Oil can leak from the oil pump cover seal. Oil will be visible at the bottom and left side of the engine, behind the crankshaft pulley. The seal will need to be replaced.
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Newest reported Saab 900 problems
Oil commonly leaks from the valve cover gasket requiring replacement of the gasket.
Oil can leak from the oil pump cover seal. Oil will be visible at the bottom and rear of the engine. The seal will need to be replaced.
My 900 turbo had an issue where the sunroof drains would get clogged with leaves and other debris, causing water to leak when it rained and the interior to flood. Upon some research and talking to other owners, I learned this is pretty common with this model. Using compressed air, you can put the nossel up to the drain and force air through the drain duct, thereby cleaning it out.