Saab 9-5 First generation (YS3E, 1997–2010)

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Engines
The first-generation 9-5 is powered by Saab's B205 and B235 straight-4 engines, and from 2002 in Europe by an Opel Ecotec X22DTH 2.2 diesel engine (Saab D223L), replaced in 2006 by Fiat's 1.9 JTD 16V diesel straight-4. A turbocharged version of the GM 54° V6 engine, designated by Saab as B308, has a unique asymmetrical low-pressure turbocharger and was available from 1999 to 2003. This engine is available only with an automatic transmission, and cars with this engine installed are distinguishable by their twin tailpipes. The V6 is only available on Arc, SE, and Griffin models. In 2004, the V6 engine was replaced by a high pressure turbo straight-4 engine producing 220 hp (164 kW). By 2006 this engine was producing 260 hp (194 kW) even in the non-Aero or non-sport models (US models).

The B2x5 engines can suffer from oil pickup issues caused by 'oil sludge' in the lubrication circuit. In 1999, Saab issued a Workshop Bulletin around this issue.[8] The 'sludge' issue primarily affected earlier models between 1999–2003, and from 2004 a revised engine positive crankcase ventilation system (PCV) and the use of fully synthetic oil were introduced.

Saab created retrofit kits for the earlier 1999–2003 cars as the PCV design differs from the 2004 and later system. In 2005, Saab extended the warranty on the B2x5 engine to eight years and unlimited miles from new[9] for original owners, provided the owner could produce proof that they had followed the manufacturer's oil change intervals. Saab recommended the use of fully synthetic or synthetic-blend oil as a preventative measure.