In Reply to: 1990 525i Engine swap?? posted by Jim Holcombe on March 30, 1999 at 19:07:49:
I'm not an expert on this, but I would think you would need the DME (engine control module) swapped, maybe the transmission module too. Now you're talking $$$. Put the 2.5 in, sell the car and get a 3.5 complete. Probably cheaper.
: My (90' 525 auto) head is cracked ($$$$). I'm getting estimates of $900 for the head $500 for labor. I also see complete engine prices for $1400. If I should get the complete engine, can I put a different model engine (535,later model 525, etc. ) in with no modifications.