Originally Posted By: demarpaint
Originally Posted By: Gokhan
Originally Posted By: Spudislander
Which brand among the more popular 0W20 synthetics has a viscosity that should provide the best high temperature or heavy workload protection?
None.
Toyota owner's manual states that:
"The 20 in 0W-20 indicates the oil viscosity when the oil is at its operating temperature. An oil with a higher viscosity may be better suited if the vehicle is operated at high speeds, or under extreme load conditions."
It's easy enough to bump up a grade if the situation warrants. A 0W30 or 5W30 would be just fine. I noticed in some of the newer owners manuals they're allowing 5W30 in vehicles equipped with a fill cap stamped 5W20.
The 2015 Toyota 4Runner is this way. It says something like:
Use 0w20 for 10k or 1 year. A 5w20 can be used if a 0w20 isnt available, but a 0w20 must be used next time. You can go up a weight if the truck is used for towing.
I like the idea of going up a weight, but I wonder why they want you to go back to a 0w20 right after a 5w20 is used.