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Old 12-17-2013, 07:54 PM   #1
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looking at 9-5's ... I see so many with blown motors.. what goes bad? I hear about the pcv update is it the lower end knocking or do the motors sludge up? also I hear about turbo's failing and now the car does not run or starts and dies.. I have had the wastegate rod fall off and the car will not have boost but it still runs and drives.....looking at the 1998-2002 range cars...thanks for any info guys
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Old 12-18-2013, 08:58 AM   #2
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If they don't get regular quality oil changes they will sludge up (2000-2002 9-3's do the same thing). When they sludge up, it will wear out the bearings, balance shaft bores, timing and balance shaft chain guides, cam bearing surfaces and will clog up and kill the turbo - basically everything that depends on steady oil pressure.

If you are looking at a higher mileage one just make sure it has service records, as long as the engine is quiet and smooth usually the worst case is you have to drop the pan to clean any accumulated sludge out of the screen in the pickup tube screen, run a little engine flush on a few low mileage oil changes and you're good to go.

FYI my '99 9-5 just hit 277k miles and it's clean as could be in the engine. I have every oil change record back to new and it never went more than 6k miles between changes with full- or semi-synthetic oil and it's never had the oil pan off, and is on original timing and balance shaft guides, and it doesn't even have PCV-7 on it, it has the previous version, had it when I got it. *knock on wood*

It's all about maintenance with these.
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Old 12-20-2013, 02:30 PM   #3
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lack of oil or sludge, t7 engines drink oil people forget to fill them lol


edit -What is pcv 7? i though 6 was the newest one? :s
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Old 12-20-2013, 03:20 PM   #4
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Whichever. You're right, I meant 6. Mine has the old version that doesn't have the vent nozzle on the oil fill tube.

I've been in my engineering job long enough that some of the numbering stuff from running the Saab shop is starting to slip. :-/

Now my brain is a repository for an entirely new batch of semi-useless specialized specifications and parts designations and such.
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Old 01-13-2014, 10:28 AM   #5
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better to get a 2004 and stick with the 4 cylinder. I haven't heard of a lot of blown engines, honestly. Like it has been said, if you take care of these cars/engines they will last a long time and remain reliable.
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Old 01-13-2014, 11:15 AM   #6
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You'll find any T7 car with a blown motor if the owner didn't change oil very often.
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