I would contact Amsoil and ask them what is going on with their site and what do they actually recommend. Both Amsoil and Mobil 1 say their 0W-30 covers all bases for anything that ends with 30.
Originally Posted by accretian
0W-30 should work just fine in theory. Also, there's less chance for your oil filter to go into bypass mode on a cold day and if it does, the duration will be less. Bypass mode means there is unfiltered oil going through your engine. This happens in cold weather startups.
What do you get for low temperatures during the winter? Forget about windchill, motor oil isn't affected by it.
If you had an engine failure, they would likely have the oil tested in a lab. They would also have to prove that the oil caused the problem.
More "Pour Points":
Amsoil 10W-30 Signature Series synthetic: -48C (-54F)
Amsoil 0W-30 Signature Series synthetic: -51C (-60F)
Valvoline 10W-30 MaxLife synthetic blend: -42C
Valvoline 10W-30 conventional oil: -36C
Last edited by Jeepman; 12-01-2011 at 11:13 PM.
2007 GC SXT - Magnesium - S&G - 3.8L - 173,000 kms
2002 GC Sport - Stone White - 3.3L - 358,500 kms
2003 Jeep TJ Sport - 4.0L - 279,000 kms