in hydraulic applications) you could see the VI (sorry.....here I go again.....Viscosity INDEX) or viscosity itself dropping out of grade.  If you are using a "high quality synthetic" there shouldn't BE much (sometimes any) VI additive, or if it has, something cyclic rather than linnear (referring to configuration of carbon).

Really curious.

Pat

----- Original Message -----
From: mikitka <mikitka at embarqmail.com>
Date: Saturday, April 4, 2009 1:52 pm
Subject: Re: [Vwdiesel] Bad experience on TDI club

> One thing a TDI owner might do if their engine is in question on 
> this. (Yes
> it is an added cost but might be worth doing.) That is having your oil
> analyzed. That might help in catching any sever wear issues at 
> hand.  
> 
> Case in point. Our 08 Acadia with the new 3.6L VVT engine is 
> killing the
> engine oil. I can't go past 4k miles on an oil change, even with 
> running a
> high quality synthetic.  There seems to be an issue with the 
> engine design
> and since the oil system runs the variable valve timing it is 
> putting extra
> strain on the oil.  Maybe something kind of similar in the TDI's?
> Nick
> 
> 
> Since so many have asked:
> There "appears" to be a problem with the PD (unit injector) TDI 
> made  
> from 04-07.  Some, and no one can seem to quantify how many, of 
> these  
> engines are suffering from premature failure of the cam, cam 
> bearings,  
> and lifters.  Actually only about 1/2 of them go bad but that is a 
> 
> different story.  The cause may be:  poor quality of the metal in 
> the  
> cam (manufacturing flaw), asymmetrical pressure on the cam and 
> lifters  
> due to the lobes on the cam that fire the injectors (design flaw), 
> or  
> possibly use of the improper oil by the owner or even by VW  
> dealerships (stupidity flaw)  (VW recommends oil that meets a 
> 505.01  
> standard and you won't believe the arguments over this!),  Now, I  
> personally have no problems yet but when I get time I do intend to 
> 
> pull the valve cover and have a look see.  But, to save time, I 
> have  
> listed below the 3 questions I asked on the TDI Club forum and the 
> 
> answer I finally got.  The answers are in the form of posts on the 
> 
> forum so simply click on them to find out.  BTW I think we got two 
> 
> different posts mixed up, I don't find my Jetta "gutless and low  
> powered, just the opposite, especially since it is chipped to 
> produce  
> 125 hp.  Hayden
> 
> 
> 1) What symptoms are exhibited by a PD engine, during normal  
> operation, that would lead one to believe that the excessive wear  
> problem has occurred?
> http://forums.tdiclub.com/showpost.php?p=2414784&postcount=72
> 
> 2) If I remove the valve cover, what can I expect to see if the  
> excessive cam wear has occurred?
> http://forums.tdiclub.com/showpost.php?p=2313139&postcount=1
> 
> 3) What parts are necessary for repair and who can supply those parts?
> http://forums.tdiclub.com/showpost.php?p=1998933&postcount=2
> 
> 
> Hope this may help.
> 
> 
> " Those who are willing to sacrifice Liberty for Security, deserve 
> 
> neither Liberty nor Security."  Ben Franklin
> 
> Vwdiesel at vwfans.com
> http://www.audifans.com/mailman/listinfo/vwdiesel
> 
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