Safe to use 5W-30?

[Ghosts40]

I know this is a beating a dead horse as there are so many threads about this! But for peace of mind im going to put this out again! Is 5W-30 Better than )W-20? I live in SW Ohio. Short winters and hot humid summers. That little tick drives me nuts!

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[Strommen95]

 

[Jeep Wick]

I know this is a beating a dead horse as there are so many threads about this! But for peace of mind im going to put this out again! Is 5W-30 Better than )W-20? I live in SW Ohio. Short winters and hot humid summers. That little tick drives me nuts!

Anything that meets the Mopar spec is allowed. I even run 10w30.

 

[roaniecowpony]

I know this is a beating a dead horse as there are so many threads about this! But for peace of mind im going to put this out again! Is 5W-30 Better than )W-20? I live in SW Ohio. Short winters and hot humid summers. That little tick drives me nuts!

3.6L?

 

[Ghosts40]

3.6L?

yes 3.6

 

[roaniecowpony]

5w30 is not only safe, it's a great choice for your weather. Pull up your oil temperature gauge in your dash cluster and watch it while you drive. Do some normal chores around town and maybe a highway excursion with some light spirited driving. You'll likely be very surprised by how hot the oil can get.

But viscosity rating isn't the only thing to consider in your selection. Jeep recommends using oil that meets or exceeds MS-6395 (their Chrysler standard). It's an old enough standard that it's exceeded by many oils. I'd recommend you use a full synthetic that has a rating of API SN as a minimum and SP will ensure it meets a Low Speed Pre-Ignition (LSPI) standard.

I pulled the intake manifold from my 2018 3.6, with ~33k miles to replace the oil cooler that had leaked. My intake ports and valves had very little buildup. Cylinder leakdown (a more critical test of compression leakage) was 79/80 on all cylinders, the best I had ever seen. My engine had been filled with Mobil 1 Extended Performance since the first change, and I went to 5w30 a few years after it was new. So, I can recommend Mobil 1 Extended Performance 5w30. The cheapest I've found it was at Walmart for about $27/5qt jug.

Given that my oil can exceed 245F and local temperatures where I wheel in the southwest, can exceed 100F regulary, I now use a 0w40 oil.

 

[DaltonGang]

I know this is a beating a dead horse as there are so many threads about this! But for peace of mind im going to put this out again! Is 5W-30 Better than )W-20? I live in SW Ohio. Short winters and hot humid summers. That little tick drives me nuts!

Enjoy the read.

https://www.jlwranglerforums.com/forum/threads/ditch-the-0w-20-before-its-too-late.124368/


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[Ghosts40]

Enjoy the read.

https://www.jlwranglerforums.com/forum/threads/ditch-the-0w-20-before-its-too-late.124368/


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LOL yeah I've read through this thread about 5 times. Its getting comfortable with switching from 0-20 that im having a hard time with.

 

[RhinoJLU]

I’ve always used 5w 30 in my 2012 jk. I did have to replace the rockers and lifters once due to the oil cooler leaking and my engine running hot. But I did have just under 200k in the engine before I sold it and it ran great still. 45000 on my current engine and haven’t switched to 5w 30 yet but probably will in next change. Does anyone have any idea what the first number means?(5w, 10w etc)

 

[Rhinebeck01]

I’ve always used 5w 30 in my 2012 jk. I did have to replace the rockers and lifters once due to the oil cooler leaking and my engine running hot. But I did have just under 200k in the engine before I sold it and it ran great still. 45000 on my current engine and haven’t switched to 5w 30 yet but probably will in next change. Does anyone have any idea what the first number means?(5w, 10w etc)

@RhinoJLU

"If the oil is 5W-30, “5W” describes the oil's viscosity at low temperatures. The lower the number, the faster the oil will flow at vehicle start-up. The “30” represents the oil's viscosity at normal engine temperatures or when your vehicle has been warmed."

 

[RhinoJLU]

@RhinoJLU

"If the oil is 5W-30, “5W” describes the oil's viscosity at low temperatures. The lower the number, the faster the oil will flow at vehicle start-up. The “30” represents the oil's viscosity at normal engine temperatures or when your vehicle has been warmed."

great explanation thanks!

 

[Gunfighter]

It's fine, but so is 0W-20. Use full synthetic. I use Pennzoil Ultra Synthetic. Regular oil changes at 5k with either will keep the engine happy. Also, if you don't have one the Fumoto oil drain valve is a plus.

 

[Pape]

The interesting portion of the viscosity talk is the extra thickness of the 20 VS 30 VS 40 VS 50 at the operating temperature.
The argument that comes back a lot is about the VVT actuator using oil pressure and that the extra thickness will be problematic.

In the instance of w20 VS w30 the cSt index difference at 100C is 1.5 cSt (8.8, 10.3 pennzoil).
According to this chart the difference in viscosity is 10C, therefore if you run w30 the viscosity at 90C will be the same as if you ran w20 at 80C.

If we go on the premise that the VVT will not operate under a certain temperature to protect the VVT system from too thick of oil, the question is at what temperature does the VVT start to operate and this will give us the oil thickness we can use safely for the VVT and probably the rest of the engine.

 

[roaniecowpony]

The interesting portion of the viscosity talk is the extra thickness of the 20 VS 30 VS 40 VS 50 at the operating temperature.
The argument that comes back a lot is about the VVT actuator using oil pressure and that the extra thickness will be problematic.

In the instance of w20 VS w30 the cSt index difference at 100C is 1.5 cSt (8.8, 10.3 pennzoil).
According to this chart the difference in viscosity is 10C, therefore if you run w30 the viscosity at 90C will be the same as if you ran w20 at 80C.

If we go on the premise that the VVT will not operate under a certain temperature to protect the VVT system from too thick of oil, the question is at what temperature does the VVT start to operate and this will give us the oil thickness we can use safely for the VVT and probably the rest of the engine.

How do you know that?

My understanding of the VVT and VVL systems is that they are binary: on-off. I believe they simply use oil pressure as the force, but the control is purely electronic. That is: hydraulically actuated, electronically controlled, like many hydraulic systems. Typically, these systems are tolerant of fluid temperatures/viscosity.

 

[Pape]

How do you know that?

My understanding of the VVT and VVL systems is that they are binary: on-off. I believe they simply use oil pressure as the force, but the control is purely electronic. That is: hydraulically actuated, electronically controlled, like many hydraulic systems. Typically, these systems are tolerant of fluid temperatures/viscosity.

OK, maybe did not use the proper wording, at the end of the day the question is :

1. Does the VVT VVL have a temperature operation range, in particular to protect them from the thick oil ? Remember the argument is about extra thickness of the oil is bad for VVT VVL
2. If they do, at what temperature do they start operating as this will point toward a certain oil viscosity threshold ?

Simple as that.

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