Motor oil 2uzfe and 3urfe

Hello,

Happy Thanksgiving.
Those with the 4.7 (Toyota recommended oil 5w30) and the 5.7 (Toyota recommended oil 0w20) and who might be a lazy c*nt like myself, what oil viscosity would you run for both?

I get all 4 seasons here so maybe running the 0w for the summertime in both and 5w for the winter. Thanks in advance.

 

I have the same dilemma here. The Tundra uses 5W-30 and the Acura uses 0W-20 motor oil.
I ordered some of each and had it shipped to my home at a fantastic price and it's stored until needed.
I like having supplies on hand before it's time to do the required maintenance.

 

0w is probably too thin for the 4.7 unless it is wicked cold there. Also, you would want the lighter weight in winter if switching.

where do you live? Winter for me is a 45 degree start. Nothing a 5wt can’t handle just fine.

 

I've run 0w-20 in my 4.7 for the last 30k with 10k changes. Oil analysis at 200k showed no issues.

 

My opinion is that both engine designs pre-date common specification of low viscosity oils (UZ/1989/10W40, UR/2006/5W30). My opinion is that neither design really required consideration of future oil viscosity...bwdik. The trend toward lower viscosity multi-vis motor oils is strictly about US fleet fuel efficiency. That, and the development of refining capabilities for producing low viscosity motor oil economically. Outside of the US, higher viscosity motor oils are routinely specified for UR engines. If I were in your place, it would be a no-brainer for the 5.7L (see below); use 5W30 in both vehicles.

Personally, I am not convinced that very low viscosity oil in reciprocating machinery is a good idea anyway. In turbomachinery, low viscosity oil has traditionally been used (SAE 10). In turbomachinery, the lubricating oil only has to create a hydrodynamic wedge to float the bearing journals, and continuously cushion the thrust bearing. In a reciprocating machine, like an internal combustion engine, there are constant rapid load reversals. The lower the oil viscosity, the easier for the cushioning film to be squeezed out. But, Toyota, et al, is accumulating experience with the application, and reliability seems unaffected.

I changed my Tundra to 5W30 in July, and plan to run it year around in Texas. My thinking is that in the Texas heat, SAE 30 viscosity will help prevent and reduce UR engine noise. If my truck lived outside in the winter, 5W still wouldn't hurt cold cranking. I don't really care about the effect of unmeasurable improvement in US fleet fuel efficiency by my changing.

 

The difference is in the cams. The 2uz-fe has those old school direct-contact solid lifters that rely on oil film strength to prevent cam wear. The 3ur-fe has roller bearing rockers

It's why when the 2nd gen Tacoma came out both were spec'd for 5w30 but the 2.7L 2tr-fe that has a valvetrain very much like the 3ur-fe was later rated for 0w-20. The better-selling 4.0L 1gr-fe with its solid lifters needed 5w-30 until it was retired in '15. The 1gr in the Tundra, 4Runner, and '10-up FJ were upgraded with roller bearing rockers and spec'd for 0w-20.

That said it's printed right in the newer Tundra manual that under harder working conditions a heavier oil may be desirable. Of course they don't specify which. For fun, look at the 4Runner owner's manual (on the toyota owners website) and the oil they say it needs if you drive in the U.S. vs the oil you can put in it when driving in Puerto Rico.