0W-20 in a 2uz for short trips?

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So I guess it works. Cheers 🥃
 
Oil advice can be a black hole of awfulness... so here we go.

You'd be better served running some sort of oil pan heater or engine block heater than changing the viscosity of your oil for short trips.

I would not want to go below a 30wt for the hot viscosity, personally. I want that protection when the engine is up to temp and I'm not trying to win any fuel economy challenges by going thinner.
I learned the hard way about oil pan heaters…I loaned a pickup to a family member, who to my ignorance left the pan heater always plugged in when not driving. In short, it quickly destroyed the oil life and caused compression ring failure in the pistons very quickly. I’d only plug that thing in 10-15 minutes prior to starting your motor and unplug it right at startup. IIRC, those pan heaters get up to 250-300 degrees, at least the one I had did.

On another note, one year I drove to Arizona from North Dakota, averaged 14-16mpg between fill ups. While in Arizona I changed all fluids (diffs, x-case and engine) to royal purple. I did this based on a propaganda video where they claim their product is better for cold starts as it coats the internals and they claimed improved fuel economy. On our return trip to ND, we averaged 18-20 mpgs between filling. I’m certainly convinced that a good lubricant can improve fuel economy.
 
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0-40 for me, but honestly just keep it full of oil. It's fine. The 2UZ is not a finicky and glorious Ferrari engine... unfortunately. :)

So it has been a year now, and I have driven only 2,500 miles, so I will keep it for 1 more year, oil looks good, no condensation .... however, I thought you might find this thread from 2010 interesting!

Tundra 2uz with 5w20, 13k miles had less wear than 0w40 with 10k miles. I have also seen a 1986 Corolla specd for 10w30 had less wear on 0w20 than 0w40.

Most people here have high mileage so I highly doubt they would use 20 grade, but I thought I share for reference 👍

1 year conclusion: 0w20 gives better mpg + faster warm-up, 0w30 gives me better engine braking, less braking application .. I will stick to 0w20 :)
 
Should send that 0w oil off to Blackstone Labs for analysis to see how much more internal component wear is happening compared to the suggested 5w..Otherwise its just speculation in mpg's
 
I saw/heard GM is advising to use 5W-30 instead of 0W-20 in their newer V8 engines. A lot of tahoes, suburbans, silverado's are blowing bearings with this 0w-20 . I plan to use 5W-30 in my newer 2024 Armada and 21 Tacoma which states to use 0W-20.
 
Should send that 0w oil off to Blackstone Labs for analysis to see how much more internal component wear is happening compared to the suggested 5w..Otherwise its just speculation in mpg's
I wasn't too motivated to do it after looking at the findings attached in post #23, maybe next time ...
"Tundra 2uz with 5w20, 13k miles had less wear than 0w40 with 10k miles. I have also seen a 1986 Corolla specd for 10w30 had less wear on 0w20 than 0w40."
tapping seems to go away after warm-up or maybe I am just imagining things ..
 

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