new (not really) oil from mobil 1, 0w-30 and 0w-20

[1stToyota]

Originally Posted by R2D2

Well they haven't taken the GF-3 off the cap either-and GF-3 has been obsolete for many years

My point about the sound is that thicker oils tend to dampen noise better than lighter oils but it is not necessarily an indicator of increased wear. Oils of the same viscosity can also exhibit differences in sound dampening depending on how they are formulated.

At any rate I think the intention of the TSB is quite clear and the NZ series is plainly listed in the 5W-20 column. Warranty wise GF-4 in either 5W-20 or 5W-30 would be fine. I'll try to get Toyota's official take on this next week to clear up the confusion.

R2

I think it's clear that companies like Ford and Honda have been recommending 5w20 for many years, not just in a TSB, but in their manuals, on their caps and hood labels, so no confusion there.