Valvoline Premium Blue

[Signature620]

As far as I can see - Any name branded oil that meets the manufacturers specification that your engine doesnt burn is perfectly fine. As stated by others here - You will really and truly struggle to find any legitimate case where a significant increase in wear or a component failure was caused by an oil brand. It is always a matter of manufacturing defects, abuse, usual wear or lack of maintenance.

For an ISX, use whichever CJ4 oil you can easily obtain for a reasonable price.

I put Premium Blue 8600 in most of my customer's trucks because many request it and I get it at a fantastic discount.