Interesting. Hadn't heard of the problem. I wonder if its related to burning ethanol? I have heard that ethanol has gelling poblems and that truckers hate bio-diesel, not only because of cost, but it gels-up in cold weather and hell on injection pumps and injectors.
Have you heard anything along this line??
No, oil gelling appeared before the MTBE -> Ethanol switch. It appears to be caused by hot spots in the engine combined with the much thinner oils used today to meet EPA regulations.