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Old 10-02-2010, 07:55 AM
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Mobil1 0w20 in the 5.7L WK?

Anybody try running the 0w20 M1 in there 5.7L Hemi? My usual supply shop was all out of the 5w20 yesterday and was running a special on the 0w20 (free M1 filter with 5 qts) so I picked up 7qts for the oil change today. Figure worse thing that can happen is it gives the MDS fits and I have to turn it off for the next 5k miles.

Bottle claims it meets 5w20 OEM requirements and is supposed to give better mileage. Only time will tell .....
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Old 10-02-2010, 08:21 AM
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Re: Mobil1 0w20 in the 5.7L WK?

Tell us how that goes!!!!
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Old 10-02-2010, 08:56 AM
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Re: Mobil1 0w20 in the 5.7L WK?

Should be fine with MDS...also better in the colder temps.
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Old 10-02-2010, 10:57 AM
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Re: Mobil1 0w20 in the 5.7L WK?

You'll be fine with it. I've run it once, but my supplier normally doesn't carry it. I didn't notice any difference. Some folks in the LX (Charger, 300C, Magnum) community say it works even better. Being that your in cold country should also be a plus. Let us know what you think.
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Old 10-02-2010, 06:37 PM
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Re: Mobil1 0w20 in the 5.7L WK?

I thought they were really adamant that only 5w20 would work with the MDS. not that it really matters because I only get 15-16mpg anyway. I'm curious about this as well because I usually ran 0w20 in the winter in my Mustang and my STI.
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Old 10-03-2010, 05:36 PM
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Re: Mobil1 0w20 in the 5.7L WK?

When you run a heavier oil than 5W-20 is when there are problems with the MDS. When I bought mine the dealer was proud to announce that he had done me a favor and changed the oil. Only problem is they put 10W-30 in it and the MDS worked like crap, seldom coming on at all. Had I not had another Hemi equipped vehicle, I would have probably just shined it on. After changing to synthetic 5W-20 a week later it started working like the MDS in my other vehicle.
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Old 10-04-2010, 10:00 AM
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Re: Mobil1 0w20 in the 5.7L WK?

Since it's 20 weight at operating temps, there should be no difference with the 0-20 formula.
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Old 10-04-2010, 07:18 PM
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Re: Mobil1 0w20 in the 5.7L WK?

i've been running 0-20w amsoil in mine w/o any probs.
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Old 10-04-2010, 07:39 PM
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Re: Mobil1 0w20 in the 5.7L WK?

I took the WK on a 200mi round trip today (mostly highway miles) and didn't really notice any difference in the operation of the MDS.
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Old 10-05-2010, 10:15 AM
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Re: Mobil1 0w20 in the 5.7L WK?

Quote:
Originally Posted by Jim Hef View Post
Since it's 20 weight at operating temps, there should be no difference with the 0-20 formula.
Really it should get to operating lubrication faster since it starts at a closer range than 5w will. If that makes sense...
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Old 10-05-2010, 11:45 AM
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Re: Mobil1 0w20 in the 5.7L WK?

I stated at operating temps, meaning that the engine was fully warmed, and that the viscosity would be at 20 in that condition. Not when starting the vehicle.
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Old 10-05-2010, 12:55 PM
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Re: Mobil1 0w20 in the 5.7L WK?

for the cooler weather it will be fine Joe. In my XJ, 130K miles all mine. 5/30 tax day to election day. 0/30 election day to tax day.

Our avg low here is already 39. 2-3 weeks and it'll be below freezing. The 0 starts right up in the cold. and I get the /30 for normal operating temps.

the 4.7 Wk get 5/20 and 0/20

Chrysler LOWERED the top number viscosity for the MDS cause the 30 didnt get thin enough and caused flutter of the MDS.
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