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Mystic JT4 in 850s - Yes, another oil thread but lets keep it on track


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#1 670hoth

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Posted 16 September 2020 - 12:20 AM

OK, I've seen the other oil threads including ratings, etc... but just want to know about direct knowledge or experience with running Mystic JT-4 full synthetic in 850s since they have oil lubed bearings.  I know many are going to say why risk it? buy XPS but here's the thing,  I have run XPS as well as JT-4 in multiple sleds and truly believe JT-4 is better oil at least in isoflex bearing sleds. Regardless of this, I would like to hear about it in 850s.  If you have direct knowledge or experience with running JT-4 in an 850 please post how long, how many miles, and results. (Did any of them blow?)  Thanks



#2 snirthead

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Posted 16 September 2020 - 11:26 AM

Just out of curiosity why do you believe JT-4 is a better oil than XPS? Do you have any hard data on this theory? Or is it just more of a gut feeling? Not bashing, just curious?

Edited by snirthead, 16 September 2020 - 11:31 AM.


#3 670hoth

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Posted 16 September 2020 - 04:29 PM

Just out of curiosity why do you believe JT-4 is a better oil than XPS? Do you have any hard data on this theory? Or is it just more of a gut feeling? Not bashing, just curious?

Yes, like most anyone else here, I have no concrete data and make no claims as such. I base my thoughts on the following: We have never had a blown engine,stuck piston, etc.. in the family when running JT-4 and we have had a couple with XPS. I have disassembled several blown engines running XPS and two engines, one that bent the crank from blowing a belt, and one that had a base gasket leak running JT-4 and the oil film on the components in the JT-4 engines is pretty impressive and I can't say the same about the XPS engines.  Also, everyone I have turned on to running JT-4 has had excellent luck as well.   I am an engineer so I very much understand this is a small sample size and not an ideal data set but its good enough for me to have the opinion that I have.   Thanks


Edited by 670hoth, 16 September 2020 - 06:29 PM.


#4 TFD

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Posted 16 September 2020 - 08:08 PM

There was a guy a few years ago on Hardcoresledder that called himself The Chemist that said he evaluated most of the available oils and rated them.  When pressed, he wouldn't reveal details on his testing and went dark after that.  It looked like he was promoting Legend oil.  The data that he posted is attached.   JT4 is rated better than any of the OEM oils.  The date that I have on this file is 2014 so it is at least 6 years old.  

Attached Files


Edited by TFD, 16 September 2020 - 08:09 PM.


#5 670hoth

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Posted 16 September 2020 - 09:05 PM

There was a guy a few years ago on Hardcoresledder that called himself The Chemist that said he evaluated most of the available oils and rated them.  When pressed, he wouldn't reveal details on his testing and went dark after that.  It looked like he was promoting Legend oil.  The data that he posted is attached.   JT4 is rated better than any of the OEM oils.  The date that I have on this file is 2014 so it is at least 6 years old.  

Wow, that's great info!



#6 SShooterZ

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Posted 17 September 2020 - 11:34 AM

FYI The Chemist was found to be questionable as were his researching methods and I believe he was eventually banned from HCS due to his pitching of oils.



#7 AKsnow

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Posted 17 September 2020 - 05:58 PM

I’ve been running jt4 for about 8 years in everything 2 stroke I’ve owned. Chain saws 600sdi 800 ho 700ho 503 800r 800etec 850etec Some Might not know this but the jugs used to be the same (XPS and mystic) not sure if it was the same jug or oil manufacturer???? Never had any problems. Of the 3 of 8-10 engines that popped. Two were ring locater pins and one was a rod bearing. The rod bearing is was an 800ho with 4500 miles owned by my brother that never repacked iso. Newest sled 2019 850 etec has 2000 hard miles. No problems to report. To each his own but I can buy jt4 for 19.85 a gallon one mile from my house in Alaska. I’d never pay $40+ from the dealer for oil. In my opinion any of today’s synthetics because of there low temperature pour point are just fine. But again to each their own. This is just me. If buying a higher “quality oil” makes you feel better than it’s money well spent.
2021 900 ACE WT
2019 850 165 3”
2009 800 120 2"
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2016 800 163 T3
2015 800 137 1.75”
Wife’s

Yamaha 120
Arctic Cat 120
Polaris 120
for the kids

#8 IcutMetl

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Posted 17 September 2020 - 06:57 PM

Oh geez; the “Chemist” guy?

#9 Gordo427

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Posted 19 September 2020 - 02:05 PM

I’ve been running jt4 for about 8 years in everything 2 stroke I’ve owned. Chain saws 600sdi 800 ho 700ho 503 800r 800etec 850etec Some Might not know this but the jugs used to be the same (XPS and mystic) not sure if it was the same jug or oil manufacturer???? Never had any problems. Of the 3 of 8-10 engines that popped. Two were ring locater pins and one was a rod bearing. The rod bearing is was an 800ho with 4500 miles owned by my brother that never repacked iso. Newest sled 2019 850 etec has 2000 hard miles. No problems to report. To each his own but I can buy jt4 for 19.85 a gallon one mile from my house in Alaska. I’d never pay $40+ from the dealer for oil. In my opinion any of today’s synthetics because of there low temperature pour point are just fine. But again to each their own. This is just me. If buying a higher “quality oil” makes you feel better than it’s money well spent.



Well said 👍




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