At one time I had every MDS engine size from .40 to 2.18 and can say that they were very good engines. I had the good sense to run them on Fox 5% fuel with 20% 50/50 syn/castor blend. I had AJCoholic Diesel heads for three of them. The .78, the 1.48 and the 2.18. Nothing broke on them. I sold most of them a couple of years ago when we were taking care of our daughter who had a stroke. Her care completely broke us over a 2 and one half year period. Where I once had 140 engines, I now have about 35. I still have an MDS .58 which is awful looking being coated with years of cooked on castor but still runs very well.