Hi

Recently I ran the smog check and the tester told me the car looks like it is new. However, I noticed my exhaust are dark even my bumper is getting dark... I took the freeway almost everyday in a total of 70 miles .. my car is 92k miles and every two weeks I need to replace a quarter of oil at least.

I do not have leakage.. I had one my I changed the gasket by myself and that's fine now..

The question is... this oil reduction is my pistols and valves ? if yes, how the smog test passed without problems?

Many thanks