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    Difference between Delvac 1 and Mobil 1 truck and suv

    Hi all, I was at a farm show yesterday and talked to a mobil rep there and told him it is hard to find delvac 1 for my dodge cummins. He told me that subject came up recently and his research said that delvac 1 and mobil 1 truck and suv speced out pretty much identical. That would be great if I...
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    Prestone extended life in dodge cummins?

    Hi, it is time to change coolant in my dodge cummins and would like to know if I should use this or what I should use. TIA
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    rotella t syn. 5w-40 for dodge cummins

    I have a 99 dodge cummins with the 24 valve motor. The owners manual says to use 10w-30 from 0 to 30 degrees f. or 5w-30 syn. from -10 to 20. I found rotella t syn. 5w-40 and was wondering if I could use that? Whats the difference between 5 30 and 5 40? I would like an oil that will work down to...
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    Higher octane make a difference?

    I have heard conflicting on this, some say more octane makes more power. Others including a website from the goverment says no benifit from higher octane than your owners manual says. Some say it burns cooler while others say hotter, can anyone clear this up? Thanx.
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