I'm interested in "group think" on this one. We are looking at an '83 Defever 44. It has twins - one is a Lehman 120, the other is a Lehman 135. I've never seen or heard of a configuration like that but the present owner explained that it was built with two 120's, one of which failed while under warranty. The explanation is that there were no 120's available at the time, but there was a 135 - so they used it. As far as I know it's been that way for 3,000 hours. What kind of issues might crop up - difficulty synchronizing? Unequal acceleration curve? More wear on the 120 than the 135? Obviously it means two different sets of spares but I could live with that. Thought?