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Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5110310 05/20/19 02:25 PM
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Strange. 80W90 conventional is so common I able to accidentally photograph it. Check out the Pennzoil.

13BED6D2-5671-4ED4-9037-CE964C769452.jpeg

If you want the job done right......do it yourself.
Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5111139 05/21/19 09:30 AM
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meep Online Content
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I'd run syn in the front as well - ideally for thinner cold weather characteristics. It's a waste to spin all that stuff when just needing RWD. I *really* wish there was a manual hub offering for these things so we could disconnect the front driveline unless we actually need it. It gained me 1 mpg in past on a pathfinder.


2018 F150
2015 crv (wifey!)
Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5111145 05/21/19 09:37 AM
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The reason they run conventional in the front is because it sticks to the gears much better than syn. If you look in gearboxes on Ag equipment that has syn gear oil in it on machinery that sits for months at a time. The part of the gears that are above the oil line the gears will rust. They can sit for 10 years with conventional oil and will never have rust on them.

Re: 2015 F150 front and rear diff fluid [Re: meep] #5111953 05/22/19 04:03 AM
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hatt Offline
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Originally Posted by meep
I'd run syn in the front as well - ideally for thinner cold weather characteristics. It's a waste to spin all that stuff when just needing RWD. I *really* wish there was a manual hub offering for these things so we could disconnect the front driveline unless we actually need it. It gained me 1 mpg in past on a pathfinder.

These trucks(or most of them) disengage the front driveline when in 2wd via vacuum operated hubs.


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5111966 05/22/19 04:40 AM
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Originally Posted by Buzzinhalfdozen
All,

My 2015 f150 specs 80w-90 in front and 75w-85 in rear. It's a non-limited slip 3.31 no e-locker. Viscosity of the 75w-85 at 100 degrees Celsius is 11.53 cSt. I'm guessing it's a fluid speced primarily for fuel economy. I would like to run a single fluid front and rear that is easy to acquire.

Anyone out there running a 75w-90 front and rear with good results?

I have used 75w-90 in my F150 diffs. without problems and will continue to do so.

Last edited by Lubener; 05/22/19 04:41 AM.

The "thinking" man's friend.
Re: 2015 F150 front and rear diff fluid [Re: hatt] #5111968 05/22/19 04:42 AM
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Originally Posted by hatt
Originally Posted by meep
I'd run syn in the front as well - ideally for thinner cold weather characteristics. It's a waste to spin all that stuff when just needing RWD. I *really* wish there was a manual hub offering for these things so we could disconnect the front driveline unless we actually need it. It gained me 1 mpg in past on a pathfinder.

These trucks(or most of them) disengage the front driveline when in 2wd via vacuum operated hubs.
+1 - they are disengaged unless 4WD is active.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge 0W-20 + FRAM Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5114310 05/24/19 07:26 AM
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meep Online Content
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the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.


2018 F150
2015 crv (wifey!)
Re: 2015 F150 front and rear diff fluid [Re: meep] #5114920 05/24/19 07:51 PM
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hatt Offline
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Originally Posted by meep
the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.

Are the newer trucks all AWD? My 13 has an old school transfer case pretty much the same as stuff from the 80s.


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: 2015 F150 front and rear diff fluid [Re: meep] #5115135 05/25/19 05:35 AM
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Originally Posted by meep
the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.


If that is the case, I wonder why Ford does not spec. the thinner lube for the front differential also?


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: 2015 F150 front and rear diff fluid [Re: Rob_Roy] #5115291 05/25/19 09:24 AM
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Originally Posted by Rob_Roy
Originally Posted by meep
the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.


If that is the case, I wonder why Ford does not spec. the thinner lube for the front differential also?


They do, it occurred sometime after my 2015.


1999 Jeep Cherokee sport 4.0L
2015 Jeep Cherokee 3.2
2015 Ford F150 5.0
Re: 2015 F150 front and rear diff fluid [Re: meep] #5115976 05/26/19 02:20 AM
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Originally Posted by meep
the newer ones have no disconnect for the front axle.


I wonder what the reasoning was for this? Transfer case oil pump on front input shaft? LOL

Are the vacuum hubs anything less than instant/seamless in operation, such that the delay of engaging/disengaging was considered unacceptable?

Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5116001 05/26/19 05:32 AM
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Originally Posted by Buzzinhalfdozen
Originally Posted by Rob_Roy
Originally Posted by meep
the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.


If that is the case, I wonder why Ford does not spec. the thinner lube for the front differential also?


They do, it occurred sometime after my 2015.


Right you are - I just pulled out the manual for my 2016 and it calls for 75w-85 in the front.


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: 2015 F150 front and rear diff fluid [Re: meep] #5116003 05/26/19 05:36 AM
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hatt Offline
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Originally Posted by meep
the newer ones have no disconnect for the front axle. Spins full time. I have an '18 XL STX 4x4. They went away from the vacuum hubs sometime around 15 I think? There is a pretty big difference in MPG between the 2wd and 4wd. It seems they could have really helped their cafe numbers if they'd kept the vac system in there, even if it wasn't known for being that robust.

I just saw a forum post of someone with 2017 hub issues.

Actuator for 2018.

https://www.mclaughlinmotorsparts.c...tial-Lock-Motor/75136169/HL1Z3C247A.html

Last edited by hatt; 05/26/19 05:53 AM.

2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: 2015 F150 front and rear diff fluid [Re: Buzzinhalfdozen] #5117960 05/28/19 07:45 AM
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meep Online Content
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^^^ dumbfounded? I had the wheels off 2 weeks ago to rotate the tires. the axles spun with the hubs. Not sure what to make of that website, showing the vac hub for a 2018? ^^^


2018 F150
2015 crv (wifey!)
Re: 2015 F150 front and rear diff fluid [Re: meep] #5118019 05/28/19 09:08 AM
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Originally Posted by meep
^^^ dumbfounded? I had the wheels off 2 weeks ago to rotate the tires. the axles spun with the hubs. Not sure what to make of that website, showing the vac hub for a 2018? ^^^

Did you rotate the tires with the engine running? smile Unless the engine is running, there's no vacuum to release the hubs. Engine off, no vacuum... everything will spin.


2013 F150 XLT 5.0 4X4 115k
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