If I was looking at a 1993 325 engine on the ground and a 1993 525 engine on the ground, How would I be able to tell the difference between the two?:uhoh:

A 325 and a 525 are the same engine, just in different models (3 or 5 series) both are 2.5 Liter inline sixes.

If I was looking at a 1993 325 engine on the ground and a 1993 525 engine on the ground, How would I be able to tell the difference between the two?:uhoh:

If it's out of a 325, the engine mounting arms will look like these:

http://www.realoem.com/bmw/showparts.do?model=BF31&mospid=47430&btnr=11_1296&hg=11&fg=10

If it's out of a 525, the mounting arms will look like these:

http://www.realoem.com/bmw/showparts.do?model=HD53&mospid=47404&btnr=11_0084&hg=11&fg=10

Also, a 525i engine will have the sump of the oil pan toward the front of the engine. The 325i engine will have the sump toward the rear of the engine.