which oil do you all use and how much? I am a powerstroke owner and my brothers duramax needs an oil change bad. I was going to change it for him before he heads back to his house (10 hr drive) , just wanted to see which oil is the most popular and how much
Been running synthetics since the early 70's. The only supplier of 15W-40 in full synthetic is Amsoil. I like it but I get tired of paying just under 10 bucks a qt. for it. All other brands of full syn. are 5W-40. IMHO it makes no difference as long as it's CJ or CL rated. I change it every 5-6K or when the DIC says the oil life is 5% or less.
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