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Anyone here run Mobil 1 15w-50 in the summer?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Piranha300, Mar 21, 2002.

  1. Piranha300

    Piranha300 Registered Member

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    Location:
    Nebraska
    The manual says you can run 15w-40 when its hot outside, but unfortunatly mobil1 doesnt make that weight. Any advice would be great.
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    I run 20w50 in all my vehicles, except for the Firebird, it gets straight 50w
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    I just put 20W-50 in my Jimmy before I left to go back to college. I use 10W-40 in the winter, and 20W-50 in the summer (upon advice from DesertDueler). The 20W-50 will hold up to the AZ heat better then the 10W-40 I used to run I have been told by a few people.
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    GM specs 10w30 or 5w30. I run Mobile1 15w30 on my Supra and The Ladys's 79 with a crate. The Toyota is brutal on oil is the Mobile1 does excelent in it.
    Word of warning, don't put a synthetic into a high mile engine. They will start leaking like a seive.
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    I second that. My dads F350 has 96K, and leaks/burns oil, and he had me put in the Valvaline stuff for the high mileage engine. The only thing it did, being a partial synthetic was burn more oil then it did with conventional oil.
     
  6. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    Location:
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    I run 20w50 synthetic blend all year in WA. I love the synthetic blend stuff, not too expensive but holds up way better than regular oil.
     

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