Hi All,

this question pertains to the use of 0w-40 or 5w-40. I’m in love with Rotella t6 and have found some really promising posts with uoa’s in the 3.6.

ive also come across a lot of negative opinions, but these are always in the lines of “my tech said” or “”I heard this from...”. Does anyone have any first hand experience with a heavier weight oil in their 3.6?

 

IMO.. Rotella t6 is a diesel oil.. I did not check its certification for gasoline engines and does it meet Jeep API certification? Now to the question.. A very good ASE certified factory trained JEEP technician expressed concern using heavier weight oils could slow or effect the CAM timing/phase on the 3.6. This was direct to my question of going to 5w30 synthetic years ago.

 

My 2010 has used synthetic 5w-30 with a quart of Lucas for years, but that's not what you asked. All of my friends have the 3.6 and now and again they'll ask me to change their oil, so I give them the same treatment I use- synthetic 5w-30 plus Lucas. We bought my girlfriend's 2016 with 10k miles, she's now got 50k miles on my mix and not a single issue. Going off of the UOA I posted from Blackstone and Mr. T's analysis, the oil mixture I'm running is roughly 5w-40. I've got 220k miles on this configuration in my 2010 and with any luck we'll see the same results on the 16.

Best of luck Jim.

 

The engine was actually designed for use with 5w30, but they switched it to 5w20 to squeeze out a little extra fuel economy for requirements.

 

Rotella 5-40 is a great oil, ran in my FJR1300 as do many other owners, my KingQuad and then my Canam 800.
Ran in 3 different jeeps, 2 JK's, 1 LJ . 2 different built EB's m Lawn mower and pressure washer.
Plus other motors never a issue.

Only thing I can't use it in is my Audi TDI motor.

 

Thank you. This is what I’m looking for. 2010 is the 3.8 correct? But your girlfriends Jeep looks like it’s doing fine.

 

many can’t you use it in the Audi? And the JKs were the 3.6 that you used it in?

 

Correct, 2010 is the 3.8 but her 2016 is the 3.6 without issue.