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  1. M

    Oil Recommendation

    The car is an 2012 Hyundai Santa Fe, 4 cyl eng. The owners manual says I have 3 weight choices in the Florida climate-- 5w20,5w30 or 10w30. I'm more interested in engine protection than a little fuel mileage. The owners manual says to use-- API Service SM and ILSAC GF-4 or above. The manual...
  2. M

    Detroit Diesel high silicon?

    I'm trying to help my brother out with his truck. He get a UOL with every OCI. They keep telling him that his silicon is high. We both live in Florida. I told him to check his air filter(Donaldson). He said it looked like it was sealing ok. He had an in-frame o-haul about 80,000 miles ago. Could...
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