3.6 l Engine Oil Type

[Caleb75]

I started off using 0w20 as the manufacturer calls for. I did a couple of oil analysis. I then read some articles about 5w30 being the optimum weight for the majority of all water cooled automotive engines. So, I switched from Amsoil 0w20 to Amsoil 0W30. Then I had another oil analysis ran, my wear numbers went down. I eventually, put Amsoil 5w30 in and haven't looked back. My wear numbers are lower using the 0w30 and 5w30. No issues with the engine. I use Amsoil because I tried it, I liked it so I started selling it. I have it in the Jeep from the motor to the differentials and every where in between.

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[mwilk012]

I started off using 0w20 as the manufacturer calls for. I did a couple of oil analysis. I then read some articles about 5w30 being the optimum weight for the majority of all water cooled automotive engines. So, I switched from Amsoil 0w20 to Amsoil 0W30. Then I had another oil analysis ran, my wear numbers went down. I eventually, put Amsoil 5w30 in and haven't looked back. My wear numbers are lower using the 0w30 and 5w30. No issues with the engine. I use Amsoil because I tried it, I liked it so I started selling it. I have it in the Jeep from the motor to the differentials and every where in between.

How can you be certain that the wear numbers aren’t lower because the engine is simply getting past the break in period?

 

[DaltonGang]

I just changed to Penzoil 5w-30, full synth, for the first time. Around 25,000, and I am tire of the engine clatter, when fully warmed up. I immediately noticed the engine was quieter., after the change. Then again it is always quiet after a change. Time will tell.

 

[Caleb75]

How can you be certain that the wear numbers aren’t lower because the engine is simply getting past the break in period?

I am certain some of the first analysis wear reduction was due to the final break in period but half of the oil analysis were done after 20k miles. It was a impressive difference the first analysis going from 0w20 to 0w30.

 

[roaniecowpony]

I am certain some of the first analysis wear reduction was due to the final break in period but half of the oil analysis were done after 20k miles. It was a impressive difference the first analysis going from 0w20 to 0w30.

Well the good part is that they're not up. The naysayers will always find something to pick at. In the end, the quality of the oil will be the determining factor. Added Viscosity will just provide some temperature/load buffer.

 

[jmr]

I have a 2021 Grand Cherokee with a 3.6 and use only 5W-30 like my 2.0L JL uses.
On Avengerforumz in 2013 a FCA engineer mentioned to use 5W-30 in the 3.6 V6.
He said going to 0W-20 was a corporate gas mileage move and 5W-30 provides more protection.

 

[DanW]

I have a 2021 Grand Cherokee with a 3.6 and use only 5W-30 like my 2.0L JL uses.
On Avengerforumz in 2013 a FCA engineer mentioned to use 5W-30 in the 3.6 V6.
He said going to 0W-20 was a corporate gas mileage move and 5W-30 provides more protection.

One of the lead Pentastar designer on BITOG said use 0w20 and gave many reasons. And remember, the famous 625k mile Pentastar did it on 5w20, which at operating temp is no different from 0w20. I think you'd be fine on either, but I'm going with the 20 weight. I had a Ford F150 that is at about 200k with its current owner. All on 5w20.

That said, 5w30 is barely thicker at operating temp than a 20 weight. Should be fine.

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