i certified rotax mechanic in nebraska told me he saw great results with seafoam use in 912 rotax engines. i used a can of sea foam in each fuel tank of my 2011 sport crusier with 20 hrs on it when delivered to me. no negative reults so far with 42 hrs on it. i did e mail dean at lockwood aero and was told by him that use of seafoam in rotax engine makes you a test pilot and is not recommended. he did say tcp is fine to use and decalin is a new product and is unkown at this time if it is ok for rotax engines when burning 100LL. i did notice a dis coloration of the fuel with seafoam when sumping fuel tanks. i am using tcp only with 100LL fuel now; one can costs like 35 dollars and treats 350 gallons. will know results with 100 hr inspection of the spark plugs.
I personally don't think Seafoam will hurt anything, but doubt you get as much benefit as you might think from it either.
As far as Decalin, I know a hundred guys that use it and have been for years in the Rotax and they have never had any issues. TCP has some harsher chemicals and you're not supposed to carry it in the cockpit and I would make sure you wipe it off your paint. Decalin won't hurt anything and does the same thing as TCP. They are both lead scavengers. Decalin is just as recommended as TCP and as a matter of fact Rotax says they haven't tested either one, but neither show any detrimental effect.
The section 5.2 in the Rotax SI below.
SI-912-016Operatingfluids.pdf (You do not have access to download this file.)
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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