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Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095489 05/04/19 08:14 AM
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ARCOgraphite Offline
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Knuckle Draggers?

Gear oil has been a ripoff for to long.

Easy to make , high volatility base stocks.

6 bucks a quart sounds about right.


2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095639 05/04/19 11:59 AM
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MolaKule Offline
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Originally Posted by BlakeB

Who makes Supertech gear oil? Does anyone know where I can find a PDS for it? I want to know what the KV100/KV40 viscosity looks like...




Whether it be the Blend or the synthetic, Warren of Omaha Neb makes it and it is essentially a Mag1 product:

Last edited by MolaKule; 05/09/19 10:14 AM.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095660 05/04/19 12:36 PM
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Nope, I only use Redline for gear lubes and ATF

Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095694 05/04/19 01:21 PM
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Sayjac Offline
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Quote
…Says on the back of the bottle API GL-5.....
What it actually says is "For use where API GL-5 is specification ." Some might say it's a distinction without difference. However, I compared it to Valvoline Synthetic Gear Oil right next it at WM and on the bottle it says, "Meets or exceeds API GL-5 specification." To me there's a difference.

As I noted, it could be MAG1 which is made by Warren Dist/WPP. However unlike ST, it has an available PDS which clearly shows all specifications met. That said, WM frequently uses different blenders depending on area, I've seen no authoritative evidence it is definitively the Mag1 product.

Link to MAG1 75w90 PDS

Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095719 05/04/19 02:11 PM
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I now believe that the starfire gear oil that is mentioned in my first post is made by Martin Lubricants.

Re: ST 75w90, what do you use it in? [Re: BlakeB] #5095764 05/04/19 04:01 PM
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Originally Posted by BlakeB
Originally Posted by wwillson
I'm running a 50/50 mix of SuperTech 75w-90 and 75w-140 in my 2018 Silverado 3500 HD and will post an oil analysis in about 20,000 miles.

I’m looking forward to your UOA.
I checked the rear diff fluid level in my 2017 3500 HD last night, it was 1.1 to 1.2 inches below the fill hole (spec is 0.6 to 0.8 below fill hole). It’s slightly underfilled. I have 12.6k miles, I think I might wait until about 15k miles and change the front and rear diffs as well as the transfer case fluid.

I took my dremel and marked a 90° “dipstick” at 17 & 21mm to make checking my rear diff fluid easier in the future.

Now that's splitting hairs. I use a calibrated index finger.

Last edited by Lubener; 05/04/19 04:02 PM.

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Re: ST 75w90, what do you use it in? [Re: Bullwinkle007] #5095785 05/04/19 05:03 PM
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Originally Posted by Bullwinkle007
Nope, I only use Redline for gear lubes and ATF


Same here. Red Line Superlight Shockproof in the track car. Amsoil 75w-110 in the tow rig.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5099695 05/08/19 03:40 PM
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I use ST regular gear oil in my boats outboard lower unit, have been for years.


2018 F150 5.0
2016 Ford Fusion 2.5
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5100241 05/09/19 05:33 AM
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I used ST 75w-90 in my Chevy 2006 3500HD for a decade; never had any issues with it. Had to add some FM to adjust the chemistry so the clutches in the G80 didn't chatter, but other than that, no problems whatsoever.

I now have the same in my 2018 F250SD; dropped the factory fill after break-in and replaced with more ST.


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: ST 75w90, what do you use it in? [Re: BlakeB] #5100423 05/09/19 10:02 AM
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I am going to use the FS 75W-90 in my Forrester front and rear diffs when I hit the 10k mile mark. I'll drain/fill again at 20k miles and then at 100k, 200k.


2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 167k
2015 Chrysler T&C, 95k+, M1 5W30, Wix OF
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Re: ST 75w90, what do you use it in? [Re: dnewton3] #5101068 05/09/19 09:52 PM
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Originally Posted by dnewton3
I used ST 75w-90 in my Chevy 2006 3500HD for a decade; never had any issues with it. Had to add some FM to adjust the chemistry so the clutches in the G80 didn't chatter, but other than that, no problems whatsoever.

I now have the same in my 2018 F250SD; dropped the factory fill after break-in and replaced with more ST.


How long were your OCI’s? Any heavy towing with your rig? I haul hay with mine, the gooseneck trailer loaded weighs around 24k lbs.
How much FM was needed? I have some on the shelf leftover from when I had a limited slip Tacoma. I think it’s champion brand, 4 oz bottles.

Last edited by BlakeB; 05/09/19 09:54 PM.
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5101221 05/10/19 05:51 AM
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FM not needed if using the synthetic ST.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: ST 75w90, what do you use it in? [Re: BlakeB] #5103110 05/12/19 06:46 AM
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Originally Posted by BlakeB
Originally Posted by dnewton3
I used ST 75w-90 in my Chevy 2006 3500HD for a decade; never had any issues with it. Had to add some FM to adjust the chemistry so the clutches in the G80 didn't chatter, but other than that, no problems whatsoever.

I now have the same in my 2018 F250SD; dropped the factory fill after break-in and replaced with more ST.


How long were your OCI’s? Any heavy towing with your rig? I haul hay with mine, the gooseneck trailer loaded weighs around 24k lbs.
How much FM was needed? I have some on the shelf leftover from when I had a limited slip Tacoma. I think it’s champion brand, 4 oz bottles.

OCIs were 50k miles.
Yes- most of those were pulling my RV or Kubota; that's what I had the truck for. It was not my daily driver.
Way back, when I did the OCI, the ST full syn was only for "top off" of LSD diffs. I had to add about 3oz of FM. However the ST full syn diff fluids are now fully formulated with FM, so you should not have to add any, or only a tiny amount. Too much FM is as bad, or worse, than having not enough. If you have to add some, start small and add a bit at a time until the performance gets acceptable.

Last edited by dnewton3; 05/12/19 06:47 AM.

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: ST 75w90, what do you use it in? [Re: ka9mnx] #5103211 05/12/19 08:28 AM
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Originally Posted by ka9mnx
Originally Posted by Miller88
I thought the 75w140 used to be rated for limited slips but turns out it isn't

The synthetic gear oil is. I emailed WD and they confirmed it.


Makes sense that it would be. I may have bought an older bottle set that didn't have it printed


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