4.9L Oil Consumption - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9L Oil Consumption in Cadillac Engine Technical Discussion; Originally Posted by Tailfin Maybe a happy medium here...like 15w-40? That's too viscous at operating temp....
  1. #16
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by Tailfin
    Maybe a happy medium here...like 15w-40?
    That's too viscous at operating temp.

  2. #17
    delerium75's Avatar
    delerium75 is offline Cadillac Owners Fanatic
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    Re: 4.9L Oil Consumption

    Anyway, back on topic... '91 STS (almost 94K) goes through about a quart every 600-800 miles and I've seen black smoke in the rearview mirror occasionally when I give it the beans. '92 Fleetwood (114K) has needed nothing between changes. 5w30 during winter and 10w30 during the summer.

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