I would never buy the small bottle of Lucas UCL.
The quart or larger is the only way.
I 100% agree, there. And if you don't have the extra $5 at least the quart-bottle, then just wait until you do. Those little skinny neck bottles are a waste. Well, maybe not a waste, but a huge ripoff compared to the prices of the larger quantity bottles. I know that's how the world turns, but the difference is astonishing.
But, I've had a big bottle of the stuff for awhile, keep forgetting to bring it with me when I put gas in my truck, so it's lasting even LONGER than normal. I always put a little tad in my lawnmower and a drop or two in the tiny tank on my 4-cycle weed eater.
If Seafoam has went up that much, that is crazy. I will not buy it until it's back down to the $6 mark.
Lucas UCL does what it claims. It works. A 2-stroke oil is practically the same. Some say it's even better. But, while most Lucas products are underpar, imo, according to their price, the UCL does work and do what it claims. It lubricates. It's good for fuel pumps and carburetors, imo, more than anything.