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In regard to gel-point, it must thicken the fuel. But, I don't use it when it's below 20 degrees F - so I can't say I've tested it. We get 30 below here at times, and I run 50/50 kero-diesel mix with Power Service anti-gel added. Here's a quote from my 1982 Chevy diesel owner's manual: "Chevrolet is aware that some service stations mix used engine oil with diesel fuel. Some manufacturers of large diesel engines allow this; however for you diesel engine, DO NOT USE DIESEL FUEL THAT HAS BEEN CONTAMINATED WITH ENGINE OIL. Using contaminated fuel will effect emission control and could lead to exensive engine damage, which may not be covered by the warranty. Before using ANY diesel fuel, be sure to check with the service station operator to see if it has been mixed with engine oil." That's kind of funny, since only a few years earlier - late 70s, Chevy stated in the diesel manuals that gasoline could be used in an emergency in their 350 Olds-based diesels (only a certain percentage). When the first small diesels came out, there were not many small places to buy diesel - mostly just truck stops. So, diesel fuel could be scare. Still is in some places. I was in the Upper Penninsula of Michigan this summer. Planned to stay in Paradise for a week and look for land (Paradise is a town, not Heaven). Got there and found out their only diesel station was out of business. We had to turn around to go back. In regard to using used motor oil, it's not something I worry about - but I might if someone else was doing it and I had no control over it. I have my own large diesel tank, my own used motor oil, and I know how much I put in. Also, all my diesels are mechancially injected with virtually no emission controls. I wouldn't consider using this sort of mix in a late 90s or newer diesel. In fact, many new diesels have color-sensors and will shut the engine down if the fuel is not clear enough. And, other new diesels have particle-collectors built into the exhaust system that might get screwed up. Heck - as of 2008 - as I last read - no company will make a diesel car that can be run in California with just diesel fuel. Mercedes has the only diesel vehicle that will meet the new regs - but to be legal in CA - it has two tanks - a diesel tank and a chemical tank - and the latter must be injected with the diesel.
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