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Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi #4950018 12/12/18 01:45 PM
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SavagePatch Offline OP
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Here's my latest UOA. Ran this over the warmer months with some towing of our Jayco Jayflight 264BH this summer and fall. Wear metals appear to be better. It was interesting* to see the differences between the different viscosity grades. Possibly from the higher viscosity, moly, or zinc?

The two previous samples are labelled wrong. They should read as:

March 18 = Rotella T6 0w40
Juky 14 = Mobil 1 Turbo Diesel Truck 5w40

*I do these UOA's for fun and realise that this isn't scientific data

20181212_103254.jpg
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4950021 12/12/18 01:47 PM
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CT8 Offline
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Thicker oil protects better.

Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4950076 12/12/18 02:50 PM
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bullwinkle Offline
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Looks like the MUCH less expensive Mystik protects just as well as the more expensive full synthetics. If Blain’s Farm & Fleet stores were closer to me, I would run their Mystik JT-8 10W30 in everything, they’ve had it as low as $25/5gallon pail AR, or $1.25/qt.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4950354 12/12/18 08:36 PM
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Miller88 Offline
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I just bought this for $6 for the 2 gallon jug on clearance at Tractor supply.

Glad to see it's worth what I paid!


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4950668 12/13/18 08:19 AM
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BoiseRob Offline
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The Ecodiesel (FCA) manual specifies 5w40 per the updated 2016 Diesel Supplement...

"We recommend you use 5W-40 synthetic engine oil such as MOPAR or Shell Rotella
that meets FCA Material Standard MS-10902 and the API CJ-4 or ACEA E9/E7 or
ACEA A3/B4 engine oil category is required."


2007 Chevrolet Silverado 2500HD LBZ Duramax
2016 Jeep Grand Cherokee Ecodiesel
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4950718 12/13/18 09:16 AM
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dnewton3 Offline
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Perfect example of why paying for more does not always get you more.
The UOAs show the engine is in fine condition. Low wear metals and no contamination.
Honestly, it's probable that this engine in no way "needs" a 5w-40 syn, especially for 5k mile OCIs.
While under warranty, best just to do what you're told though.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4951563 12/14/18 06:36 AM
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alarmguy Offline
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^^Agree^^
Why on earth do people feel paying more for something with the EXACT same rating (in this case API) gets you better protection?
Its a fool who thinks the marketing of major oil companies that gets you to pay crazy prices for oil of the same rating = more profit for them.

Mystik is a fine oil, really a "best kept secret" in the agriculture industry.
What is even more crazy, its produced by Citgo, a major refiner, who also produces private labeled oils.

For those interested, I have run Mystik JT8 15/50 in my 2014 Harley Road king since maybe after the first 2 oil changes which is almost 4 years now and I just ran yet another UOA on the oil two weeks ago and posted in BITOG.

Here is the link to the UOA or go down to the Powersports UOA section.

All SIX UOAs on the page are the Mystik JT8 15/50 and always turns in great wear numbers and why shouldnt it? Its a great oil at a realistic price with the same exact rating of oils that cost 500% more.
Dont get me wrong, for me, its not about buying less expensive oil, its about using the proper weight oil with the proper API recommended by the manufacturer.

Last edited by alarmguy; 12/14/18 06:43 AM.

14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4951721 12/14/18 11:07 AM
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390pi Offline
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Thanks for posting.

Is there any concern for poisoning the SCR & DPF with the 15w40?

I have the same motor in a Jeep Grand Cherokee;
I'm curious as to if I missed a discussion of this...


2016 Ram 1500 4x4 3.6
2015 Jeep Grand Cherokee AWD 3.0 Diesel
2013 Ford F250 4X4 6.2
2000 Chev Suburban 4X4 2500 6.0
2005 Focus ZX5 track car
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: 390pi] #4951933 12/14/18 03:36 PM
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BoiseRob Offline
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Originally Posted by 390pi
Thanks for posting. Is there any concern for poisoning the SCR & DPF with the 15w40? I have the same motor in a Jeep Grand Cherokee;
I'm curious as to if I missed a discussion of this...


The Diesel Supplement I quoted was from my 2016 Jeep GC. Any risk would be the same for the 5w40 or 15w40 since the SA is limited to 1.0% max. I just think the 15w40 is too heavy for a VM motor that specs 5w30 in Europe and was changed to 5w40 due to our North American driving habits, IE: long distance travel.


2007 Chevrolet Silverado 2500HD LBZ Duramax
2016 Jeep Grand Cherokee Ecodiesel
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: 390pi] #4952139 12/14/18 07:34 PM
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SavagePatch Offline OP
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Originally Posted by 390pi

Is there any concern for poisoning the SCR & DPF with the 15w40?


No concern at all. But the 15w40 has nothing to do with whether or not it's safe for exhaust aftertreatment systems. You need to look at the oils spec. In this case it's CK-4 (midSAPS) which is safe for aftertreatment systems. It would be safe in your Jeep GC EcoDiesel. If you can find an oil that is CK-4 and CES-20081 then you'll be even better.

20180629_102937.pngScreenshot_20181214-162651.jpg
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: BoiseRob] #4952145 12/14/18 07:47 PM
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SavagePatch Offline OP
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Originally Posted by BoiseRob
I just think the 15w40 is too heavy for a VM motor that specs 5w30 in Europe and was changed to 5w40...


C'mon Rob! A 5w40 and 15w40 are the same weight (heavy) when warm. Unless your climate dictates the use of a 5w for cold starts the 15w is fine.

Where in my posted UOA are you seeing that the 15w40 harmed the engine?

Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4952404 12/15/18 02:06 AM
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DoubleWasp Offline
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Pretty sure they moved to 5w40 because of engines defecating the bed.

The Mystik is working for you. Wear metals look great.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: BoiseRob] #4953991 12/17/18 09:53 AM
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beanoil Offline
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Originally Posted by BoiseRob
The Ecodiesel (FCA) manual specifies 5w40 per the updated 2016 Diesel Supplement...

"We RECOMMEND you use 5W-40 synthetic engine oil such as MOPAR or Shell Rotella
that meets FCA Material Standard MS-10902 and the API CJ-4 or ACEA E9/E7 or
ACEA A3/B4 engine oil category is required."

Fixed it for you. They only recommend, not require.
FCA interest is getting you to end of warranty, nothing else. That's why the switch, engines were self destructing. The UOA doesn't lie, (at least not too much).
Off topic, in my Powerstroke it's "RECOMMENDED" a 5w40 is used for severe service. I've settled on 15w40 as optimum for wear in my truck, for my use.
OP, I say you did good, and agree Mystik is a sleeper. Keep on keepin' on.

Last edited by beanoil; 12/17/18 09:55 AM.
Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: BoiseRob] #4991448 01/26/19 01:46 PM
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Fraser434 Offline
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Originally Posted by BoiseRob
Originally Posted by 390pi
Thanks for posting. Is there any concern for poisoning the SCR & DPF with the 15w40? I have the same motor in a Jeep Grand Cherokee;
I'm curious as to if I missed a discussion of this...


The Diesel Supplement I quoted was from my 2016 Jeep GC. Any risk would be the same for the 5w40 or 15w40 since the SA is limited to 1.0% max. I just think the 15w40 is too heavy for a VM motor that specs 5w30 in Europe and was changed to 5w40 due to our North American driving habits, IE: long distance travel.


I've run 15W40 in summer in my EcoD, the 15 is a cold flow number, 40 is a warm flow number generally 12-14 Cst, above 32F ambient temperature it doesn't matter if you have 5W40, 10W40 or 15W40 or even SAE40, when the engine is warmed up their viscosity is basically the same. It just makes matters easier for explanation if you state 5W40, it will cover basically all temperatures from -20F to 120F ambient, thats why FCA does this.

Re: Mystik JT-8 15w40, 2015 RAM EcoDiesel, 4,995 mi [Re: SavagePatch] #4992405 01/27/19 01:09 PM
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DoubleWasp Offline
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The Mystik handed RT6 it's walking papers from what I see. I'd keep using it.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
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