CAFE Standards in the US and Oil Grades
- Thread starter johdirt784
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Fallacy and conjecture. When has a oil proven to add any meaningful power?
As for protection, it’s there.
I don't know. Can you please answer that one for me? You brought power and oil grade together two posts ago.
Me? I seem to be the one, but don't see the problem.
I'm more often editing than not. And don't necessarily stop even if I notice an answer to it in the meantime. Anyway, I never meant it as "ironic" and don't really see the problem here with me.
It's been against the law of nature in the last century when static compression ratios got reduced for emissions reduction and I don't see why it couldn't be against the law of nature once more now. If a reduction of power facilitated both at the same time – bingo. If power needed to be reduced for just making more efficient viscosity grades sufficient – still better than nothing. No power reductions at all? Mmh... (Just a finger twist of irony here.)
Motoring Public is much like BITOG as this dinosaur dancing its tricks on not much more than three distinct canisters. It will survive, won't it?
Adding the third variable kind of made it the first of those threads of the new generation
I'm more often editing than not. And don't necessarily stop even if I notice an answer to it in the meantime. Anyway, I never meant it as "ironic" and don't really see the problem here with me.
It's been against the law of nature in the last century when static compression ratios got reduced for emissions reduction and I don't see why it couldn't be against the law of nature once more now. If a reduction of power facilitated both at the same time – bingo. If power needed to be reduced for just making more efficient viscosity grades sufficient – still better than nothing. No power reductions at all? Mmh... (Just a finger twist of irony here.)
Motoring Public is much like BITOG as this dinosaur dancing its tricks on not much more than three distinct canisters. It will survive, won't it?
Adding the third variable kind of made it the first of those threads of the new generation
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Jackson_Slugger
$50 Site Donor 2022
Troll with 9 posts says wut?
As my mother would say, "What does that have to do with the price of cheese?"
I am legitimately curious why viscosities are spec'ed differently in different parts of the world. Carbon dioxide is not the only by-product of combustion and in the US, efficiency is further driven down by the 10% ethanol we use in our fuel since it is less energy-dense than gasoline hydrocarbons.
You make a good observation. The 4.0 in my 4Runner, for example, is specified for up to 20w-50 elsewhere in the world. 0w-20 here in the States.
For US vehicles, the owner's manual is required to list only the oil used in mpg testing. Some manufacturers get around this by saying a thicker oil may be required for adequate lubrication in heavy duty use. Words are mine, but the concept is in many manuals.
In some countries they specify thinner, in some they don't.
Agree that many or most vehicles vehicles will be totally fine with a 20 grade. However there is the fact that Ford moved from a 20 back to a 30 grade in their truck line.
Availability, cost and customer demand.
And it's a misconception that engine clearances are "designed for thinner oil" because when you look at bearing clearances for instance between an engine made in 2020 vs one made in 1980 they have the same design clearances for all practical purposes. That's why you can run anything from 0W-20 to 20W-50 in the same engine and it's not going to "blow-up".
Totally agree ... if there could only be one oil sold in the world it would most likely be 5W-30 or 0W-30.
Added engine wear protection instead of a hair more fuel economy when there's no CAFE to control what oil viscosity is used.
I have never noticed oil grade having any effect on fuel consumption. What I have noticed is fuel consumption varies noticeably depending on the size of the vehicle and/or engine, and the speed I travel at. Control of those variables will reduce national fuel consumption considerably....for those countries able to do so.
There are essentially two different 5W-30 Grades.
ILSAC GF-5/GF-6 & ACEA A5 = 2.9 HTHS min.
ACEA A3 = 3.5 HTHS min.
ILSAC GF-5/GF-6 & ACEA A5 = 2.9 HTHS min.
ACEA A3 = 3.5 HTHS min.
Vauxhall Owners’ Manuals | Car & Van Manuals | Vauxhall
We have a range of Vauxhall owner’s manuals for everything you need to know about your Vauxhall. Browse for your Vauxhall model and download the owner’s manual as a PDF.
For my 2017+.... Pages 288-290...
I dont see 0w20..... 0w&5w&10w....in sae30&40
Dexos1 or Dexos2 (for diesels)....those are usually coupled with at least MB 229.51 or bmw LL-04 over here....
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Good post jburg. I find this subject fascinating. I'm always comparing oil specs from other regions around the world to ours here. For example my Accord's Australian recommendations are 0W20-15W40. I meet it in the middle and use 10W30. I did a uoa with Pennzoil Platinum 10W30 and there were literally zero wear metals. The Acura TSX which has the exact same engine (just has a slightly hotter tune) as my Accord is spec'd for 5W30.
Oil grades are spec'd for the intended use of the vehicle. An economy car with the same engine that's fitted to an SUV or pickup truck will be spec'd with a different grade. Countries outside the US are slow to adapting lower grade oils. But they will. I suspect Americans put a lot more miles on their vehicles so fuel economy, and emmisions, becomes a priority with consumers, manufacturers and the government.
The United States is a far harsher climate than Europe so it is kind of silly to compare their choice of oil. Temperatures here range from 115F to -45F. It is a huge country. Many parts are extremely arid and dusty, while others are wet. Cherry picking an owners manual to claim that some other country's oil recommendation is right and your own country's is wrong, is unconvincing.
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