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Why does Toyota recommend 0W-20? #5236811 10/11/19 10:14 AM
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wallyuwl Offline OP
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Why does Toyota recommend 0W? Most are 5W. In the manual it says 5W is OK if necessary, but that it should be changed to 0W the next oil change. I have a stash of 5W-20 that I plan to use. Are they going for increase MPG, or think that this little bit thinner oil might reduce start-up wear a bit?

Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236815 10/11/19 10:18 AM
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benhen77 Offline
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I think some of it is gas mileage and start up wear in extreme conditions.

The other factor I think is that 0w20 is, with few exceptions, always full synthetic. It's their way of knowing that the oil in it is able to withstand the extended drain interval they recommend.


2012 Kia Forte EX 2.0 I4 6AT 49k- Valvoline Synpower 5w20
1994 BMW 530i, 5MT 201k M1/Castrol 0w40
2009 Honda Accord 2.4 I4, 5AT, 178k- RP 0w20
2004 BMW X5 4.4l 239k- M1 0W40 FS
Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236821 10/11/19 10:22 AM
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billt460 Offline
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Mine say's pretty much the same. I'm having trouble finding 0W-16 both here, and when I was in Phoenix. So I used 0W-20. You're in Wisconsin and Winter is on it's way. So I'm guessing you will have an easier time finding it than I have. As far as why they're recommending it? There will be around 6 pages of posts coming along shortly, giving you the answer to that. Just make the popcorn and wait. popcorn

Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236822 10/11/19 10:23 AM
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Leo99 Offline
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how big is your stash?


Without data you're just another person with an opinion. W. E. Deming


2004 Corolla 125,000 miles
2004 Rav4 399,852 miles (RIP)
2015 Camry 101,000 miles
2020 Rav4 6,000 miles
Re: Why does Toyota recommend 0W-20? [Re: benhen77] #5236825 10/11/19 10:25 AM
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kschachn Offline
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Originally Posted by benhen77
I think some of it is gas mileage and start up wear in extreme conditions.

Reduced fuel consumption, yes. Reduced wear, no.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Why does Toyota recommend 0W-20? [Re: kschachn] #5236828 10/11/19 10:26 AM
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Richie Offline
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my thoughts as well. I know my Tundra in the US calls out to use 0W-20 but the same truck and engine in other countries calls to use 5W-30

Originally Posted by kschachn
Originally Posted by benhen77
I think some of it is gas mileage and start up wear in extreme conditions.

Reduced fuel consumption, yes. Reduced wear, no.

Re: Why does Toyota recommend 0W-20? [Re: kschachn] #5236837 10/11/19 10:33 AM
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benhen77 Offline
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Originally Posted by kschachn
Originally Posted by benhen77
I think some of it is gas mileage and start up wear in extreme conditions.

Reduced fuel consumption, yes. Reduced wear, no.

Are you suggesting that Toyota doesn't care about wear, or that a 0w20 is not objectively better than a 5w20 in extremely cold climates?


2012 Kia Forte EX 2.0 I4 6AT 49k- Valvoline Synpower 5w20
1994 BMW 530i, 5MT 201k M1/Castrol 0w40
2009 Honda Accord 2.4 I4, 5AT, 178k- RP 0w20
2004 BMW X5 4.4l 239k- M1 0W40 FS
Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236839 10/11/19 10:35 AM
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nomas Offline
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My Nissan Titan manual calls for 0W-20 . No other options .

Re: Why does Toyota recommend 0W-20? [Re: kschachn] #5236842 10/11/19 10:38 AM
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aquariuscsm Offline
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Originally Posted by kschachn
Originally Posted by benhen77
I think some of it is gas mileage and start up wear in extreme conditions.

Reduced fuel consumption, yes. Reduced wear, no.


^^What kschachn said.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum High Mileage 10W30

Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236843 10/11/19 10:40 AM
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Reddy45 Offline
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I think the 0w20 change coincided with them spec'ing 10k OCIs.

But my suspicion is they are caught between a rock and a hard place:

- Toyota reliability is still their core reputation, and as a result they can't be too innovative with their power trains. The top sellers like the 4Runner are using the exact same drivetrain from a decade+ ago.
- Older power trains just aren't all that efficient, or rather they aren't built around the concept of squeezing efficiency out of pump gas. (in contrast, see Ford who keeps making turbo engines that get really impressive MPG numbers)
- 0w20 is a way to bump up those CAFE numbers so they can either pay no penalties or less penalties for non-compliance

Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236847 10/11/19 10:43 AM
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WylieCoyote Offline
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They care just enough about wear to make it through 5/60


2015 Canyon 3.6
2018 Mustang Ecoboost Convertible
2017 Focus ST
Re: Why does Toyota recommend 0W-20? [Re: benhen77] #5236848 10/11/19 10:45 AM
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kschachn Offline
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Originally Posted by benhen77
Are you suggesting that Toyota doesn't care about wear, or that a 0w20 is not objectively better than a 5w20 in extremely cold climates?

A better winter rating helps to allow the engine to start at colder temperatures. It improves cranking and helps to prevent oil gelling near the pickup tube. it does not reduce wear. Wear is influenced by the MOFT which is adequate in any oil at startup. All motor oil is thick at ambient temperatures.

Once again, 0W rated oil is not "thin". Wear is influenced by the other number in the grade, not the winter rating.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Why does Toyota recommend 0W-20? [Re: kschachn] #5236856 10/11/19 10:54 AM
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benhen77 Offline
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Originally Posted by kschachn
Originally Posted by benhen77
Are you suggesting that Toyota doesn't care about wear, or that a 0w20 is not objectively better than a 5w20 in extremely cold climates?

A better winter rating helps to allow the engine to start at colder temperatures. It improves cranking and helps to prevent oil gelling near the pickup tube. it does not reduce wear.

Not sure I follow... If that oil gels, and you turn over the engine, would it not wear more than an engine where the oil didn't gel?


2012 Kia Forte EX 2.0 I4 6AT 49k- Valvoline Synpower 5w20
1994 BMW 530i, 5MT 201k M1/Castrol 0w40
2009 Honda Accord 2.4 I4, 5AT, 178k- RP 0w20
2004 BMW X5 4.4l 239k- M1 0W40 FS
Re: Why does Toyota recommend 0W-20? [Re: benhen77] #5236859 10/11/19 10:59 AM
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kschachn Offline
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SAE J300 (and ASTM D4684) addressed a very specific issue where wax crystallization caused the oil to form a cavity around the pickup tube and prevent pumping. It illustrated a problem with the old pour point test. The oil is not gelling in the bearings or on the camshaft lobes but potentially in the sump.

And sorry I added a bit of detail to my original post later on.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Why does Toyota recommend 0W-20? [Re: wallyuwl] #5236871 10/11/19 11:17 AM
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PimTac Offline
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The number zero just freaks some people out.


2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
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