- Apr 18, 2001
- Southeast Texas
- 2004 Passat Wagon (chainless + 5 MT + GDE tune)
^^^ Ok, one option. Another one, run this two step program:Clean oil means less soot in oil and less carbon, easier on the seals.
Fun fact, we bought back a car we sold. We did an oil change and then 30 mins later did another as new oil was black. Oil can only carry so many contaminants, a severely neglected engine can have a lot of crud settle from the oil. A bypass filter fixes that.
Then, for a CR TDI, run a one or more short oil change intervals (OCI), like 5,000 miles using a 507 certified engine oil.