- Jan 29, 2014
- Reaction score
- Montgomery, NY, USA
- VCDS Serial number
Thinking out loud here: I wonder if part of the problem is the very light-weight oils, and/or combined with the very long (10,000 miles!) oil change intervals that VW specifies these days?
A reciprocating piston engine is not a sewing machine, yet they call for ever-thinner oils. I had the oil changed on a 2018 Tiguan at the dealer about a month ago and they used 0w20! I believe the primary reason they do this is so they can get incrementally better fuel economy numbers out of the EPA tests.
I made some very compelling tests over last 20 years and I described them in Marin's oil thread I thought?
The oil is not the only problem, it is a design problem too, right?
Fuel pumps being given access to leak internally and blow by gasses or inadequate valve/chain guide friction surfaces being sealed, scraped or bathed in oil by gallery channels & being permitted to mix as a result of thin oil already & to in spirit prevent turbo charger coking the sump, are what manifest this and the OEM's are fully aware of it?
Not just thin oil for friction caused by MPG loss.
When observation of 1.8T or early TDI came in, two things failed, heads/cams due to adjuster choice location and turbo chargers. Most low ends were still good even though coking was heavy and even with a plugged sump screen.
Bifurcation of the sump from fuel pumps and turbo chargers makes these engines last much longer on slightly heavier non synthetic oil & due to adhesion quality of traditional type oil viscosities.