It seems that researching this issue is not possible……as there are no answers to date
Calls to the VW national customer line was like talking to a rock…..with the mantra being repeated again and again: “ You must contact your local dealer and ask the trained VW techs about this problem. We rely on them for information regarding such issues.” She also pled dumb time and again to my question of getting me a VW tech center to call…insinuating she was aware of no such place.
A couple days ago I decided to push a little further. I called my local dealer (80 miles away) and inquired their knowledge of the problem They had no clue of even what I was talking about. The service manager said he would try to dig into this for me, but this has proved futile in the past on other Passat ‘gremlin’ issues. Bottom line...they have done zero oil bolt repairs. I guess that's a good thing.
I then called a few larger VW shops in WI and Il. Between the three I called, there were 7 done over the last 2 years.
One said their experience shows 25K-35K miles is the trouble area. I asked about being proactive and fixing it on my nickel. They recommended not as in their opinion it is not to be expected of all vehicles. The job is a 8-10 hour repair per this service manager.
Another garage was a little more thorough…He took my VIN (My build date was 1/06). and related (right or wrong) that of the couple they’ve done……the build date affected was between 8/05-11//05. The mileage less than 15K. He agreed with the garage above that the proactive approach not be taken. We know from this thread that there is a smattering of various mileages affected.
There was a commonality between all 3 places I called: They felt that a MIL would come on and/or a ticking be heard before catastrophic failure occurred. (I know that does not appear to be the case for all in this thread) Also…when I suggested the cause of the failure might have been improper torquing and/or lack of Loctite………they agreed this was likely the culprit and not an actual bolt failure. The bolt backing out is what caused the problem according to all 3 places I called.
My main question…yet unanswered is: How many 3.6L engines were made and what is the % failure rate. If they made 25K engines and 100 failed, I would play those odds any day. VW appears to be playing those odds as well, fixing the problem on a unit by unit basis.
Am I correct in assuming the powertrain warranty of 5/60K miles covers this issue?
Everyone with a 3.6 reading this thread who has had no issue yet should be lambasting a few dealers with these same questions and reporting back here. Perhaps we can piece meal this thing together and identity some specific VIN lots. I am starting to think that a single engine manufacture employee (maybe more than one) was negligent in the assembly of the oil pump. Unless someone can provide a schematic of the affected oil pump bolt, I find it almost impossible to believe that a properly torqued/Loctited bolt holding part of an oil pump together would EVER fail. I could take that a step further and say that perhaps the hole this bolt mates up with in the block? was drilled a C hair too large and therefore the bolt can’t be cinched up correctly to prevent it from eventually backing out. This would explain a slightly larger bolt being installed as part of the fix.