I remember reading an article by Smokey Yunick back in the 1970's describing a similar process, except he used kerosene and ran the engine for 30 seconds (!). I'd be afraid to ever try this myself.

The closest I've gotten is using 10W30 Agway Super Diesel oil this winter. I figure that this oil is rated for properly lubricating a diesel engine up to 50 deg F, and the thinner viscosity should help remove a bit more sludge than my usual 15W40. I do notice a faster warmup to normal power levels.

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic