Factory recommended oil change interval is 10,000 miles. This car has a bypass filter installed and is using Amsoil HDD diesel oil...a very robust oil.

He ran the oil 20,868 miles, not 40k as stated on the report...that is a typo. The owner of the vehicle was actually told by his Amsoil dealer that he could run the oil 50K miles with the bypass. He decided to get an analysis done at 20K to play it safe. Good thing! This guy was eating his engine alive!

Understand that these VW TDI engines are much easier on oil than our Mercedes IDI engines. If Amsoil with a bypass filter could not go 20k in this TDI, do you really think any oil will safely go 20k (or more) in your Benz?

Don't try it without working your way up via analysis.

Tim

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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss)

1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss)