dirt bike mag? these are the same guys who use the term "decompression braking" all the time so they think they sound smart. since i was about 7 i think i knew that it's really "compression braking" that describes the drag caused by a decelerating 4stroke engine. every road racer/autocrosser on the planet knows this.
as for the oil, most mobil 1 grades contain friction reducers designed to increase mileage in cars. in fact this could be said about automotive oils in general. it's been said that these friction reducers may cause clutch issues.
however, some oils, and specifically mobil 1 15w50 (the RED cap) *do not* have these friction reducers. in the API circle on the back of the can, there will be no "Energy Conserving" wording. there are a million theories on what brand oil is "best". no one knows, and your application (e.g. trail riding in colder climes) is going to be totally different than the next guys (e.g. mx racing in the hot sun).
so use whatever non-EC oil you want, and change it frequently. if in doubt, read your manual and use exactly what the manufacturer recommends. as for what you hear on DRN-- why the hell would you trust a bunch of people who you never met, can't blame, and for all you know are just AI bots a la The Matrix? :eek:
the wrooster