Other than the weight what is different about the 5-20 spec oil for Honda, Ford etc. over 5-30 oil?
What makes the Ford, Honda and Chrysler 5-20 spec.
- Thread starter thinshavings
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Since the advent of SM/GF-4, very little except for viscosity, and even that change is much smaller than the monikers imply.
Here is Ford's own explanation. 930-A Spec
And what's the main driver for recommending 20 over 30, or vice versa? Does it have to do with engine tolerances or something else? I've always wondered this.
Lots and lots of very heated debates have circled around this question.. There really is no 1 reason in my eyes, or that i can remember from all the debates. Many will simply point the finger at CAFE and say its for fuel economy reasons, because other places in the world still recommend heavier oils. I think it's because here in the US, we have the ability to produce a solid motor oil that will protect your engine just as well as heavier weights, while giving the added bonus of better fuel economy.
Take this with a grain of salt though, because i don't claim to be an expert on the subject.
one more vote for CAFE, many engines recommand 20 weight in US recommand heavier oil outside US.
Kitto, I recommend you be careful slinging that statement around, many on this board will take offense to it.
Now, while the reasons for moving to a 20 weight oil are arguable, the one thing that is not, is their performance. the current SM rated 20 weight oils are doing a great job at providing protection for the engines that are speced for them.
Now, while the reasons for moving to a 20 weight oil are arguable, the one thing that is not, is their performance. the current SM rated 20 weight oils are doing a great job at providing protection for the engines that are speced for them.
People that take offense to it, really need to lighten up.. It's only oil
I think the reason is fuel economy. Luckily oil has come a long way and xW-20 is protecting these engines just as good as a thicker oil would.
Even my old '96 Audi can use 5W-20 when it's cold
(according to the oil chart in the manual)
I think the reason is fuel economy. Luckily oil has come a long way and xW-20 is protecting these engines just as good as a thicker oil would.
Even my old '96 Audi can use 5W-20 when it's cold
What about engine tolerances/clearances? I'm probably showing my ignorance, but is there evidence that engines have tighter tolerances now and lower viscosity oils are more necessary to keep op and wear down?
Just asking...
Just asking...
I thought it was just a slightly different philosophy in how to lubricate a bearing/surface. Basically they are just trying to increase flow across the bearings so the residual heavier oil is not required.
Yes, as manufacturing technologies improved over the years, clearances and/or tolerances have gotten tighter. Further, surface finishes have improved, and coatings have been employed. Many valvetrains have also been rollerized. Fuel injection and upgraded ignition systems can help minimize fuel dilution. And finally, PCMO oils have improved in their performance, especially in areas beneficial to modern engine designs.
Finally, one must realize that the change in viscosity is a lot less than the moniker implies. Going from a 5w30 to a 5w20 is roughly going from 10.5 cSt to 8.5 cSt at operating temperature, a ~20% change in values, not ~33%.
claim down, it has many posts on this forum regarding 20 weight oil, other than the search function is not useful right now.
I still remember reading a post that police fleet on their Ford having problem after switching to 5W20 in one state.
here is one example on JDM accord-inspire.
user manual: http://www.honda.co.jp/manual/inspire/2006/pdf/2006-inspire-spec.pdf
on page 407, Honda recommard 0W20, 5W30 and 5W40 for Accord.
it clearly say that 0W20 can achieve best fuel ecomony.
user manual: http://www.honda.co.jp/manual/inspire/2006/pdf/2006-inspire-spec.pdf
on page 407, Honda recommard 0W20, 5W30 and 5W40 for Accord.
it clearly say that 0W20 can achieve best fuel ecomony.
Total bunk. We have an email from the editor of Police Fleet Magazine addressing this exact issue.
Here's that manual translated:
Note that it makes no other comment than which oil gives the best fuel economy. Period.
Further, we have many dozens of UOAs that provide overwhelming evidence that 5w20s are providing just as good of protection as any other grade in the vehicles that spec them.
Here's but a recent one, with towing included to boot.
http://theoildrop.server101.com/forums/s...7050#Post757050
You guys who keep questioning the efficacy of 5w20s should use your time more productively and join something like the Flat Earth Society.
Note that it makes no other comment than which oil gives the best fuel economy. Period.
Further, we have many dozens of UOAs that provide overwhelming evidence that 5w20s are providing just as good of protection as any other grade in the vehicles that spec them.
Here's but a recent one, with towing included to boot.
http://theoildrop.server101.com/forums/s...7050#Post757050
You guys who keep questioning the efficacy of 5w20s should use your time more productively and join something like the Flat Earth Society.
Quote:
Here's that manual translated:
Note that it makes no other comment than which oil gives the best fuel economy. Period.
Further, we have many dozens of UOAs that provide overwhelming evidence that 5w20s are providing just as good of protection as any other grade in the vehicles that spec them.
Here's but a recent one, with towing included to boot.
http://theoildrop.server101.com/forums/s...7050#Post757050
You guys who keep questioning the efficacy of 5w20s should use your time more productively and join something like the Flat Earth Society.
ok, if you don't like my opinion on CAFE, that's fine to me. I don't want this post to be locked for continuing arguing.
I try my best to translate from Japenses to English and I don't see that little inaccuracy will make any different. And I think the word "superior" is not even better than the word "best".
Also, only 0W20 give the superior economical fuel economy which means from 0W20, 5W30, 10W30, 5W40, 0W20 give the BEST fuel economy within these four grade.
Kitto, nothing personal, but you're like the 1,001st guy to bring up CAFE and JDM manuals. The only thing they serve to do is to provide a leap off point into all kinds of speculation and false conclusions based on weak implications.
The evidence is so simply overwhelming at this point it is fruitless to keep bringing up the same crapola over, and over, and over again.
The evidence is so simply overwhelming at this point it is fruitless to keep bringing up the same crapola over, and over, and over again.
let me chime in here. most oils have changed like cars. they have a newer barrier lube and protects the engine very well. the old 50wt oil was used to protect the engine as it took longer to squeeze out and acted like a barrier lube does. so it protected the engines also. now adays, it is a combination of cafe and protection. better fuel mileage and protection.
Hey Bob! Good to see you up and about.
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