German Castrol 0w30, 5000 miles '02 VW Passat 1.8T
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Yes, I agree. I don't think there is a single cause. Combine the turbo with the small sump, with the turbo lines being routed too close to the exhaust and there is virtually no margin for error. Introduce any sort of shock into the system such as incorrect oil, incorrect OCI, city driving, less than optimally tuned engine, and that's all she wrote.
One cause is that the combustion is an acid producer and the with smaller sump size there is less "base" (oil) to neutralize it. Others here explained everything well, I think.
That deos seem very high. My wife's car 02 Passat 1.8T, using the same oil (07 GC Gold) used no oil over the course of 4500 miles. At least not enought to register on the dipstick.
Mike
My 02 Passat 1.8T with 90K has had nothing but Full synthetic since day 1. Most of it was with a 5W-40. I ran some modest extended drains, 6500 or so, but I stuck with the 5K recommended drain interval for the most part. My PCV system was completely clogged at 75K and was painstakingly replaced. I then followed up with two Auto-rx treatments. The bottom line is that I would never put a conventional motor oil in this engine. I now monitor the PCV system at every oil change.
My experience (ordeal) was very similar to Steve RI's for those that don't already know.
gnosis, I have the tranverse 1.8T, from the GTI, and I check the hose that comes off the valve cover nipple as well as the one that comes up from "below" and ventures toward the intake hose. I'm not sure how different yours is. When my PCV system was clogged, these hoses had buildup that's obvious as soon as it's seen. The valve cover nipple had it too...looked like dried black mud in there.
gnosis, I have the tranverse 1.8T, from the GTI, and I check the hose that comes off the valve cover nipple as well as the one that comes up from "below" and ventures toward the intake hose. I'm not sure how different yours is. When my PCV system was clogged, these hoses had buildup that's obvious as soon as it's seen. The valve cover nipple had it too...looked like dried black mud in there.
Please let us know how it looks.
Steve, what has been your oil choice and OCI since you've had your PCV system replaced?
My 1.8L was starting to show signs of deposits too before I traded it in. Lots of brown coating inside the oil fill hole and my last UOA suggested the beginning stages of deposit formation. That was at 70K miles. Used synthetic for most of the car's life.
I know you posted a link to your UOA over at PassatWorld, that's probably the best place to research your PCV system. I'm planning on tearing into mine come springtime; I should have a house and a garage again by then. Very curious as to what I'll find.
Lexus makes a street sweeper?
Certainly not. No one on a street sweepers salary can afford that is the awesomeness that is Lexus
For the record, the girly VW is my wife's car
For monitoring, I just pull the hose that leads up from the actual PCV valve on this engine. Checking the valve is a royal PITA, but this hose was clogged solid with sludge. I figure if this house starts to look nasty again, then I'll be on top of the situation much sooner.
I used Rotella 5W-40 for the 10K I was using Auto-RX. I've been using M1 0W-40 since, but I'd use any of the 502 approved oils. I found a decent deal on the Mobil1, so I went with that. I also use the newer oversize Mann filters. 4K is my max OCI for now, and at 100k I will have a UOA done to see how everything is doing.
For monitoring, I just pull the hose that leads up from the actual PCV valve on this engine. Checking the valve is a royal PITA, but this hose was clogged solid with sludge. I figure if this house starts to look nasty again, then I'll be on top of the situation much sooner.
I used Rotella 5W-40 for the 10K I was using Auto-RX. I've been using M1 0W-40 since, but I'd use any of the 502 approved oils. I found a decent deal on the Mobil1, so I went with that. I also use the newer oversize Mann filters. 4K is my max OCI for now, and at 100k I will have a UOA done to see how everything is doing.
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