Only 397,459 mi. on my 1985 B230F, but who knows? As has been mentioned, you probably don't want to put a big turbo on one of these and then go drive it like you stole it, but for plebian driving, it should be fine. I've used synthetic oil in my 1985 since I bought it at 200,000 mi., and changed it every 20,000 mi. Go for a '91 and later oil squirter engine if you are going to bother with a turbo modification. The folks over at turbobricks.com have an enormous pile of information with regards to turboing red motors. Good luck.