Ecoboost Performance Forum

Ecoboost Performance => Troubleshooting, Maintenance, TSB Articles => Maintenance, Oil, and Fluids => Topic started by: BlueSHO on January 15, 2014, 11:13:28 AM

Title: Gear oil question
Post by: BlueSHO on January 15, 2014, 11:13:28 AM
The other day when I tried to pull a car out of the snow when the strap snapped (another thread on that) I noticed in the snow under the car what appeared to be some gear oil. I have not crawled under the car to check but could I have caused gear oil to vent out of the rear end? I did a lot of rocking back and forth to get the car unstuck and thought maybe this caused the oil to vent. Did not look like a lot but enough for me to notice. Does the rear end have a vent on it where this could happen? Also does the rear end use synthetic 75w140 oil? Thx
Title: Re: Gear oil question
Post by: DJE624 on January 15, 2014, 11:20:12 AM
I don't know about the rear end but the PTU does have a vent.  The first time I drove my SHO really hard, I had a few drops over night.  I freaked out but was assured that it was normal.
Title: Re: Gear oil question
Post by: BlueSHO on January 15, 2014, 11:37:04 AM
What kind of oil does the PTU use?

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Title: Re: Gear oil question
Post by: BlueSHO on January 15, 2014, 11:44:52 AM
Found it. Looks like 75w-140

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Title: Re: Gear oil question
Post by: DJE624 on January 15, 2014, 11:47:37 AM
Sounds right.  I wasn't sure.
Title: Re: Gear oil question
Post by: BlueSHO on January 15, 2014, 11:54:39 AM
Probably was the PTU now that I think about it. Looks like a bit$h to add some or check.

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Title: Re: Gear oil question
Post by: mjhpadi on January 15, 2014, 06:40:11 PM
Quote from: JeffsSport on January 15, 2014, 11:13:28 AM
Also does the rear end use synthetic 75w140 oil? Thx
No the differential uses a different weight..maybe 75w90? I am not sure of that, but I do know it is NOT the same as the PTU.
Title: Re: Gear oil question
Post by: bpd1151 on January 15, 2014, 06:47:21 PM
75-140 for the PTU
75-90 for the REAR DIFF

1.1 pints PTU
2.3 pints REAR DIFF

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Title: Re: Gear oil question
Post by: BlueSHO on January 15, 2014, 06:51:59 PM
Thanks... I think it was the PTU that puked and I'll check tomorrow and top it off if needed. I guess just make sure the level is up to the fill hole.

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Title: Re: Gear oil question
Post by: DJE624 on January 15, 2014, 06:54:44 PM
2012 SHO Manual.

(http://i1059.photobucket.com/albums/t440/DJE624/Capture_zpsdabdea77.jpg)
Title: Re: Gear oil question
Post by: BlueSHO on January 15, 2014, 08:39:14 PM
Thanks for doing the leg work..:-)

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Title: Re: Gear oil question
Post by: BlueSHO on January 19, 2014, 01:35:22 AM
Just an update. The rear end does have a vent towards the top of the differential housing and this is where the gear oil puked a few ounces the other day. I pulled the plug and topped it off with the same amount I lost. I was at a slight incline when I was pulling the car out of the snow and that's probably why it burped some.

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Title: Re: Gear oil question
Post by: DJE624 on January 19, 2014, 01:47:19 AM
Interesting.  Glad you found it!
Title: Re: Gear oil question
Post by: BoostfoSHO on January 05, 2018, 09:29:10 AM
Any inputs on this oil? I've never used it but walking the isles at Napa and saw it was extremely expensive so I figured maybe it's good... Anyone ever heard of it or used it ?
It's $70 bucks for that small bottle.(https://uploads.tapatalk-cdn.com/20180105/59c1492e59cc1cb07dc8e95e9afd6690.jpg)

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Title: Re: Gear oil question
Post by: ZSHO on January 05, 2018, 11:01:49 AM
Quote from: BoostfoSHO on January 05, 2018, 09:29:10 AM
Any inputs on this oil? I've never used it but walking the isles at Napa and saw it was extremely expensive so I figured maybe it's good... Anyone ever heard of it or used it ?
It's $70 bucks for that small bottle.(https://uploads.tapatalk-cdn.com/20180105/59c1492e59cc1cb07dc8e95e9afd6690.jpg)

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What is it made out of Gold! LOl
I have always used Redline 75w-140 GL-5 Gear oil which meets,exceeds GL-5 OEM Specs!   
I ordered a couple of quarts from www.amazon.com (http://www.amazon.com) for roughly $15.00 ea .IIRC! 
IMO would stick with Redline or Amsoil especially for the PTU,RDU. Z
https://www.redlineoil.com/75w140-gl-5-gear-oil (https://www.redlineoil.com/75w140-gl-5-gear-oil)
Title: Re: Gear oil question
Post by: BoostfoSHO on January 05, 2018, 11:10:15 AM
I'm thinking of doing my ptu and rear diff soon, I get free Mobil 1 synthetic oil at my job. I use it for my engine. Do you recommend purchasing redline or amsoil or should I stick with my free Mobil 1 from work?

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Title: Re: Gear oil question
Post by: ZSHO on January 05, 2018, 11:24:34 AM
Quote from: BoostfoSHO on January 05, 2018, 11:10:15 AM
I'm thinking of doing my ptu and rear diff soon, I get free Mobil 1 synthetic oil at my job. I use it for my engine. Do you recommend purchasing redline or amsoil or should I stick with my free Mobil 1 from work?

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If you want the Real Deal True quality full synthetic Group 4 Based oil then Redline or Amsoil would be the way to go IMHO.  Z

Gear oil Specs for comparison! below!

http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf (http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf)
Title: Re: Gear oil question
Post by: BoostfoSHO on January 05, 2018, 11:33:22 AM
Quote from: ZSHO on January 05, 2018, 11:24:34 AM
Quote from: BoostfoSHO on January 05, 2018, 11:10:15 AM
I'm thinking of doing my ptu and rear diff soon, I get free Mobil 1 synthetic oil at my job. I use it for my engine. Do you recommend purchasing redline or amsoil or should I stick with my free Mobil 1 from work?

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If you want a True quality full synthetic based oil then Redline or Amsoil would be ideal IMHO.  Z

Gear oil Specs for comparison! below!

http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf (http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf)
Ok got it thanks, I'll definitely be buying the good stuff then. Thank you.

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Title: Re: Gear oil question
Post by: abs on September 22, 2019, 10:28:12 AM
I know this is an old thread, but thought I'd share my perspective on the gear oil question.  My take when it comes to any kind of oil, including gear oil, is to only use oils that are CERTIFIED to meet a particular specification.  This does not mean that an oil made by Amsoil, Redline or any other boutique producer is bad, but it does mean that as a consumer it is very difficult to determine if the boutique oil in fact meets all the criteria for an oil specification such as API GL-5/MT-1/MIL-PRF 2105E.  I have also learned that some oil specifications are more or less a joke.  For example, when it comes to engine oils, the API SN or SN+ specifications focus mostly on fuel economy standards and are not competitive with most European spec oils.  Lubrizol provides a really great spider chart that allows us to see the difference in performance across a wide range of motor oil attributes.  If you compare the API specs versus others, you can see what I'm talking about here: 

https://www.lubrizol.com/Lubricant-and-Fuel-Additives/Engine-Oil-Additives/ACEA/Relative-Performance-Tool (https://www.lubrizol.com/Lubricant-and-Fuel-Additives/Engine-Oil-Additives/ACEA/Relative-Performance-Tool)

Back to gear oil for our vehicles.  Given the choice, I prefer to use a fluid such as Mobil 1 Delvac gear oil.  This product is formulated for heavy duty use in big rig trucks and is intended to have a very long service life (500,000 miles or more).  It can be found by special order from a few sites on the internet (maybe even Amazon now) in the 75w-90 weight.  It is a full synthetic and meets some very stringent specifications and approvals from a wide range of truck manufacturers.  See here:

https://www.mobil.com/en/mobil-delvac/products/gear-oils/mobil-delvac-1-gear-oil (https://www.mobil.com/en/mobil-delvac/products/gear-oils/mobil-delvac-1-gear-oil)

I recommend this lubricant for the rear differential since it's the right weight to use (slightly thinner cold viscosity than the OEM spec which is a good thing) and the rear diff is somewhat challenging to get to for fluid drain/fill.

The PTU is a more challenging scenario.  Ford requires a 75-140 weight fluid.  The OEM fluid has a tendency to turn to sludge when not maintained, and I can't recommend it for that reason.  As an aside, it appears Ford is very proud of this product, they use it widely across their product line.  Also, ConocoPhilips appears to be Ford's partner for developing fluids.  If you try to find non Motorcraft fluid that explicitly state they meet a Ford spec, often times only ConocoPhilips will have one available when no other producer does.   I am almost certain that this product is the same (or very similar to) the Motorcraft 75w-140:  https://www.phillips66lubricants.com/product/syngear-ss/ (https://www.phillips66lubricants.com/product/syngear-ss/).   

For the fun of it, I did once try Amsoil 75w-140 in my PTU and I was not happy with the performance - I noticed bad odors and it also seemed like there was more drive train drag with it in there.  The Delvac 80-140 is an option, but it only comes in large drums, which is not really feasible to obtain for me.  I have not used it.  The Mobil 1 (not Delvac) 75w-140 is a quality product which I have used with success, but it also has a friction modifier in it from the factory for limited slip differentials (not required in a PTU) which is not optimal.  Schaeffer's and Motul both make a few interesting 75-140 gear oils, I have not tried them, but these could be good choices too.  I'm not really a fan of the Valvoline 75w-140 based on personal experience, it tends to break down fast.  I've been running the Mobil 1 75-140 for some time, it seems to hold up well and does a good job.  I have not tried Redline or Royal Purple.  I know a lot of folks love these products and recommend them, I worry about these products not being certified.  I know you may be thinking, "well this guy used the Amsoil gear oil so what gives?"  The Amsoil gear oil is not certified and I regret having used it as my experience was not good.

So, my conclusion is that given what is readily available, I think the best choice for the PTU is actually the Mobil 1 75w-140 and the for the rear differential the Mobil Delvac 1 75w-90.  And, as has been stated many times before, swap the PTU fluid regularly . . .

I hope this helps.

Title: Re: Gear oil question
Post by: SHOdded on September 22, 2019, 07:32:16 PM
Mobil1 was in the PTU when it went bellyup.

IME, Amsoil Severe Gear has performed the best in both the PTU and RDU, followed closely by Redline LWSP.  Valvoline is doing pretty good right now as well, about 6 months in the PTU so far, but you can tell the difference from SVG and LWSP for sure.

YMMV, but I AM disappointed that SVG did not perform for you.
Title: Re: Gear oil question
Post by: avidmotion on May 08, 2020, 01:25:35 AM
Stay with Amsoil! Like 20 bucks....
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