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Thread: 1989 Cadillac Brougham Knocking PLEASE HELP!!!

  1. #16
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    Whatever your owners manual suggests for your climate. 10W-40?

  2. #17
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): 70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
    Join Date
    Feb 2007

    Re: 1989 Cadillac Brougham Knocking PLEASE HELP!!!

    Can you even buy straight 30 weight any more? It seems I only see it in the lawnmower section. You might want to double check what was put in there. Try some name brand high mileage 10w30 or 10w40 and see if that helps. Also make sure it isn't just idling too low. The only time the oil light ever flickered on my 92 Deville was when I tried some Carquest 5w30. I went back to 10w30 and the oil light didn't flicker any more. Go figure huh?

  3. #18
    reelheavy is offline Cadillac Owners Fanatic
    Automobile(s): 1989 cadillac brougham
    Join Date
    Apr 2011

    Re: 1989 Cadillac Brougham Knocking PLEASE HELP!!!

    The prognosis is in and it is a thrown rod. Me and my mechanic torn the car apart today and that is the problem. That 307 was good to me but now it is tome to really get the caddy the way I want it. I am looking for a 472 to go into the car and I am going to make it my project car. I guess its time to go get a car note. And slowly but surely put the car back together the way I want it. I appreciates all you guys help in trying to help me get the issue resolved you all were a great deal of help.

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