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    Oil filter change at 10k miles (every other change) ?

    2003 F250 7.3 @ 177k miles No towing, light use. Live in Louisiana. Been using T4 Rotella & FL1995/a Motorcraft filter every 5k miles. During the recent happening I used Walmart SuperTech a couple of times and even mixed with T4 when I couldn’t find T4. Had a NAPA oil test done and everything...
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    03 F250 Super Duty 7.3L D oil change interval question

    170K miles. Was a light tow'r from 0-40K, now just a light duty chore truck. Now that I bring my rig home it doesn't see highway miles either. Was using Rotella until couldn't find it. Now using Super Tech 15w40 HD Diesel w/ Motorcraft filter. Was changing every 3000m but have seen some talk...
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    Switching to 10w30 synthetic? Mixing 10w30 syn w/ 15w40?

    Have an oil change coming up. Recently came into a buttload of Delvac syn 10w30 (see below) via a foreclosure sale. Been running the Walmart Super tech 15w40 since 150k (0-150k = Rotella 15w40). Would like to eventually transition to the Delvac if it’s not a problem but still have a 2 gal jug...
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