Arudge
Senior Member
- Joined
- Jun 14, 2016
- Messages
- 753
- Reaction score
- 246
- Location
- Cradley Heath
- Your Mercedes
- CLK200 2000 Kompressor
This is a drawing from a 190. I know it's not a M275 but it is Mercedes and Mercedes don't tend to change their core principles much, which is why i like them.
A is the feed from the oil pump. You'll quickly notice that oil can go one of two directions, i can carry on up to the filter or it can double back through items 4 & 6, this is the bypass valve and allows unfiltered oil into the main gallery, marked B.
As the oil thins as it gets warmer more goes through the filter and less through the bypass. But as the filter becomes blocked, more goes through the bypass again. Dirty oil is better than no oil at oil.