finally found the 5w-20 TSB...

[R2D2]

Silky,

With all due respect if Dr AE Haas can run 20 wts in an Enzo and a Lamborghini I think a stock Yaris will do fine on it if it's a quality oil formulation. I bet the Enzo and Lambo don't mention 0W-20 or 0W-30 in there manuals either. :)
I thought you were initially pleased with the Syntec? I believe you had "padded" it with some 10W-40, correct? The noise you keep referring to-when is it occuring? My Yaris is a little noisy when "cold" but is very quiet when fully warmed up and the oil is at it's "thinnest". I have always used 20 wt so far and have heard rumors the factory fill was a 20 also (I have no proof for this yet). Engine loves to rev but rarely gets to as I putt around and gawk at my ecometer!

The Rotella is a nice oil but would make me uneasy during a NH winter! Sure, I think it will start fine but it may (rather loudly) protest. Hope it works out for you better than the Syntec-let us know!
R2

[1stToyota]

Originally Posted by R2D2

Silky,

With all due respect if Dr AE Haas can run 20 wts in an Enzo and a Lamborghini I think a stock Yaris will do fine on it if it's a quality oil formulation. I bet the Enzo and Lambo don't mention 0W-20 or 0W-30 in there manuals either. :)
I thought you were initially pleased with the Syntec? I believe you had "padded" it with some 10W-40, correct? The noise you keep referring to-when is it occuring? My Yaris is a little noisy when "cold" but is very quiet when fully warmed up and the oil is at it's "thinnest". I have always used 20 wt so far and have heard rumors the factory fill was a 20 also (I have no proof for this yet). Engine loves to rev but rarely gets to as I putt around and gawk at my ecometer!

The Rotella is a nice oil but would make me uneasy during a NH winter! Sure, I think it will start fine but it may (rather loudly) protest. Hope it works out for you better than the Syntec-let us know!
R2

Mine's just the opposite; quiet at start up, but just a little noisy off idle in 1st gear when warm.

[TheSilkySmooth]

Originally Posted by R2D2

Silky,

With all due respect if Dr AE Haas can run 20 wts in an Enzo and a Lamborghini I think a stock Yaris will do fine on it if it's a quality oil formulation. I bet the Enzo and Lambo don't mention 0W-20 or 0W-30 in there manuals either. :)
I thought you were initially pleased with the Syntec? I believe you had "padded" it with some 10W-40, correct? The noise you keep referring to-when is it occuring? Hope it works out for you better than the Syntec-let us know!
R2

AFA oil weight - I think you have to look at each engine individually, though of course and engine "family" would be the larger set. My engine continues to have intermittent cold or hot excessive noise (bearing/valvetrain/t-chain) so I'm starting to wonder if I should drop the pan and see if ther is something around the pickup. The Fuel quality here is atrocious and I have gotten a tank with (assumed) way over 10% ethanol or somehow misformulated, given the car barely ran after the fill (87oct @ Mobil). I'm not sure if this poor fuel is also contributing to my oil woes. I am also dealing with an Exhaust backpressure issue whereas after tooling around for tens of miles, if I operate the car at WOT or near WOT merging on the interstste, I'm getting exhaust into the cabin (sulfur dioxide smell). I am currently pursuing through Toyota Customer Care and the dealer having the exhaust replaced with an upgraded hi-flow front pipe which was available to 3 dr owners in MY '06 and '07 throuh a TSB you can view elsewhere on this forum. So adding all these factors in-toto appear to be killing just about ANY oil in my car. I hope the engine survives till I get these issues resolved - it's sounding worse every day. I have a jug of 0w-30 AFE on deck for sub 20 deg winter weather.