[serialk11r]

That's what you'd think, 5W is 5W, 0W is 0W, 10W is 10W, but all the data I've seen says that 5W-20s are a little bit thinner on startup than 5W-30s. Similarly 0W-20 are thinner than 0W-30s on startup.

I have a 10W-30 right now and the engine sounds like crap when cold, makes all sorts of noise :/ MPG is also horrid in the first few miles, seems to average 23 or so. Luckily the coolant warms up quickly. Going down to 5W or 0W 30 next time, hopefully things are a bit better. Apparently the difference in oil pressure upon startup between different 0W-20 oils can be very large, on bobistheoilguy I read a post where someone switched from one 0W-20 (forgot which one) to Toyota 0W-20 (highest viscosity index oil commonly available), and oil pressure dropped 20psi :O