Hello again. Last we met was here: https://www.motoringalliance.com/threads/2004-r53-re-build-thread.31480/page-9 That thread ended with the car running well but leaking oil from a few known locations. Here I am a year later, thinking I'd solved those problems, but no. Since the big misfire thread, we replaced the oil cooler sealing gasket. Re-installing the oil cooler was the death of it, and it failed completely, dumping all 4.5 liters of oil in a one-mile drive. That was fun. But it has a new oil cooler now! The car is still leaking. There is so much oil spread around the back, bottom and front of the engine, and up the front of the transmission, that neither I or my mechanic can pinpoint a location for the leak. In addition to leaking, we think it's burning oil. Regardless of the causes of abnormal oil consumption, we have to add 4 liters of oil every 1,000 miles. Car is at 163,000 miles now. I know oil consumption increases, but that's really too much, right? So the question in the subject line is where I'm at. I see my future facing one of those three options. I put a lot of work into it a year ago, and there are a lot of new parts that I can re-use, but a lot of new gaskets that won't be reused if I do a rebuild. But if I remove the engine to rebuild it, access is no longer an obstacle and by doing most of that job for the second time, maybe I'll do it right (assuming rookie mistakes last year have led me to this point). Or, I can find a used engine replacement. Looks like decent examples are around $2300 to $2500 (looking at Allmag, not sure what other sources I could use). But to be honest that feels like far too much money to spend after the spendy journey I've been on just to be where it is now. Or, last night my son (this is his car) said he'd finally consider parting ways with it (but thinks he would buy an E30... sweet jesus what I have I done to this boy...) It's not like I can get money out of it at this point. Part of me (most if I'm honest) says pull the engine, rebuild it, and put it back together. If it's running then, either keep it as a fun distraction / track car or sell it for whatever I can get.