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Castrol Edge 5w40 in a 3.7 Jeep #5183239 08/09/19 10:25 PM
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HoosierJeeper Offline OP
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Getting ready to do an oil change on the Liberty tomorrow. Saw some Castrol Edge 5w40 on the shelf at Walmart and it got me thinking, would that be a good choice? It has just over 200k on it. I’ve owned it basically it’s whole life and I’ve always run one of major brands of Dino in it, 5w30 and used high mileage stuff for the past few years. It leaks (and probably burns a little, but never see a puff of smoke on start up or after idling it) about a quart per 1-1.5k. 95% of its driving is highway (sits at one speed for a good 60 miles daily) Thoughts on the switch? Thanks!

I do plan on tending to some of the leaks over the winter when it’ll be a fun vehicle and not required to be a DD.

Last edited by HoosierJeeper; 08/09/19 10:38 PM.

15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183247 08/09/19 10:54 PM
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Onetor Offline
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Edge will serve you well. But, Castrol makes a HM 5W40 in quarts. Walmart doesn't sell it. Amazon does, but it's pricey. Original owner? "Basically it's life" is unclear?


N = R* x fp x ne x fl x fi x fc x L
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183256 08/09/19 11:09 PM
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zrxkawboy Offline
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I just put some Pennzoil 0W40 in ours. It seems fine...didn't notice any difference from 5W30.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183260 08/09/19 11:13 PM
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JLTD Offline
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Should be fine...interested in the results since I'm considering a 40 in ours.


I use the overseas manual to choose my oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, SS 5w20/Amsoil

Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183348 08/10/19 05:25 AM
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dave1251 Offline
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It should work well may or may not help with the consumption.


make the inside of your engine oil cap white.
don't use.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183371 08/10/19 06:31 AM
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demarpaint Offline
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It should be fine.


God Bless Our Troops

Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: Onetor] #5183376 08/10/19 06:40 AM
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dlundblad Offline
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Originally Posted by Onetor
Edge will serve you well. But, Castrol makes a HM 5W40 in quarts. Walmart doesn't sell it. Amazon does, but it's pricey. Original owner? "Basically it's life" is unclear?


Do you 10w40 HM?

I’ve not seen a 5w40 HM yet. Sounds like a nice oil though.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980 (Ecore)

Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: Onetor] #5183394 08/10/19 07:17 AM
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HoosierJeeper Offline OP
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Originally Posted by Onetor
Edge will serve you well. But, Castrol makes a HM 5W40 in quarts. Walmart doesn't sell it. Amazon does, but it's pricey. Original owner? "Basically it's life" is unclear?

Got it when it was 2 years old, had about 36k on it. So basically new in my book after 200k and 12 more years!

Does anyone think it’d be bad to switch to a full synthetic at this point?


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183404 08/10/19 07:43 AM
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GMBoy Offline
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Why a 40wt? Modern oils, especially synthetics, don't break down and fall out of grade like old oils did. I do not see the need or benefit of a thicker oil in this case. I personally would stick with a 5w/30 or 10w/30 high mileage synthetic.

Last edited by GMBoy; 08/10/19 07:44 AM.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: GMBoy] #5183447 08/10/19 08:33 AM
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dave1251 Offline
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Originally Posted by GMBoy
Why a 40wt? Modern oils, especially synthetics, don't break down and fall out of grade like old oils did. I do not see the need or benefit of a thicker oil in this case. I personally would stick with a 5w/30 or 10w/30 high mileage synthetic.



Just plain wrong. ISLAC 30 grades shear out of grade. It doesn't matter if it is "synthetic" this has been the case for decades.


make the inside of your engine oil cap white.
don't use.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183448 08/10/19 08:38 AM
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Gasbuggy Offline
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Try it. That's a healthy oil burn rate.


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5183458 08/10/19 08:54 AM
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I finally joined the thickie club and am using 5w40 made by Citgo in a 2008 Chev 6.0 with 185,000 miles. The 185,000 miles was with synthetic 5w30 of various brands. The hot idle oil pressure has increased by a few psi and is still in the high 30’s. The cruising oil pressure is unchanged at 40 psi. I have a jug of Mobil 1 Turbo Diesel Truck on tap and then a couple of jugs of Penzoil Platinum Euro 5w40 ready. This magical 6.0 still doesn’t consume oil. (Knock wood). laugh

Last edited by Snagglefoot; 08/10/19 09:04 AM.

If you want the job done right......do it yourself.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: dave1251] #5183602 08/10/19 12:46 PM
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Originally Posted by dave1251
Originally Posted by GMBoy
Why a 40wt? Modern oils, especially synthetics, don't break down and fall out of grade like old oils did. I do not see the need or benefit of a thicker oil in this case. I personally would stick with a 5w/30 or 10w/30 high mileage synthetic.



Just plain wrong. ISLAC 30 grades shear out of grade. It doesn't matter if it is "synthetic" this has been the case for decades.

We should be able to prove this one way or another with our extensive collection of UOA’s on this forum. smile

Last edited by Snagglefoot; 08/10/19 12:47 PM.

If you want the job done right......do it yourself.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: Snagglefoot] #5186633 08/14/19 07:22 AM
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Originally Posted by Snagglefoot
Originally Posted by dave1251
Originally Posted by GMBoy
Why a 40wt? Modern oils, especially synthetics, don't break down and fall out of grade like old oils did. I do not see the need or benefit of a thicker oil in this case. I personally would stick with a 5w/30 or 10w/30 high mileage synthetic.



Just plain wrong. ISLAC 30 grades shear out of grade. It doesn't matter if it is "synthetic" this has been the case for decades.

We should be able to prove this one way or another with our extensive collection of UOA’s on this forum. smile



I agree and from what I have seen, I stand by my comment that today's oils do not fall out of grade. We have 0W/20 oils holding grade with 7000 miles+ on them. In addition, Snagglefoot has not come to the present day with his belief that all oils still shear and that synthetics are superior in many ways over conventional oils. Now, I am aware that oil will eventually wear out and shear down but nothing like days past and no reason to go to a thicker oil weight (like a 40) in preparation of oil shearing down. Very few vehicles spec 40wt oils or will benefit from them unless the vehicle has very high miles and a badly worn engine perhaps. Of course I may be wrong and am always open to learn.

Last edited by GMBoy; 08/14/19 07:25 AM.
Re: Castrol Edge 5w40 in a 3.7 Jeep [Re: HoosierJeeper] #5187234 08/14/19 06:32 PM
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Prior to my current oil in my trucks engine was Castrol Euro 0W40. My engine had never run as quiet as it did with that oil in it.
My next OCI will be Havoline PRO DS 5W30. If after using that oil and my engine isn't any quieter, I will go back to a 0W40.
Any good 0W40 oil suggestions?


"One Filter, One OCI!"
2007 F150, 4.2 V6
Havoline HM 5W20, MC FL-400S
"One Box, One OCI!"
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