if you insist on using 5w-20 would say Amsoil is the best route to go, they make some great oil products, but they are also very expensive. Ive been using 5w-30 Castrol GTX in place of the 5w-20 ,pesonally I dont like the idea of a 5w-20 regular oil. I hope to switch to Castrol semi-synthetic blend 5w-30 after a few more miles, I think its the best oil for the money from all the different oils that I have tried in the past.
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