0W-40

[il_signore97]

I think Hyundai simply suggests 5W40 because it is a well recognized grade, easy for people to find, and is far more popular than the 0W40 options. They likely do not exhaust the possibilities of grades to keep it simple for owners and not leave them with an overwhelming amount of choice.

However, from a technical standpoint, assuming a 0W40 oil is of high quality and resistant to shear, then no, there will be no issue with using it in place of a 5W40. M1 0W40 is approved alongside many 5W40's in many different applications. In theory, a synthetic 5W40 or 10W40 might be more shear resistant than a 0W40, but in practise, the difference (if any) likely does not even come into play, especially for a daily driver.

 

[artificialist]

If you ever had an engine problem with 0w40, the engine oil would probably be analyzed.

However, I don't read of anyone lowering the temperature of oil and using the cold crank simulator to determine if it is a 0wXX or a 5wXX oil. I only read of used oil being tested at 40C and 100C, and the difference between 0wXX and 5wXX would not be visible.

 

[wemay]

Originally Posted By: artificialist
If you ever had an engine problem with 0w40, the engine oil would probably be analyzed.

However, I don't read of anyone lowering the temperature of oil and using the cold crank simulator to determine if it is a 0wXX or a 5wXX oil. I only read of used oil being tested at 40C and 100C, and the difference between 0wXX and 5wXX would not be visible.


This is a very interesting point!

 

[richport29]

Castol's 0W40 lookspretty impressive, based on it's PDS (As limited as Castrol can be on these)
The pour point is especially impressive. It would have to have a high dose of PAO to pull those numbers off, one would think.

 

[Swift101]

Originally Posted By: artificialist
If you ever had an engine problem with 0w40, the engine oil would probably be analyzed.

However, I don't read of anyone lowering the temperature of oil and using the cold crank simulator to determine if it is a 0wXX or a 5wXX oil. I only read of used oil being tested at 40C and 100C, and the difference between 0wXX and 5wXX would not be visible.


Yeah you make a good point. I think 0W-40 might be worth a shot.

My girlfriend's mom had a problem with her 2010 Santa Fe (55K ODO). She noticed it was making a ticking/knocking noise. She took it to the dealer and it turned out it was the crankshaft. It was replaced under warranty.

Now here comes the interesting part. The dealer NEVER asked for any records regarding oil changes. She always goes to a local tire shop to get her oil changed (3-4K OCI), they use bulk 5W-20 and some generic filters. But she often looses the receipts and doesn't keep a maintenance log .

I guess the techs who took apart the engine saw that it had been taken care of. They probably didn't ask to see any receipts because everything seemed normal. I'm guessing if you show up with a sludged up engine trying to make a claim, that's when they start asking for records.

In the unlikely event that I would experience engine failure, I doubt the dealer would come asking for every oil receipt. Say if a particular engine component fails, but the rest of the engine look immaculate, I don't think they would start asking questions. I could be dead wrong to assume this to be true, but dealers operate differently.

 

[wemay]

...and just to add something along those lines, My Walmart reciepts only say the brand name of the oil purchased, not the viscosity (when paying at the sporting goods register). At the main registers, it does say the viscosity.

 

[Swift101]

Originally Posted By: wemay
...and just to add something along those lines, My Walmart reciepts only say the brand name of the oil purchased, not the viscosity (when paying at the sporting goods register). At the main registers, it does say the viscosity.


That's interesting, I remember I was buying oil for my mechanic. I picked up 2 jugs of M1 5W-30 and 2 jugs of M1 0W-20. The cashier couldn't get the bard-code to scan on the 5W-30 jugs for what ever reason. Instead he scanned the M1 0W-20 4 times, I'm not saying anyone should try to scam their car manufacturer though. I keep a log of my oil changes and receipts as well.

 

[wemay]

I must say, all this discussion of 0w40 also has me contemplating its use in the future.

 

[Swift101]

Originally Posted By: wemay
I must say, all this discussion of 0w40 also has me contemplating its use in the future.

Tell me about it, I'm going to give it a shot after after my current fill.

 

[M6ser]

Would M1 0-40 or Castrol 0-40 protect better in hotter climates ?

 

[gixxersix04]

I use 0w-40 on my sonata. 12K miles and not a single issue.

 

[Swift101]

Originally Posted By: gixxersix04
I use 0w-40 on my sonata. 12K miles and not a single issue.


Good to know

thanks for the feedback

 

[KrisZ]

Originally Posted By: gixxersix04
I use 0w-40 on my sonata. 12K miles and not a single issue.


Why would there be an issue?

It may come as a surprise to a lot of "the sky is falling" posters when out of spec oil is used, but I can't recall anything ever mentioned on BITOG that would objectively blame oil viscosity for engine failure.

 

[Clevy]

Originally Posted By: M6ser
Would M1 0-40 or Castrol 0-40 protect better in hotter climates ?


They both carry Porsche approval and certification and therefore Porsche believes them to be equal.
And they are the same grade so to be honest to call one better than the other in a specific climate would be at best splitting hairs.

 

[Clevy]

Originally Posted By: KrisZ
Originally Posted By: gixxersix04
I use 0w-40 on my sonata. 12K miles and not a single issue.


Why would there be an issue?

It may come as a surprise to a lot of "the sky is falling" posters when out of spec oil is used, but I can't recall anything ever mentioned on BITOG that would objectively blame oil viscosity for engine failure.



No kidding.

I'm running a thicker oil in my charger in the summer for 1 reason and 1 reason only,operating conditions.
I get the oil up to 260+f often and I'm more comfortable with the added headroom allowed using a thicker grade.
Winter I drive the car normal,rarely exceeding the speed limit and only really revving it during the ITU prior to oil change.
Unless really heating up the oil I see no point in going thicker in a passenger vehicle.
Just my opinion.

 

[gixxersix04]

No issues with the dealership using 0w-40 is what I meant.

 

[wemay]

Originally Posted By: gixxersix04
No issues with the dealership using 0w-40 is what I meant.


Interesting... One dealership gives me a hassle and the other does not. I guesll i will be visiting only one from now on.