RE: DL-50 engine
Mando and Solo 48 I found out the hard way that if you change from dino to syn oils and do not clean out your fuel tanks and field tank you can get a type of flim type of build up on your filters and screens in the carb. Now it may not happen with all oils but I do know that lawnboy and Ehco syn leaves a thin flim in the system when I switched over. I am staying with pennsol air-cool two cycle oil from now on. Just my two cents worth. I drained and cleaned the field jug but not the fuel tank and lines to the carb when I ran into this problem.