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Sedans Cadillac DeVille Cadillac DeVille oil usage
38 messages, Last post on Mar 06, 2008 at 6:49 PM
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Replying to: lagunshy (Dec 09, 2006 6:40 am)
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Replying to: lagunshy (Dec 09, 2006 6:40 am) You referrred to a service bulletin on this excess oil consumption. Can you provide some details on bulletin so I can pass it on to dealer? Did you need to contact GM or Cadallac Division directly to get action? Did the latest service cure your problem, or just delay it.
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Replying to: sls002 (Dec 11, 2006 8:28 am) |
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Replying to: fun4u (Jan 27, 2007 9:45 pm)
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Replying to: fun4u (Jan 27, 2007 9:45 pm) |
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Replying to: lagunshy (Jan 28, 2007 7:45 am) |
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The quick and easy method of "getting the carbon out" is a few applications of "WOT". Start from a dead stop or when rolling and apply your right foot to the accelerator. When you hit 70 mph, slow down and begin the process a few more times until the carbob stops coming out of the exhaust. Yes, WOT is "wide open throttle" and was recommended by one of the Northstar engineers on a Cadillac information web site. It worked on my '99 STS and even lowered the oil usage back to specs. Besides that, it's a lot of fun. |
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Replying to: richw5 (Jan 29, 2007 1:51 pm) I went thru the ringer at the dealer with the consumption tests and this and that. Never smoked or leaked either. I learned to live with it especially after reading other N-star owners posts here or on several Caddy only sites. That car gave me over 125k miles and 6 years of problem free ownership when I traded it for my 03 (which is better and uses 1/2 quart every 3000 miles ! My 90 4.9? 4.5? DeVille never used a drop of oil between changes and also was troublefree and traded at around 100k plus miles for the 96............ 
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Replying to: richw5 (Jan 29, 2007 1:51 pm) 'Puttering around' in a Northstar will carbon up the rings, stick them, and allow oil blowby. From a rolling start, floor it. I recommend running above 70mph. At 70mph, it's probably just shifting out of second. Run it up and allow to coast down several time. If you have the nerve to glance in the rear view mirror, you will probably see a lot of black smoke the first time or two you open it up. Do this every month or so. Your oil consumption will drop.
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Replying to: bolivar (Jan 29, 2007 11:17 pm) That sounds like my moms 98 Deville with a BIG 50k miles! I have to take it out and run it hard and watch the clouds of smoke during the first few WOTs.......... She has been wanting a SUV and more room to haul around the grandchildren and junk so we have been look ing at the great deals on a late model SRX. Me, I will buy her 98 for the little woman as her Escort is getting long in the tooth................ 
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