2-cycle oil in lieu of MMO - no/yes/what ratio?

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So I was a religious MMO user for 20years. I continued to buy it as the price rose over the years, then around 2006 the price exceeded $2 per qt & I started looking for alternatives. Not finding anything more cost effective, I reluctantly kept buying MMO even when it was $2.50 per qt (still avail by the gallon for $10 in 2008). When it became impossible to find it for less than $3 per qt, I threw in the towel.

I know many of you will say (correctly) that $3 per qt breaks down to a "reasonable" per tank treatment. In my case, 61 cents for 6.5oz into a 16g fill up (16.6g tank refilled w/1/2g remaining). But as the price keeps climbing, where do you draw the line?

Now, 2-stroke (aka 2-cycle, two stroke, two cycle for those doing a blind search) oil is an ideal UCL, as that's what it's designed for. But what ratio is appropriate in a 4-stroke engine? I've searched this topic & found surprisingly little here. Perhaps three posts yielded any insight on this. I think .3oz oil per gallon of gas was the consensus. That's a ratio of 427:1 - a far cry from the 50:1 most 2-cycle engines require.

2-cycle oil is thicker than MMO by a good margin, so 3oz per 10g would seem sufficient to offer the same UCL/fuel pump protecting qualities afforded by 25% more MMO. The cost of 2-cycle oil is pretty much identical to MMO by the qt & a lot less by the gallon. I'm pretty sure you can buy it in 5g pails too...that's sure to be MUCH cheaper. Let's say it's 25% cheaper...& you're using 25% less of it - It's pretty obvious that over time, the cost savings could be significant.

I just added 5.5oz of the stuff to my last (previously untreated w/anything) 16.6g tank to get started...a bit more than .3oz per gallon. I'm sure a lot of you use more MMO than the recommended .4oz per gallon. I wonder what the threshold would be before deposits & plug fouling would become a problem?

Lastly, what affect would xxx quantity of either UCL have on pre-ignition in high compression engines & detonation in turbo charged engines?

Thoughts on any of this?????

Btw - I've got a quantity (grocery bag full) of old 2-cycle oil in 8oz cans found in my Dad's garage. The tins are plenty rusty, but otherwise sound & leak free. I'm guessing it's from the late 70's - would you use it as is, or blend it w/some more modern stuff...of which I have an eclectic assortment.
 
The recommended dose for TCW3 oil is 1 ounce/5 gallons of gas. There is a thread about it on another board someone by the handle of Sarge is a moderator there and has quite of following of people using TCW3. He has suggested the amount I mentioned. My only caution is TCW3 is a very good UCL, if you use to much of it you can foul plugs. Otherwise it works very well!

Make sure you use TCW3 and not 2 cycle oil in the gas for your car. You want something that is ashless, so stick with TCW3!!!!!!!!!!!!!!!
 
I'd be worried about the ash that old canned 2cycle oil makes. Actually, I worry about the ash tcw3 makes... but I'm not a additive guy. You don't want to use so much that your EGR or Cat gets gummed up.
 
I'll use that old stuff in tiny amounts. If I don't get through it before I'm too old to drive, I'll will it to my kids
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