Castrol Syntec is a full synthetic.
Castrol Syntec is a group 3 oil, which, untill they sued to have it called "synthetic" - would have been classified as a dino oil. It is not near the quality of either Mobil 1 or Amsoil, which are true synthetic group IV oils.
I'll continue to buy and recommend synthetics made by the large oil companies that have the budget to afford the research required to develop top oils and stay up on current technology. Everyone hawking Amsoil wants to talk it up so they can sell it but I'm not buying it,... literally. Because Amsoil makes anyone with 20 bucks a "dealer" doesn't make it good oil. That's my opinion and I'll stand by it. That's all I intend to say about it.[/COLOR][/B]
You mean research like this?:
If mobil has some kind of comparison out there I would love to see it (or are they too busy passing out 400 million dollar retirement packages?)
As I've stated before, I have run both Mobil 1 MX4T and the Amsoil motorcycle oil and had them lab tested. Slight advantage to the Amsoil. Seems to be right in line with Amsoils report and have no reason to doubt it.
Just because Mobil is a huge company does not make it a better oil.
As for Amsoil - Use it or don't use it, I dont really care. Not really fair to the forum to claim that it's "just not the same" without any facts whatsoever.
BTW - I am not a dealer, nor have I ever been. Just a fellow rider who wants the best for his bike.