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Re: what is the oil i should use
I have an '03 5.9L 4x4 with 85k miles and use Mobil1 full synthetic 10w 30. I've used stnthetics in everything I've ever used with no problems ever in regards to oil issues. Mobil 1 is the most expensive, I just use it cause I trust it. There are cheaper brands that provide the same protection. For me it's just a matter of choice.
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