I have been using Castrol Syntec in my wifes KIA for over 60k miles, the mfgr requires 7500 mile changes but being old school I change the filter every 2500 and the
oil at 7500 and it runs like it did when new and the
oil isn't really very dirty when I change it.
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1963 Mercury Monterey 460+ .060 .//Cobra clone, Scratch build frame /302/ T-5 WC / 3.00-9in/FFR mkll body (Broken but repairable) /91 Lincoln Wire Wheels
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N.S.M.C Charter/Life Member// Die Hard Blue Oval Nut
The finish is better than the beginning. Ecc7:8