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0w20 vs 0w30 ? #5341467 02/05/20 02:59 AM
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Cheburashka Offline OP
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Hi!
Seems like many cars using 0w20 weight ...
For example if car specs require 0w20 but I want to use 0w30 at summer will it protect the engine better??
What if the main difference 0w20 vs 0w30 ?
Does 0w20 flow better ? I heard that thicker oil like Xw40 prtotect better ? Is the true ?


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Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341490 02/05/20 04:42 AM
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OilUzer Offline
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What kind of car are we talking about?

between the 3 that you have selected (0W20, 0W30 and 0W40) and a random passenger car, 0W30 would be more universal.

Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341491 02/05/20 04:44 AM
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Cheburashka Offline OP
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Highlendar 2018 3.5


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Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341518 02/05/20 06:32 AM
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OilUzer Offline
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I have a 0W20 Toyota Tundra and it's getting 10W30. It doesn't go below 20°F where I live.

If I lived in NY and to be on the safe side with a new car, i would ditch the 10W and use 0W30 in N parts and maybe even 5W30 in S parts. Guessing highlander is also 0W20 ... I think x40 would be too heavy.

short of major towing, heavy loads and/or high speed, 0W20 should work as well. Isn't that what your owners manual says? OM recommends higher viscosity grade under heavy load or high speed driving ...

Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341520 02/05/20 06:48 AM
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Cheburashka Offline OP
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Yeah iam not thinkg use a Xw40 ... I just saying for an example ... the higher the last number the ticker the oil..


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Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341536 02/05/20 07:23 AM
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krismoriah72 Offline
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This is how it was explained to me

The main reason 5W-20 or 0W-20 oil was specified for your engine is to increase the CAFE (Corporate Average Fuel Economy) reported to the Federal Government. CAFE is the combined average fuel economy of all of a vehicle manufacturers product line
.
Since I do not care about the Corporate Average Fuel Economy.. I never dip below 5w30 unless the oil is $1/qt on clearance.



To answer your question
The first number applies to how it flows at 0 degrees F and the second number is how it flows at 220 degrees F. Generally it's a good idea to have an oil with the smallest spread between the winter weight and operating weight as it will take more viscosity improvers in an oil with a large spread, even in synthetics to reach the operating weight the less it depends on viscosity improvers to reach it's wieght at temp, the longer it'll hold it's operating viscosity rather then shearing down to a thinner weight over time.

Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341537 02/05/20 07:23 AM
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Rat407 Offline
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0w-20 will be just fine.

Considering I'm running it in my 2002 Silverado 5.3. Back when in 2002 0w-20 wasn't even on the market. My UOA's are just fine and I even tow a 4klbs trailer. Also here in eastern NC it gets up into the upper 90's in the summer and the humidity is 90%.

To each their own but to me thicker isn't always better. There are more and more vehicles out there running 0w-20 and getting into the 100k plus mileage with no issues.


2002 Silverado 5.3 5w-20 AMSOIL
Re: 0w20 vs 0w30 ? [Re: krismoriah72] #5341544 02/05/20 07:29 AM
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Richie Offline
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My thoughts exactly

Originally Posted by krismoriah72
This is how it was explained to me

The main reason 5W-20 or 0W-20 oil was specified for your engine is to increase the CAFE (Corporate Average Fuel Economy) reported to the Federal Government. CAFE is the combined average fuel economy of all of a vehicle manufacturers product line
.
Since I do not care about the Corporate Average Fuel Economy.. I never dip below 5w30 unless the oil is $1/qt on clearance.



To answer your question
The first number applies to how it flows at 0 degrees F and the second number is how it flows at 220 degrees F. Generally it's a good idea to have an oil with the smallest spread between the winter weight and operating weight as it will take more viscosity improvers in an oil with a large spread, even in synthetics to reach the operating weight the less it depends on viscosity improvers to reach it's wieght at temp, the longer it'll hold it's operating viscosity rather then shearing down to a thinner weight over time.

Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341545 02/05/20 07:30 AM
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Tundra73 Offline
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Just use what your vehicle specs. If that is 0w20, then so be it. Regardless of what others tell you, your engine will last just as long.


2019 Toyota Tundra CrewMax 5.7 FFV V8 4x4 | Amsoil SS 0w-20 | Toyota OEM Oil Filter | 10,000 OCI
2017 Hyundai IONIQ | Amsoil SS 0w20 | Hyundai OEM Oil Filter | 10,000 OCI
Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341552 02/05/20 07:33 AM
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PimTac Offline
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5w30 is a product of CAFE.

Another dead horse thread trying to spout that “ticker” oil is better.


2017 Mazda CX5
Valvoline Advanced Synthetic 0w20
Roki OEM filter.
Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341553 02/05/20 07:33 AM
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ofelas Offline
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Unless one is in -40 consistently, I'd prefer 5w20 over 0w20, if only for the fact that most have less VIIs.


R12 in the summer, Webasto in the winter, and cassette tapes all year.
Re: 0w20 vs 0w30 ? [Re: PimTac] #5341557 02/05/20 07:44 AM
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aquariuscsm Online Content
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Originally Posted by PimTac
5w30 is a product of CAFE.

Another dead horse thread trying to spout that “ticker” oil is better.



Funny you mention that because you're correct. I remember when "10W30 engines" got back spec'd to 5W30 for fuel economy reasons aka CAFE.


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
Quaker State Ultimate Durability 0W20

Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341571 02/05/20 08:00 AM
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D1dad Offline
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I run maxlife 0-20 synthetic and have no complaints. I also picked up quite a bit of Mobil 1 Ap on clearance and the numbers on it are phenomenal. If you wanna run 5-30 I’d recommend PP which has always seemed very thin to me.

Re: 0w20 vs 0w30 ? [Re: ofelas] #5341619 02/05/20 09:21 AM
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ARCOgraphite Offline
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Originally Posted by ofelas
Unless one is in -40 consistently, I'd prefer 5w20 over 0w20, if only for the fact that most have less VIIs.


Agreed.

Whereas most 0w30 and 5w30 have the same KV100 and KV40

0W20 departs in ILSAC and ACEA A1 with the lower margin KV40 and allowed higher moly (teost FAIL allowance)
than 5W20.
5W20 EP and dexos are very close to lower margin xw30 grade.


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: 0w20 vs 0w30 ? [Re: Cheburashka] #5341638 02/05/20 09:47 AM
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ofelas Offline
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Not to mention a little lower NOACK, though I'm a bit hazy about what lowered values actually do in the real world.

Having said that, I *almost* considered 5w20 for a hot minute, before I chickened out & continued to use "thick" 5w30.

I couldn't see a compelling reason to choose the 5w20 over the 5w30, especially for a vehicle out of warranty.

My observations above were only with Amsoil's Signature Series gasoline oils, by the way, so not a comprehensive comparison of those grades in general, by any means.


R12 in the summer, Webasto in the winter, and cassette tapes all year.
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