2021 Sienna - Can I use 0w-20 permanently?

[XB_Fan]

Yepp, buy only the 2GR-FE Venza 14-15 and 2GR-FKS RX350 2019-2022. Avoid the other years according to the Car Care Nut due to cam tower silicone gasket leak at the cylinder head. The FKS has a plastic valve cover and a cam tower with gaskets in between. Idiots.

Yeah, I just watched his video on the FKS yesterday. He couldn't hide how unhappy he was with this engine. He all but said it is a downgrade from the 2GR-FE, despite the former's timing cover leaks and water pump issues at times.

 

[surfstar]

We're thinking of buying a Scamp to tow with our Sienna Woodland, and I thought that upping the oil to 0w20 would be a good call. This thread reassures that.
We've already lost some mpg up sizing our tires (235/65r18 from 235/60), but gained 1/2" clearance. With coil spring air-helper bags, larger tires and the Woodland "lift" - the OEM hitch shouldn't be too low!

 

[gfh77665]

Is this for fuel efficiency? Or can I cause problems by staying on 0w20 permanently?

1) Yes, totally for CAFE.
2) No, no problem ever. I would run 5w-20 or 5w-30 (living where I do) 5w-20 would be excellent for you.