I am interested in a very clean 80's model Cadillac, around 60K miles, well serviced and pampered .... but with the HT 4100 4.1 engine. I have heard so many negatives about this engine. Should I avoid the 4.1 engine? There are other Cadillacs (and other makes) that I like from the 80's/early 90's that do not have the 4.1. What would you recommend? Avoid the 4.1? Thanks!