drypowder
Les Deplorables
When you get over 100k miles, is it expected that the oil will be pretty dark after 5k miles? If not 100k, what's the mileage where dark oil is the norm, and light oil is the exception 150k, 200k?
Also, is dark oil in a vehicle with good compression (tested using compression gauge) anything to worry about, or can you still expect lots of life out of the engine (with regular oil/filter changes of course)?
Speaking of compression testing, I gather this isn't part of the usual pre-purchase inspection. Seems like checking compression is prudent when buying a used vehicle - am I wrong here? Any ballpark estimate of how much a shop would charge to add a compression test to a PPI (let's assume inline 4 cylinder engine, as I know some larger engines require differing amounts of work to access spark plugs)?
Also, is dark oil in a vehicle with good compression (tested using compression gauge) anything to worry about, or can you still expect lots of life out of the engine (with regular oil/filter changes of course)?
Speaking of compression testing, I gather this isn't part of the usual pre-purchase inspection. Seems like checking compression is prudent when buying a used vehicle - am I wrong here? Any ballpark estimate of how much a shop would charge to add a compression test to a PPI (let's assume inline 4 cylinder engine, as I know some larger engines require differing amounts of work to access spark plugs)?
Last edited: