Do i need friction modifier? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 11-23-2009, 09:24 AM Thread Starter
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Do i need friction modifier?

I'm changing out my rear diff fluid and I'm using Lucas 75w140 Synthetic. It says on the bottle that I don't need any additives. I've also heard if you use synthetic lube you don't need to use it. Anyone care to enlighten me?

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post #2 of 7 Old 11-23-2009, 09:28 AM
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Quote:
Originally Posted by dmalmgre View Post
I'm changing out my rear diff fluid and I'm using Lucas 75w140 Synthetic. It says on the bottle that I don't need any additives. I've also heard if you use synthetic lube you don't need to use it. Anyone care to enlighten me?
This is correct. If it says you don't need additives then you wont need them

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post #3 of 7 Old 11-23-2009, 09:29 AM Thread Starter
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Just making sure, didn't wanna trash my clutches.

2004 Ford F250 SD Crew Cab 6.0 PowerStroke 4x4
-BPD Oil Cooler
-BPD EGR Cooler
-SCT Livewire TS
-SRL Tune (Gearhead Performance)
-Blue Spring Mod
-Fabtech 8" lift (dual stabilizer, dual front/single rear Fox Racing shocks)
-20" Weld Racing Wheels
-37" Toyo Open Country Tires
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post #4 of 7 Old 11-23-2009, 06:35 PM
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dmalmgre,
I'm getting ready to do mine also...got a new Oasis diff cover with magnetic drain and fill plug and a "Lube Locker" gasket. I'm gonna run the Mobil 1 75-140 synthetic. Are you going to clean the inside with non-chlorinated brake cleaner? Let me know how it goes.

Mike
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post #5 of 7 Old 11-23-2009, 06:36 PM
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I used royal purple and it already had the additive in it. There is a few guys on here that says thats bad when it already has it, but it works for me.

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post #6 of 7 Old 11-23-2009, 07:39 PM Thread Starter
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Nah I've never had to before. Just going to drain and refill. Thanks for the info guys!

2004 Ford F250 SD Crew Cab 6.0 PowerStroke 4x4
-BPD Oil Cooler
-BPD EGR Cooler
-SCT Livewire TS
-SRL Tune (Gearhead Performance)
-Blue Spring Mod
-Fabtech 8" lift (dual stabilizer, dual front/single rear Fox Racing shocks)
-20" Weld Racing Wheels
-37" Toyo Open Country Tires
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post #7 of 7 Old 11-24-2009, 09:18 AM
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With an '03 your clutches are probably toasted anyway, so they won't be grabbing much. If you do notice them grabbing in corners add 2oz modifier at a time until it goes away, add too much and your LS is worthless (stock one is anyway).

2012 F-150 XLT Ecoboost SuperCrew 6.5' 4x4
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