read this study http://neptune.spacebears.com/cars/stories/oil-life.html
it is saying that using Mobil 1 syn. oil, it is actually better on the engine to change it at a minimum of every 7500mi. but up to every 15k miles. basically, once a year.
it is saying that using Mobil 1 syn. oil, it is actually better on the engine to change it at a minimum of every 7500mi. but up to every 15k miles. basically, once a year.