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Will a 1999 Saturn SL1 engine work in SL2?

No, a 1999 Saturn SL1 engine will almost certainly not work in a 1999 Saturn SL2. While they're both from the same model year and share some platform similarities, the SL1 and SL2 had significantly different engines. The SL1 used a much smaller, often three-cylinder engine, while the SL2 used a larger four-cylinder engine. Even if you could physically fit the engine, the engine mounts, wiring harnesses, and computer systems would be completely incompatible.