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5w20 synthetic for me too.

I would like to run a 5w30 as I’ve seem some valvetrain wear issues on the Hemi, but I don’t want to interfere with MDS.
Plenty of people run 5w30 or 0w40 (like the 6.4, which also has MDS) with no issues. The 5.7 and 6.4 share the same MDS solenoids and lifters.


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Plenty of people run 5w30 or 0w40 (like the 6.4, which also has MDS) with no issues. The 5.7 and 6.4 share the same MDS solenoids and lifters.


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That's interesting. I hadn't considered 5w30 or 0w40. 5w30 is the recommended oil for a couple of my other vehicles. I have my ECO mode shut off most of the time anyway. I'll probably stick with 5w20 full synthetic while under warranty though.
 
Been running 5w20 full synthetic in both my 2008 Limited and 2013 Citadel Hemis since I've owned them (used). No problems with MDS operation.
 
I use the Amazon stuff in 5w-20. It meets the specs.
Not to badmouth Amazon, I purchased Penzoil Ultra Platinum from Amazon , trying to open the cap could not by hand. Did not feel wright, I used pliers and it was crunchy as I opened it and guess what was inside the 5 quart container "the oil inside was darker than what I had in my engine". Not Amazons fault but could not believe somebody would go that low and return used motor oil and somebody ends up buying it. Got refunded but no more on line oil purchase for my vehicles.
 
I ran 5w20 in my 05' 5.7 Hemi but no MDS for about 150,000 miles then switched to 5w30. She ran like a champ until the day I traded her in on my new DD, she had almost 300K.

Always a strict diet of Mobile 1 fully synthetic and quality extended oil filter. I change the oil on all my cars once every year regardless of milage.

Also, Walmart or Autozone with coupon have the best prices on the case.
 
Honestly, full synthetic (fs) is the way to go. Have been using mobile1 FS for decades. Currently w Citadel having 160k mi. Also Ford Expedition w 278k mi prior that traded for the Citadel. And prior to that Z28 IROC Camaro that donated to Childerns Hospital in perfect working condition with 294k miles.
 
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