blackduc98 said:
Not to dispute what your mechanic said, but I'm just curious: how much and how often did you put premix in your truck? How diluted was it with normal gasoline?
BTW, I thought that the active ingredient in catalytic converters is platinum rather than ceramic?
First off, I'm not a mechanic so I just went by what my mechanic said. I'm not sure diluting it makes much difference because the same amount of oil is going to eventually go through the cat. convertor regardless of the ratio. My truck (1996 Chevy S-10) had 80,000 miles when I had the CC failure in 2005, which my mechanic said would be considered a premature failure. So say over nine years I ran several quarts a year through; it would add up. I still run old premix in my truck. I figure I won't have it when it needs a new catalytic convertor at 160,000 miles.
Also, keep in mind, 2 stroke oil and motor oil are different. 2 stroke oil is formulated not to burn at cylinder operating temperatures. I don't know that that is true about motor oil.
Re: catalytic convertor technical details form Wikipedia: "The core, or substrate. In modern catalytic converters, this is most often a ceramic honeycomb, however stainless steel foil honeycombs are also used" AND "The catalyst itself is most often a precious metal. Platinum is the most active catalyst and is widely used."