SidecarFlip wrote:
I find Amsoil to be mostly fooey. If Amsoil was the 'holy grail' of lubricants, everyone would use it. It's not. Amsoil, Lucas, Golden Spectro, all are mostly advertising hype.
I'm with you there. My newly-licensed son recently bought an '03 Grand Prix GTP with 70k miles on it. The original owner used Royal Purple in it exclusively its entire life (filter, too). When it's cold it had a horrible lifter tap. Changing to dino oil and the Delco filter cured it. Maybe he wasn't using the right weight - I dunno.
I've always waited for the computer to tell me when to change the oil on my vehicles (well since the new millenium anyway). They're not just time/mileage things - there are sophisticated algorithms that factor in load, heat, etc.