Re: Oil Consumption Question - Saab 9-5 Bulletin Board - Saabnet.com
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If your lpt turbo is original, I think that is the primary suspect. Amsoil would have saved it's bacon for years but now consumption is spinning out of control (sic). Nothing lasts forever except the Mitsubishi turbos that is....:). mlc's comment about stuck rings being a valid suspect are a good one. Amsoil even mentions a flush they sell and a fuel additive (see below). I use Lucas UCL myself. Agree that valves are a fringe suspect but possible at those kms. Do you use premium Tier 1 one fuel? That could be part of the issue if you don't. The pickup screen might need some cleaning if extended oil consumption and high heat has coked up your oil over the last several years. The finer mesh screen in the 9-5 over the 9000 was a good theoretical design change in isolation but there is never a free lunch.
From the amsoil.com
Mechanical problems often to blame
A host of mechanical problems can also contribute to oil consumption (worn valve stems or valve guides, a stuck PCV valve), but worn or stuck piston rings are a prime culprit. The rings are responsible for forming a seal against the cylinder wall that prevents oil from entering the combustion chamber and burning. On the downstroke, the rings scrape excess oil off the cylinder wall into the crankcase. To form a good seal, the ring grooves must be true and flat, not flared or shouldered, and the rings must move freely in their grooves. Otherwise, oil can enter the combustion chamber and burn.
In some cases, using a higher viscosity motor oil can help fill the widening gap between the rings and cylinder wall, reducing oil consumption. Some vehicle manufacturers recommend multiple oil viscosities based on climate, such as 5W-20 in colder weather and 10W-30 in warm climates. Most, however, recommend a single viscosity. If your vehicle owner's manual recommends different viscosities, try switching to a higher viscosity within the acceptable range to help seal the rings.
You can also try using a cleaning agent to free stuck rings. AMSOIL Engine and Transmission Flush helps clean piston and ring deposits, promoting formation of a good seal to reduce oil consumption. For ongoing maintenance, a high-quality fuel additive, such as AMSOIL P.i.®, helps keep the pistons and rings clean and functioning properly for maximum engine performance.
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