Used Oil Analysis - High Nitration and Fuel Dilution - Saab 9-5 Bulletin Board - Saabnet.com
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Used Oil Analysis - High Nitration and Fuel Dilution
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Posted by Roger (NAWC) (more from Roger (NAWC)) on Thu, 5 Dec 2019 05:32:56 Share Post by Email
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I posted this to Facebook's tech help page, but I thought I'd ask here as well.

I have a 2008 9-5 wagon manual 5-speed that I bought a couple of years ago. I've done some use oil analyses, and everything's good (after some tune-up after the first analysis), but the fuel dilution is stuck around 2% (should be not more than 0.5%), and the nitration is also high. This apparently indicates an air restriction and poor combustion, although the car drives well. Here are some details:
PCV replaced

Air filter replaced frequently (5k miles, just to rule it out as the restriction)

Spark plugs (NGK PFR6-H10), O2 sensors, and DIC (Saab OEM) replaced about 15k miles ago

The DIC failed last year, and the unburned fuel melted the front catalytic. Replaced with a Taliaferro 3" downpipe.

Berryman Chemtool used every few tankfuls to clean the system. Gas is usually Sunoco or Shell 93 octane.

Battery died a few weeks ago (only 26 months old, but new battery reads 14.14 volts at idle, so I think the charging system is ok

Changed the clutch about 6 months ago and the car was a bit sluggish afterwards. I just assumed it was the new trannie fluid. Last week, it suddenly picked up again and is pretty quick now.

I put a Tech 2 on last night. Idling in my garage (not sure if it was at operating temp, but the coolant was 127F), I had:
mass air flow 4.3 g/s
air mass deviation 0%
short term fuel trim 9%
O2 sensor 1 0.35V
O2 sensor 2 0.65V

I think replacing the MAF couldn't hurt. I replaced the valve cover gasket a few months ago, and the oil looked good (no sludge). I'm not sure what else to look at.

Thanks very much in advance.

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