Quote:
Originally Posted by Fleshy
I really do not understand why there is so much focus on cold viscosity 0 vs 5? IMHO for a double duty DD/track car I would just go 0-30 and be done with it especially with any group V syn due to the base (conventional oil would be a different story). Technically even at 80F it is a cold start so why not.
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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.
[ame="http://www.youtube.com/watch?v=dIsG_8TVokw"]Subaru Winter start up -44c - YouTube[/ame]