First thing, if your Hemi powered car/truck is still under warranty, I recommend taking it to the dealer. Hopefully they will fix it for you but if they don't, at the very least it will be documented. If they essentially blow you off like they did to
me, continue reading.
For a lot if not most people, the 5.7 Hemi is a nice smooth running engine with any oil thats put in it. For others the 5.7 Hemi has a pretty loud tick either on startup or after its completely warmed up. Not to be confused with a broken exhaust manifold bolt(s),
this is a metal on metal tick that comes from the internals of the engine, most likely from the lifters although thats never
been proven 100%.
My 2013 Ram 1500 developed a loud tick at a fully wamrmed up idle around 2500 miles when I drained out the PYB 5w20 that was in
it and put in PP 5w20. The motor sounded absolutely horrible, you literally could hear all the metal componants hitting against
each other. Now I believe PP is a fantastic oil, it just didn't agree with my Hemi. Because it got was such a drastic change
right after an oil change, over the next few years I tried many different oils including PYB 5w20, PUP 5w20, Amsoil OE 5w20,
Amsoil SS 5w20 and 5w30, Redline 5w20/5w30/0w30, Mopar 5w20 from the dealer which is either PYB or PG. The only two oils that
made a difference in how it sounded were PYB 5w20 which minorly quieted it up. For a complete list of the oil changes I did up
until the summer of 2017 check this post out: Oils used and Mileage
After taking my truck to the dealer 3 times and 3 times being told it was "normal Hemi noise" I had given up. It was
either live with it ticking like it was going to grenade or find my own answers. After spending many hours researching different oils, I
figured I'd give Redline oil a shot because there were claims that it quiets Hemi's as well as many different engines. I figured
there was nothing to lose except some money.
First I tried Redline 5w20. It helped but the tick was still there. Then I tried Redline 0w30 because at the time I was nervous about
running a 30 weight oil in an engine that was spec-ed by the manufacturer for 5w20. It was also winter so I went with a 0w. 5w20 vs 5w30 in a 5.7 Hemi is a whole other discussion, long story short, you can run a Xw30 oil in a 5.7 Hemi with absolutely no MDS problems and no codes thrown. This has been proven many times. Anyways Redline 0w30 made it quieter than Redline 5w20, but the ticking was still there to a point at hot idle.
Then I tried Redline 5w30. On paper it looks fantastic compared to their 0w30, mainly a high HTHS of 3.7 for a 30wt oil. Each time I ran a Redline oil I gave it a good 500+ miles for the high moly in Redline oil to plate to all high contact surfaces in the engine. Here's a
video documenting how quiet my truck is on Redline 5w30. Pay particular attention from 39 seconds to 1:03.https://youtu.be/89_9ZDBdmss
After confirming an oil alone can quiet my Hemi, I decided to try the new formula Amsoil SS 5w30 since it now has 225+ ppm of
moly. It can be had cheaper than Redline so if it worked like Redline I can save some money. 500 miles into new formula SS 5w30,
it started developing the hot idle tick again shown in this video:https://youtu.be/CjMDKz1yZLI
This is what it sounded like when I put PP 5w20 in it, except with PP it was easily twice as loud. If I went through a drive
thru I would have to shut the truck off to be able to hear anything. It was that bad. I ended up draining out the SS 5w30 and
put Redline 5w30 back in. I only have about 100 miles on that oil so its still a little loud but not as loud as it was on SS
Let me reiterate, I believe both PP and SS are great oils. Many people run them in 5.7s with great results. I currently run SS
0w20 in my wifes 2017 Jeep GC 3.6 and it runs very smooth and quiet.
A couple other oils that may quiet a Hemi are Schaefers and Motul. Both have high moly but keep in mind simply having an oil
with high moly such as new formula SS doesn't necessarily mean its going to quiet a Hemi. I believe PAO/Esters and a high HTHS
are also required. Maybe even the higher zinc in Redline has something to do with it.
So if you have a ticking Hemi give Redline 5w30 a shot. If you're worried about running a 5w30 in your 5.7, try Redline 5w20.
Redline 5w20 has worked for some, but didn't quiet mine up as much as Redline 5w30.
When I get 500+ miles on my current Redline 5w30 fill I will take another video.
Hope this helps someone out there quiet their noisy Hemi.