£20 diagnostic!
Used this product to stop exhaust smoking when warm. Was a bit of a trial as i wasnt sure whether it was a fuel or oil problem i had. Within hours the smoke had stopped completely. It only lasted about a week though. Nevertheless, it solved my fault. I changed the 5-20 oil for 15-40 and happy days. Prob worn rings or valve seals. Car runs perfect now so it was a good £20 spent to diagnose! Think old desiel engines need thicker oil as 5-20 is like water and gets through seals easier
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