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The longer life of the oil is a marketing thing. I have been using 0 trans fat oil in my restaurant for 2 years and we still change the oil every couple of days. The oil is a lot more expensive and some restaurants may try to extend the useful life of the oil by adding anti foaming agents, but the food will suffer.
Some of the instructions said to lower the oil temp in off peak times, and to use a costly filtering system. We use the filtering system, but it has no effect on the life of the oil.
As a side note when we switched to 0 trans fat canola oil, it was cheaper than the hydrogenated oil.
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Peppy
2011 BMW 335d
1988 Targa 3.4 
2001 Jetta TDI dead
1982 Chevette Diesel SOLD 
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