Post script: I failed to advise you & others of the following:
It is important that the engine (any engine with more than 5,000 miles) is throughly flushed before instalation of AMSOIL. The reason for this is to remove the built-up sludge & contamanents. It always pays to put new/clean oil into a clean engine. This will give you the greatest increase in fuel economy, horsepower, torque etc.
Also, everyone running AMSOIL Motor Oil should of course run AMSOIL Oil Filters. 5X finer filtration!