Ok, here’s the news. I’ve used a qt of Octanium Unleaded per 15-17 gallons of fuel religiously for about 8000 miles over 2 years switching to corn around Sept for 2000 miles since using any 93 with Octanium. I’ve read and heard corn cleans things up, well I don’t think it touches whatever residue Octanium leaves as 2000+ miles of aggressive corn fed driving doesn’t look like it’s removed anything, in fact I tried a few different very potent industrial licensed only solvents on the residue and nothing short of mechanical action (abrasive products) removed it. Ok, I have posted pictures in the past of spark plugs that don’t look too bad, O2 sensors that don’t look too bad, exhaust header interiors that don’t look too bad, mostly parts that would be easy and cheap to change even if they did look bad but they where being used as a gauge for what it may be leaving on components such as pistons and valves that aren’t cheap or easy to change. Well I tore my engine down this winter and noticed the valves looked pretty crummy, like rust on them but knew it was MMT residue, no biggie. So I figured I’d clean them up in place since they had perfect seal. Looking at them big ol intake valves they looked like a flat top valve not allot of build up on them and the exhaust valve looked the same, flat top but a smooth thin coating of ugly rusty looking MMT on them. So I tried getting it off, no chemical touched the stuff, not even soaking on it over night. So out came the dremel with a fine sanding disk, came off the intake valve easily. So on to a exhaust valve, well turns out the exhaust valve isn’t flat topped like the intake it has a deep tulip shape to it and was completely filled with MMT like it was spray welded in there. Was a REAL PITA to remove it too, took like 10-15 discs per valve and about 2 hours or so per cylinder to get the crap out of them and polish everything clean again. That filled in space had to up the CR by making a smaller squish area leading to possible increased chances of detonation maybe even? Bottom line I won’t use it any more, glad I’m on corn now and won’t have to, but I wonder what others like Torco which is nasty as hell MMT wise but works the best has been doing to the inside of my Capri’s 302?? I only use it in it when I’m planning on spraying it so it doesn’t have cases through it like my cat had. Sooooo I have to un-endorse my recommendation of using Octanium Unleaded based on these findings. Look at the pictures below and judge for yourself’s your continued use or not.
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