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Old 07-16-2012, 04:55 PM   #11
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Originally Posted by SignOfZeta View Post
It'* perfectly normal for an engine to consume oil. Even when new, a 3800 Series II is rated to burn about half a quart every 3,000 miles.

I can't imagine a 2005 GXP has too many miles on it, but if it does, you may want to look into replacing the piston rings or valve seals whenever it'* convenient for you. Not sure if either are known problems with aging Northstars; ask one of the Northstar gurus.
Thats what really throws me off, I have a 1997 SSE with 143,000 on the 3800 series 2 in it and I run that to the full 15,000 miles and it doesnt change at all on the dipstick, same with my 1992 SE it doesnt move a mark on the dipstick for the 15K? I have owned four bonnevilles and the GXP is the only one that uses or loses oil?
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Old 07-16-2012, 04:58 PM   #12
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ya it'* really nothing to worry about. now when you start loosing more oil in less time that'* when it'* time to say screw it and drop in the 5.3L (you'll like the 5.3L a lot better plus you can play with it unlike the 4.6L)
Could you tell me more about this 5.3L engine? is it a Caddy Northstar and would it fit in the 05 GXP Engine compartment without any modifications? Thanks Sawgunner Im very interested. Take Care
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Old 07-16-2012, 05:05 PM   #13
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i dont know what it takes but 5.3 is ls4 available in monte, impala, and i think some gp gxp'* and bonnie gxp'* depending on the year.
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Old 07-16-2012, 05:11 PM   #14
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GM LS engine - Wikipedia, the free encyclopedia

W-body specific engine.

good luck dropping that in place of a northstar and having the PCM not go absolutely insane.

anyways, the LS4 were hooked up to the 4T65HD and can kill them in short order. why GM didn't just use the 4T80 on an engine that produces more torque than the northstars(which got the 4T80), i'll never know. at least then the transmission would have a chance at surviving.
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Old 07-20-2012, 02:26 PM   #15
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I dont know if this has anything to do with it but the previous owner used to put 10W30 Mobil oil and when I got it I changed the oil over to Mobl 1 High performance oil. I fluched the oil sump bu putting in the mobil 1 5w/30 and ran it for 2000 miles and then changed it over to 5W/30 hopefully getting all of the oriiginal Mobil 10W/30. The Car has 56,000 miles on it, I have hear that if you change oils over to synthetic it hardens the seals, Where I work we do predictive maintenence and one of our technologies is Oil analysis(CSI 5100 Oil Analysis Machine) it checks the viscocity, acid tests and WDA(Wear Debris analysis). After all of my flushing I took a sample into work and had it tested the Viscocity was spot on but the wear debris test showed small flakes of what looks like sludge or burnt oil. So I Flushed it again and retested and it was clean all around. It passed all the test so I think I got the oil sump clreean. Ill wait and see this next oil change because Ill take a drain sample to see if there is anything in the oil. thanks for the replies guys. Take care
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