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  #1  
Old 12-12-2008, 01:04 AM
ThreeKings06 ThreeKings06 is offline
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99 Seville Oil Viscosity?

What type of viscosity is recommended for my 99 Seville STS. Also, I notice that my car burns alot of oil, is this common? and is it repairable?
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Old 12-12-2008, 11:05 AM
maxwedge maxwedge is offline
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Re: 99 Seville Oil Viscosity?

Oil consumption is common with these engines. There is a complex procedure done by Cadillac to free up stuck rings. 10/30 I believe is recommended but check the owners manual.
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Old 12-12-2008, 07:27 PM
caddydaddy caddydaddy is offline
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Re: 99 Seville Oil Viscosity?

10W-30 for pre-2000 Northstars.
As for the oil consumption, some people reduce it by doing a couple of full throttle runs with the shifter in 2nd. Of course do this in a safe location, but the high RPM shifts will help to free up any carbon from the rings, without having to go to the dealer for a chemical treatment that does the same thing.
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Old 12-12-2008, 08:26 PM
maxwedge maxwedge is offline
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Re: 99 Seville Oil Viscosity?

The loaded full throttle runs have been somewhat unsuccessful, especailly if the condition has been long standing issue. Carbon builds up on the oil ring, from stop and start and " granny " style driving. Even Cadillac's non intrusive fix has been marginally effective, and many engines had to be rerung.
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Old 12-17-2008, 04:48 PM
ThreeKings06 ThreeKings06 is offline
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Re: 99 Seville Oil Viscosity?

Thanks a bunch for the info and I will try it to see if it works.
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