Schaeffers Soyshield lubricity?

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Mar 23, 2026
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I was wondering if anyone has ever sent off Schaeffers soyshield for HFRR testing? I reached out to the company and they didn’t have the results to show me. I have had some issues with using Powerservice in my equipment. I need the something for lubricity, cleaning, gelling, and water. I’m between Hotshot’s and Schaeffers. Since they make such good oil thought I’d try Schaeffers. Their diesel products seem to do everything I’m wanting. All my equipment is pre-def, they said all of their fuel products are compatible with rubber and nitrile seals so can be used in the older equipment. They recommend carbon treat which according to their data gives a 100 micron lubricity boost. I was thinking I’d try the Soyshield since (I think) it should have better lubricity with the methyl soyate + synshield, and then every 3000 miles or so use the carbon treat or diesel treat 2000. Was just curious if anyone has ever sent it off to be tested. Thanks

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I use PowerService. Surely they'd give you the details you need? Are you showing the image of what you're requesting?
 
I use PowerService. Surely they'd give you the details you need? Are you showing the image of what you're requesting?
I was surprised as well. I contacted the national fuel additive manager and he said that soyshield was not part of the third party study that carbon treat was, so that was all he could share. The image I uploaded is for carbon treat 137Ctpa. I’m hoping to find some info on 139a soyshield. I liked Powerservice maybe if I double dosed my fuel tanks with the white bottle in the winter it would help with gelling better? And drained the water out of them more often.
 
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I don't know anything about this produce but I do know that Archoil & Opti-Lube XPD are top notch.

This video from Lake Speed & Repair Geek gives a ton of information. Diesel additive YouTube Video
I like the looks of these and appreciate the info. I just have some big diesel tanks on the farm and I have some combines etc that sit with a lot of fuel in them for a season so I like how Schaeffers handles the water in the fuel. That’s why I used Powerservice. I think archoil 6500 doesn’t address water and their 6300 is a demulsifier. I believe Opti- lube is also a demulsifier. And after some research it appears hot shot is a demulsifier as well. Maybe that’s what I’ll have to use and change fuel filters and drain my static diesel tanks more regularly. I had some gelling with the white bottle of Powerservice this winter and have had some injector plugging.
 
I was surprised as well. I contacted the national fuel additive manager and he said that soyshield was not part of the third party study that carbon treat was, so that was all he could share. The image I uploaded is for carbon treat 137Ctpa. I’m hoping to find some info on 139a soyshield. I liked Powerservice maybe if I double dosed my fuel tanks with the white bottle in the winter it would help with gelling better? And drained the water out of them more often.
Thanks for the update. Maybe using the white bottle but also a small portion of 911 when it's expected to get really cold? I don't think we have the details here for the Schaeffer's. Although I like to see folks use them since they're from my home state of MO.
 
Thanks for the update. Maybe using the white bottle but also a small portion of 911 when it's expected to get really cold? I don't think we have the details here for the Schaeffer's. Although I like to see folks use them since they're from my home state of MO.
That’s a good idea. Thanks. I might just do that. Does diesel 911 have alcohol in it? Probably nothing that would hurt anything right? I’ve used it before but I had to have a tractor and combine engines overhauled last year and holy cow I don’t want to have to do that on anything else. Supposedly the tractor was related to an injector tip issue and melting down a cylinder, I was using Powerservice every fill-up. I was interested in Schaeffers initially because I wouldn’t have to change products from winter to summer since it’s more of an all around all season additive. And they say no alcohols. According to one of the sales reps it’s supposed to help with the water more than others and more lubricity and cleaning properties, but I definitely wanted to know more before I buy it since it’s $$. But if it saves me from more overhauls I’m considering it.
 
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That’s a good idea. Thanks. I might just do that. Does diesel 911 have alcohol in it? Probably nothing that would hurt anything right? I’ve used it before but I had to have a tractor and combine engines overhauled last year and holy cow I don’t want to have to do that on anything else. Supposedly the tractor was related to an injector tip issue and melting down a cylinder, I was using Powerservice every fill-up. I was interested in Schaeffers initially because I wouldn’t have to change products from winter to summer since it’s more of an all around all season additive. And they say no alcohols. According to one of the sales reps it’s supposed to help with the water more than others and more lubricity and cleaning properties, but I definitely wanted to know more before I buy it since it’s $$. But if it saves me from more overhauls I’m considering it.
Because you have some reliability concerns I'd certainly reach out to PowerService. I don't know what the ingredients are on the 911.
 
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