Quote:
Originally Posted by CSG Mike
If you've ever been in a cold climate, then you'll see a HUGE difference in how the engine starts. Sub-30F starts. Keep in mind, the factory recommendation is for "normal" use (aka not racing) and made for a wide variety of climates, anywhere from California to Canada (100F summer starts to -20F winter starts).
Gulf-spec cars will be equipped differently, as they see extremely high temperatures. 
This is extreme, but you'll see what I mean.
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I guess i was not clear with my point on my post. I am not talking about extremely cold conditions and am well aware of factory recommended vs racing oil differences.
I am saying whats the point of going to a 5w-10w vs 0w...strictly referring to group V or IV (due to the lack of VI additives and base used) and forgoing the benefits that we would see even here in a warm climate during a cold start and just stepping up to 0w-30 and seeing the same SAE 30 during track vs a 5w-30. Only referring to a double duty street and track driven car here.