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I've had this run of M1 0w40 in my truck (8.3L V10, Viper engine) for 3,141 miles and just over one year (stored during winter months). I run the Mopar "Viper" specific oil filter, K&N air filter, and the truck has some mods (headers, exhaust, tune, colder thermostat, etc). This is the OEM spec...

First post after lurking on and off since 2003! Vehicle is my 1994 Jeep Cherokee 4.0L, with 223,000 miles on the original engine. The oil run was through winter, which had a few record-breaking cold days. I use a block heater with a timer so the engine isn't stone-cold for early morning starts...