My 2006 Jeep with the 5.7 liter Hemi(sweet)requires 5W-20 for the MDS to work right.If I use 0W-20 which meets Chrysler spec MS-6395 would I be voiding the warrenty?Joe
0W-20 warrenty concerns
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The Amsoil site says:
1. Vehicles with the 5.7 Multiple Displacement SYS (MDS)
must use SAE 5W-20 oil. Failure to do so may result in
improper operation of the Multiple Displacement SYS (MDS).
So I would say yes IF AS BY LAW they can prove the 0W20 directly caused the failure. However contact the manufacturer and ask. You can also contact the oil manufacturer to see if they will warranty for this application.
1. Vehicles with the 5.7 Multiple Displacement SYS (MDS)
must use SAE 5W-20 oil. Failure to do so may result in
improper operation of the Multiple Displacement SYS (MDS).
So I would say yes IF AS BY LAW they can prove the 0W20 directly caused the failure. However contact the manufacturer and ask. You can also contact the oil manufacturer to see if they will warranty for this application.
Nope. 0W-20 meets all 5W-20 specifications and could be labelled as 5W-20.
I think that means DO NOT use a thicker oil. 0w-20 will be fine, as rpn453 said, it meets all the requirements.
Amsoil 0w-20 is a recommended replacement for 5w-20 and competitor's 0w-20. Same goes for Mobil 1 0w-20.
The Xw, only means it passed a cold cranking test at X degrees with an X cP rating. This does not reflect the operating temperature's viscosity.
Amsoils 0-20 borderlines a 30wt with cSt. If it thickens a tad, would it make your system fail? If any 5-20 thickens to a 30weight, would your system fail?
How could an oil analyser or dealer tell if a used 0-20 was a 20 weight or 30 weight....? or a 0, 5, or 10w 20 or 30 weight?
Experts....? thoughts?
How could an oil analyser or dealer tell if a used 0-20 was a 20 weight or 30 weight....? or a 0, 5, or 10w 20 or 30 weight?
Experts....? thoughts?
Why not follow what the mfg. calls for? I have the 5.7 in a Dodge 1500 quad cab. I use the 5w20 with no problems.What is there to gain w/ the 0w20?
I've used 0w20 M1 in my Mazda6, which specs 5w20, and i've found my duratec to love the 0w better than the 5w. For some reason the engine seems to run smoother.
I too have concerns about using a 0W-20 where a 5W-20 is specified. My F150 requires 5W-20. Is it possible to be too thin at startup?
How could they possibly distinguish one from the other with the overlap in specs for each viscosity range?
Patman
Staff member
I really don't think it is possible to have an oil that is too thin at startup. The thinner the better. So any engine which calls for a 5w20 can most certainly run a 0w20 with no issues whatsoever.
I second that. The oil will always be much thicker at cold start-up than at operating temperature. The closer the oil is to ideal operating conditions, the better.
I think Chrysler's concerns are more about people using something really thick like a 20W-50. 5w30 would probably work fine, but leave you with less of a safety margin in cold temperatures when everything runs a little cooler.
As long as the oil falls into the 20 weight range when hot what's the problem?
Whimsey
Whimsey
If you look at the viscosity of both oils at startup and the temperature is above zero there might be as much of a difference betweens brands of exactly the same labeled viscosity as there is between any 0w-20 and a 5w-20 labeled oil. I think you could therefore use 0w-20 and still find the love of your life, get married and live a happy ever after, have lots of children and buy a house. If you're half as picky about the rest of the maintenance as your are about the choice of oil viscosity you will make the second owner very happy. By the way a very good 5w-20 oil has been popping up on sale now and then, Motorcraft.
well experts, id like to know too
No expert here, but I'll throw in some thoughts.
I don't think the system is as picky about oil viscosity as many are making it out to be. That is, running 5w30, or even 5W-40, would likely never cause a problem. Oil temperature is not regulated, so 5W-20 with an ambient temperature of -40F is going to be much thicker than 5W-20 on a 105F day under operating conditions that are otherwise the same, even when the engine is warm. Obviously, either situation is fine or the engines wouldn't work in Canada. The oil viscosity will also be affected by driving style, since the oil will run much hotter under hard driving.
I'm not trying to say that MDS Hemi owners should stray from the recommendations; I'm just saying that there's no way that tiny viscosity differences between XW-20s are going to eat up the safety margins that Chrysler's engineers incorporated in the system.
I'm not sure Chrysler engineers purposefully incorporated a safety margin of a wider range of viscosities than the stated "recommended" viscosity, what I think is that there is more likely a serendipitous safety margin.
That's probably a more accurate way to put it!
Well I will bump this back up to the top....this post has merit and needs clairification by some experts in the field.
The switchable valvetrain systems out there were not made by the OEM's but by one of 3 suppliers, Hitachi, INA, Eaton. All 3 spec 5w20 because they believe it takes a minimum 5w oil to make the system work correctly. If you use 0w20 you may be fine but maybe not.....one thing for sure is that you wouldn't want to get stuck with the repair bill one one of those systems. BTW, ALL of these suppliers are well aware of 0w oils because they are widely used in Europe.
A 5W oil instead of a 0W oil means it wont thicken as much when your car is an ICE CUBE. Beyond that they are very very close. They are both the same at temp. So what would be different. Have we not seen that in analysis after analysis and Spec Sheet after Spec Sheet around here.
Pretty much a dead horse. A 5W-20 and 0W-20 are the same (within reason of the allowed "weight" category) at temp. Could a 40 weight mess it up sure. Could a 20 weight mess up a diesels injectors, sure. But within same weight category non-issue.
Use with confidence.
Pretty much a dead horse. A 5W-20 and 0W-20 are the same (within reason of the allowed "weight" category) at temp. Could a 40 weight mess it up sure. Could a 20 weight mess up a diesels injectors, sure. But within same weight category non-issue.
Use with confidence.
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