Posts: 83
Location: minnesota | I have a 2012 115 Mercury Optimax Pro XS that I normally run with Mercury Optimax oil or Quicksilver DFI oil. Never had an issue with either of these. A few weeks back I topped off the oil reservoir with Quicksilver Premium Plus. I didn't really think anything of it since the bottle said it was good for Optimax / DFI motors but ever since I added the Premium Plus my motor has been running a lot rougher. More smoke, seeing unburnt oil, poor idle.
Is mixing DFI oil and Premium Plus a big no-no? I probably added 2 quarts of the Premium Plus to the tank. Should I drain the tank and refill with all DFI oil (change spark plugs, run quick kleen)? Or are there other things I need to do to get my motor back to running healthy?
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