Additives -
My view ... motors run on fuel, not additives, but there are occasions I will use them, either in a regular dosing, like recommended for some DFI motors, or in a ‘shock’ treatment to remove carbon, or as ‘decarboning’.
RingFree - Don’t use it myself, but many appear to have good success with it.
Marvel Mystery Oil - I think it was fine for old technology carb’d motors and lead or MTBE fuels, but if using as a decarb elixer there are better choices. FYI, Project Farm on YouTube has extensive tests comparing all decarb elixirs.
OMC Carbon Guard - Works, but is strictly ‘motor specific’, for older DFI 2-stroke technology motors that aren’t running on a pure synthetic oil, e.g., Bombardier XD100.
SeaFoam -
My personal ‘magic’ elixir of choice! I use it, as ‘shock’ treatment only, in any carb’d or old tech DFI motor, or EFI 4-strokes, but would not use in a new latest generation DFI 2-stroke, e.g., Evinrude G2 motors. To date, I have had people GIVE me non-running lawnmowers, chain saws, weed whackers, OB motors, and a $500 pressure washer that were all cleaned out using SeaFoam.
On my OBs, I’ll do a shock treatment every 50-hours of run time. I even used it once in my old Ford Explorer, intaked through the vacuum hose, where I let it consume 1/4 the can until she smoked heavily, then shut it off for 15-minutes. Repeated same for next 1/4 can until gone. Post treatment the engine was smoother, didn’t stumble at lights, had better acceleration response and fuel economy went up. Again, Project Farm has some incredibly documented tests, with before & after compression and other values recorded, even photographic evidence ... where he proved to himself that SeaFoam was THE best ‘decarbon’ product out there.
StaBil - My only choice for off-season fuel storage or for fuel (gas home equipment) containers w/seasonal use.
StarTron - Don’t use it myself, but if you do ... buy the diesel formula and SAVE 50% on the purchase price! Just be sure to use half the dosage!
This is the actual email to my friend Dave, as reported on my Parker boat website, Classic Parker:
From: Peter Dorneau
To: Johnston, David
Sent: Mon Sep 04 13:24:46 2006
Subject: RE: Star*brite 'Contact Us' Form Submission
David,
They are exactly the same product except the diesel formula is twice the concentration. So use the diesel at 1/2 the dosage and you have StarTron for Gas. Do not worry about over dosing as you can not. Double is fine.
Thus if you use this and buy their diesel versus the gas formula ... you get twice as much product for your buck! FWIW, you can prove this for yourself here, as 16-ounces of the gas formula treats 256 gallons of gasoline while the same amount of the alleged 'diesel' formula treats 512 gallons of diesel fuel.
... provided you use 1/2-as-much as stated on the container that is !