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 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 online now Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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    Sep 2010
    East Boston MA.
    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
    Automobile(s): 1991 STS, 1992 Fleetwood, 1987 Maxima wagon
    Join Date
    May 2008
    Bay City, MI

    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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