Originally Posted By: b0ssh0gg
... I would rather go with Amsoil. I bought brand new so I could maintain it from the get-go with the best products...Also, does anyone NOT recommend using SeaFoam?? Friends have used it in the past, and it sounds good, but I'm still only 46k into my first car so I could be wrong..
At only 46k, and maintained as you described, you likely don't need anything to clean - the oil is doing the job for you.
Originally Posted By: b0ssh0gg
How much damage can actually be done from running higher viscosity oil than what Toyota recommends? While I do like good gas mileage, I feel like my driving habits don't totally correspond with the "green" 0w-20 choice. But, obviously, if 0w-30 is going to bunk up my car, then I would avoid it.
I've seen numerous posts on this board where:
A) xw30 is being run instead of xw20 and the UOA is very good and
B) xw20 is recommended in North America, but xw30 or ever higher recommended Europe or Australia.
So unless your engine has some changes from previous model years that require an xw20 oil you should be able to use it without an issue.
Living up north where you are, the 0w30 or 0w20 should be great, year round.