Car mileage 180,000 km and piston rings were changed, head gasket and valve seals replaced, engine oil chamber opened and then siliconed. Then I put 20W-50 engine oil and engine ran a little hard when starting, but is ok once started. Now I changed the engine oil after 3000 Km, and my mechanic told me to put a thinner oil, 10W-40. Is thinner oil will be better? Or should I use the same thick engine oil of 20W-50? Please comment.
Monday, May 14th, 2012 AT 8:26 PM