- #7 of 38
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Re: oil usage [lagunshy]
by fun4u
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Jan 28, 2007 (11:57 am)
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Replying to: lagunshy (Jan 28, 2007 7:45 am)
Thanx for the background and for the encouragement. I'll start organizing my assault on Cadillac with service records and experiences, then make the call.
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- #8 of 38
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Oil usage/carbon buildup
by richw5
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Jan 29, 2007 (1:51 pm)
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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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- #9 of 38
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Re: Oil usage/carbon buildup [richw5]
by geo9
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Jan 29, 2007 (5:10 pm)
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Replying to: richw5 (Jan 29, 2007 1:51 pm)
My 96 used to suck down 1 qt. or so every 1000 miles.
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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- #10 of 38
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Re: Oil usage/carbon buildup [richw5]
by bolivar
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Jan 29, 2007 (11:17 pm)
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Replying to: richw5 (Jan 29, 2007 1:51 pm)
I agree.
'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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- #11 of 38
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Re: Oil usage/carbon buildup [bolivar]
by geo9
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Jan 30, 2007 (7:58 am)
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Replying to: bolivar (Jan 29, 2007 11:17 pm)
Bolivar...........CHUCKLE !
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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- #12 of 38
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Re: Oil usage/carbon buildup [bolivar]
by sls002
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Jan 30, 2007 (3:02 pm)
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Replying to: bolivar (Jan 29, 2007 11:17 pm)
Synthetic oil might also help as there is less ash when it burns. I usually run my SLS wot in second gear up to the speed limit while climbing a hill about 1-3 times per week. At 60 MPH I am at 4000 RPMs, so 6000 RPMs should be pushing 90 MPH.
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- #13 of 38
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Re: oil usage [lagunshy]
by csman
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Feb 01, 2007 (11:56 am)
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Replying to: lagunshy (Jan 28, 2007 7:45 am)
I have a 2003 Deville that is consuming 3+ quarts between oil changes; it is in the shop now because after I had the top clean done to clean the rings or whatever it was now it is sputtering and will shut off. This may or may not be related but I am estatic to find someone dealing with a simular problem. I am going back and forth now with my extended warranty company who want me to assume cost for tearing the motor down with no assurance that they will pay (depending on the determined cause of usage). And in worst case scenerio I may be responsible for the repair cost of over $5000. I have read your prev. comments and want to know more. You contacted the Cad. people not the warranty co? and what was the determined cause of the usage? I was told that a qt. per 1K miles is not usual. If so I think that is ridiculous for a Cadillac. Please Help!! ANYONE
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- #14 of 38
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Re: oil usage [csman]
by lagunshy
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Feb 01, 2007 (2:18 pm)
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Replying to: csman (Feb 01, 2007 11:56 am)
yes sir 1qt. every three thousand is excessive. call cad 800# in the back of your manual. i played heck for 3 months to get help. i ended up doing an oil usage consumption test for 3 thousand miles and the cad rep of my dealer fell under all the pressure and the did a complete rebuild. the cause is due to a test set of pistons and ring combination that the rings are solid and cant shed the carbon build up. cad ownes resposability for this and i was clear out of warranty but do not give up. it willo take cad out of california a couple days to get back to you but they will. the run your cad a little differantly theory is after all is said and done to a couple times a month put your foot in it to blow this build up out.also that top end clean out is a crock of you know what.too late to tell you not to do it but i didnt let them take that route. you have my sympithy with what you are going through but do not let up or give up. contact me anytime for whatever i can do to help at lagunshy aol.com
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- #15 of 38
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Re: oil usage [lagunshy]
by csman
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Feb 02, 2007 (6:50 am)
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Replying to: lagunshy (Feb 01, 2007 2:18 pm)
Thanks, I going to do a consumption test with close monitoring for the next 2k-3k miles and go from there. You have been really helpful. Your messages have caused me to do a lot of research on this and I have been shocked to find that more folks than not are have this same problem. I may contact you later. Thanks
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- #16 of 38
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Re: oil usage [csman]
by lagunshy
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Feb 06, 2007 (4:04 pm)
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Replying to: csman (Feb 02, 2007 6:50 am)
you are more than welcome. if all thepain i went though helps another then it may have been worth it!!!!
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