Hi,
I am pondering using a 5W - 40 in my 99 24 valve engine. The oil in question is Duron Synthetic made by Petro Canada. According to the oil it meets CH-4, CF/SL and SJ categories and exceeds CG-4, CF-4, CE, CD/**, and SG as former categories. The oil has a sulphated ash content of 1. 37...