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Synthetic vs Conventional Diff. Lube #5185840 08/13/19 11:00 AM
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grachik Offline OP
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If my 2000 F150 is used as a passenger vehicle only, is there a huge benefit to use synthetic lube in the differential?

Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185845 08/13/19 11:03 AM
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Doublehaul Offline
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Lasts a little long and can provide a boost in MPG. Most OEMs suggest changing diff fluid around 100k or some such thing. If your doing this say every 50...id be fine with any conventional that met the spec.

Supertech syn is pretty cheap though...you may look into that


2019 Toyota 4Runner 4x4 TRD
2019 Toyota Tacoma 4x4 TRD*

Mobil 1 0w40


The specs on the back are more important than the label on the front
Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185847 08/13/19 11:05 AM
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rideahorse Offline
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Your truck will get better MPG because your billfold will not weigh as much using synthetic.

Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185850 08/13/19 11:07 AM
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Jimzz Offline
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Not a lot difference. But the price difference is pretty small if you shop around. Walmarts Supertech 75w90 and 75w140 is pretty cheap and good quality. So I run the syn in all the diffs I work on.


yup
Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185865 08/13/19 11:24 AM
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Kawiguy454 Offline
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I was a kid and the guy that raced the Ramchargers Hemi Cuda lived down the street from me. Basically he told me that synthetic diff lube was good for .14 seconds down the quarter mile. when bracket racing he would use conventional and if he had a hot race he could swap in the synth to gain that tiny bit to win the race. So yes synthetic will save fuel and not because your wallet is lighter.

Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185931 08/13/19 12:36 PM
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i had a 92 dodge Dakota v6 i put in a limited slip carrier. put in stay lube syn and immediately got 20 miles per tank. that continued for the next 100k. that was huge because it had a tiny tank. i went from needing to fuel at 150 pulling the boat to fuel at a 160 and 200 empty to 220 miles. i could pull the boat down to the lake and fish and back on one tank.after that. Just barely could not make it before..

rod

Last edited by ragtoplvr; 08/13/19 12:38 PM.
Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5185947 08/13/19 12:48 PM
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benjy Offline
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just like engine oils real synthetic drivetrain lubes excell! changed all drivetrain lubes to redline in my new to me 28 thou 2011 frontier SV V-6 4wd + netted 3 mpgs or so, used the 75-90 in the dana-nissan rear as recommended by dana, a real synthetic 75-90 on danas site not the 75-140 OE syrup which was semi-syn + just as costly. the redline MT-90 shifts so much better in my traded 200 thou jetta + now my 2001 audi TT, there IS a difference beside price + longevity IMO!!

Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5186042 08/13/19 02:21 PM
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The price difference isn't THAT great. Because I do it every 100K miles (so, twice) on my Tacoma, I use synthetic. You can catch it on sale.


02 Tacoma 3.4L, 233K, Hav ProDS 10W30 (me)
12 Highlander 3.5L, 115K, Napa Syn 0W20 (wife)
17 Escape 2.0L, 53K, P66 Shield Choice SynBlend 5W30 (son)
Re: Synthetic vs Conventional Diff. Lube [Re: ragtoplvr] #5186119 08/13/19 03:27 PM
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Originally Posted by ragtoplvr
i had a 92 dodge Dakota v6 i put in a limited slip carrier. put in stay lube syn and immediately got 20 miles per tank. that continued for the next 100k. that was huge because it had a tiny tank. i went from needing to fuel at 150 pulling the boat to fuel at a 160 and 200 empty to 220 miles. i could pull the boat down to the lake and fish and back on one tank.after that. Just barely could not make it before..

rod
Seriously? Installing synthetic gear lube upped your mileage by 20 miles per tank?


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: Synthetic vs Conventional Diff. Lube [Re: 2015_PSD] #5186120 08/13/19 03:31 PM
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kschachn Offline
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Originally Posted by 2015_PSD
Seriously? Installing synthetic gear lube upped your mileage by 20 miles per tank?

I think that is not possible, especially considering the two lubricants may very well have chemically identical base stocks.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Synthetic vs Conventional Diff. Lube [Re: kschachn] #5186141 08/13/19 03:51 PM
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Originally Posted by kschachn
Originally Posted by 2015_PSD
Seriously? Installing synthetic gear lube upped your mileage by 20 miles per tank?

I think that is not possible, especially considering the two lubricants may very well have chemically identical base stocks.
From point of view, it is not possible even if they have different base stocks unless, of course, the viscosity changed from xW-600 to xW-90.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5193095 08/21/19 03:59 PM
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From what I have read on the topic, here is my understanding of conventional vs synthetic:

-- From a strictly "base stock" perspective, synthetic oil does not lubricate better than conventional. If there is an improvement in lubrication (more MPGs, more power, cooler running temperatures or something else), it's the additive package that makes the finished product a better lubricant. Synthetic oils being premium products, they often have better additive packages -- this includes improved detergent and dispersant package, so synthetics tend to keep engines cleaner, and they can clean up dirty engines quicker than doing more frequent changes with conventional.
-- Under equal operating conditions, synthetic oil lasts longer because it's better at tolerating high heat and shear, and generall resists breakdown better than conventional over time.
-- With the same viscosity, synthetic flows better at very low temperatures and thins less at very high temperatures (viscosity stable).

Modern conventional oils are excellent oils and I won't fault anyone for running conventional if it meets the manufacturer's requirements. But considering the small price difference, I think it is better to run synthetic. And when name-brand synthetic motor oil can be had cheaper (after rebate) than conventional, it is a 100% no-brainer decision for me.


1995 Corvette coupe LT1 6-speed
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1999 Yamaha YZ400FL
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Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5195978 08/25/19 07:36 AM
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The MPG benefit with synthetic would come particularly when the oil is cold as the synthetic will be much thinner than the mineral.

At 0 Deg C an 80W90 mineral is typically 2500 cSt. vs 750 cSt for a synthetic 75W90. If you happen to do a lot of short commutes and the oil rarely gets hot that will increase the mpg benefit of using synthetic.

I do a daily short commute all year round on my motorcycle and after changing to synthetic in both gearbox and final drive there was a vast reduction in oil drag felt by spinning the rear wheel by hand both before the ride and after.


Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (MB oil 229.5 5W40)
Re: Synthetic vs Conventional Diff. Lube [Re: grachik] #5195980 08/25/19 07:39 AM
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I don't get why a lot of rear end rebuilders recommend conventional over synthetic. I get using conventional for a short break-in for cost reasons. I followed the instructions of my rear end builder, but now a year or more out, i'm thinking of syn.

For towing i'm running the 140 wt.

Last edited by spasm3; 08/25/19 07:40 AM.

13 elantra 84k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 19000 miles m1 0w30
Re: Synthetic vs Conventional Diff. Lube [Re: spasm3] #5196095 08/25/19 10:11 AM
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Originally Posted by spasm3
I don't get why a lot of rear end rebuilders recommend conventional over synthetic. I get using conventional for a short break-in for cost reasons. I followed the instructions of my rear end builder, but now a year or more out, i'm thinking of syn.

For towing i'm running the 140 wt.



I’m no rear gear oil expert by any means
But I read a couple of months ago on a 4x4 forum of a guy who builds rear ends. He recommends conventional gear oil over synthetic for the greater shock load that conventional has over synthetic. Maybe that’s true

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