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Mobil1 0w20 in the 5.7L WK?

6K views 14 replies 11 participants last post by  lewi3069 
#1 ·
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 .....
 
#3 ·
Should be fine with MDS...also better in the colder temps.
 
#4 · (Edited)
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.
 
#6 ·
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.
 
#10 ·
Really it should get to operating lubrication faster since it starts at a closer range than 5w will. If that makes sense...
 
#9 ·
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. :thumbsup:
 
#15 ·
Yea... I don't really know what I was getting at... Yesterday I had a slow start lol
 
#12 ·
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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