11-25-12, 04:01 PM
I'm using synthetic royal purple oil in all my vehicles. Based on the temperature chart in the manual and the temperatures I experience in California, it says to use 10w-40. I have two other newer cars that use 5w-30 and that's what is available right now. Will I get any benefit out of purchasing new, thicker oil? Or just use the 5w-30? The oil in there right now is clean and can wait another week for more to come in the mail, should I go ahead and put 5w-30 in there or wait and order another viscosity?