Thank you very much all of you for detailed information. So I understood that as the current fuels are unleaded not like in the past , exhaust will never be grey or rust color inside. As a result, car is running rich at cold start and does not have catalytic converter, until car warms up eyes burning(if I come very close to exhaust pipes) and heavy smell is normal?


By the way, there is a lead additive for patrol in markets, brand called liqui moly. Have you ever used? Or recommend to use?

Thank you very much for all again for detailed information


Kutluhan