Mobil 1 and friction modifier
Thread Starter
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Joined: Jul 2002
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From: Sterling VA
Mobil 1 and friction modifier
I feel stupid asking, but... should i still add the friction modifier when i drain and add Mobil 1 Synthetic to the diff? Being synthetic i'm guessing its good to go on its own, but better safe than sorry! :rolleyes:
-Rich
-Rich
Safety Car
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From: Wilmington NC
Re: Mobil 1 and friction modifier (rhawki)
I feel stupid asking, but... should i still add the friction modifier when i drain and add Mobil 1 Synthetic to the diff? Being synthetic i'm guessing its good to go on its own, but better safe than sorry! :rolleyes:
-Rich
-Rich
Here is all Mobil has to say about it:
Mobil 1 Synthetic Gear Lubricant provides the following advantages and benefits:
Outperforms all conventional gear lubricants
Maximum protection of differentials
Exceeds requirements of all automobile and truck rear axles
Minimizes wear and spalling in racing and high-performance cars
Subzero flow down to -50°F (-46°C)
Maximum resistance to breakdown from heat and extended high speed
Excellent limited-slip performance
Extended service life
Improved vehicle fuel economy
Indy 500-certified performance
If you put it in and you have noise on sharp turns you can always add a small amount of modifier from GM... Or you could just add RedLine because they very plainly state that the modifier has been added. I went with Redline.
Safety Car
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From: Greenville NC
Re: Mobil 1 and friction modifier (rhawki)
Some people in the past thought that Moble 1 syn and the GM friction modifer didn't mix well and would separate in time. The "fix" was just to use Redline or Amsoil (that already contain the friction modifier in them) or go back with GM fluid with friction modifier.
Le Mans Master
Joined: Dec 2000
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From: Hot Springs AR
Re: Mobil 1 and friction modifier (ncvetteman)
... thought that Moble 1 syn and the GM friction modifer didn't mix well and would separate in time...
It's just easier to drop in a bottle when adding the diff fluid than filling it, driving around listening for noises, adding a little additive when necessary, etc.
Have a good one, :seeya
Mike
Burning Brakes
Joined: Apr 1999
Posts: 947
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From: Lake Worth. Fl.,USA Fl
Re: Mobil 1 and friction modifier (rhawki)
I used Mobil One and GM Friction modifier and it made noise on parking lot turns. Redline was excellent , and so was Castrol synthetic syntec differential fluid. No noise at all with Castrol or Redline. I used FM in both applications.
Burning Brakes
Joined: Mar 2000
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From: San Jose, CA
Re: Mobil 1 and friction modifier (rhawki)
That is not a stupid question at all! I have used Mobil One synthetic gear oil 75w-90 and friction modifier. I also did an E Mail and asked Mobil 1.com. Their answer was to use the friction modifier with Mobil One. The friction modifier % by service manual specification is app 6.25% (4oz for app 64 oz of gear oil) Redline and Amsoil have the friction modifier already in the blend, but I am not sure if it is a 6% blend. But you have to be careful which one you get of course.
[Modified by ruking1, 1:55 PM 8/13/2002]
[Modified by ruking1, 1:55 PM 8/13/2002]
Drifting
Joined: Jul 2000
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From: South Florida
Re: Mobil 1 and friction modifier (ruking1)
With the later model C5s 99+, GM went with synthetic in the rear diff (this from C5-TECH).
So they are using/requiring synthetic with the friction modifier.
I'm just wondering what synthetic gear oil they are using... Mobil1?
Don
That is not a stupid question at all! I have used Mobil One and friction modifier. I also did an E Mail and asked Mobil 1.com. Their answer was to use the friction modifier with Mobil One. Redline and Amsoil have the friction modifier already in the blend. But you have to be careful which one you get of course.
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Team Owner
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From: At the beach in little Rhody
Re: Mobil 1 and friction modifier (don527)
Be careful of a couple of things. One is mixing brands (Redline not compatible with some others due to oil base) and putting in too much modifier. You will reduce or possibly eliminate your limited slip capability with too much modifier. 4% is about the right amount.
Melting Slicks
Joined: Jun 2001
Posts: 2,565
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From: Chicagoland Illinois
Re: Mobil 1 and friction modifier (don527)
Don:
Eggsellent question...C5Tech told me the additive was in it from the factory but I am curious if GM runs Mobil1 gear lube or not...anyone??? :chevy :flag :seeya
Eggsellent question...C5Tech told me the additive was in it from the factory but I am curious if GM runs Mobil1 gear lube or not...anyone??? :chevy :flag :seeya
Le Mans Master
Joined: Dec 2000
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From: Hot Springs AR
Re: Mobil 1 and friction modifier (silversport)
...I am curious if GM runs Mobil1 gear lube or not...anyone???
Have a good one,
Mike
Instructor
Joined: Apr 2002
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From: Annandale NJ
Re: Mobil 1 and friction modifier (ronnie948)
Do Not add anything to the Mobil 1 Motor oil. It is all you need. :cheers:
I used Mobil1 gear lube and added the friction modifier. Works fine.
:cheers:
Thread Starter
Advanced
Joined: Jul 2002
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From: Sterling VA
Re: Mobil 1 and friction modifier (mbtc5vette)
He's asking about Mobil 1 differential oil/gear lube, not motor oil. :rolleyes:
j/k :D
Seriously though - thanks for the replies everyone! :cheers:
As i already have some Mobil 1 laying around, i may try it with the FM and see how it goes. If i dont like it i'll prolly go RedLine.
-Rich
Drifting
Joined: Feb 1999
Posts: 1,481
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From: San Diego CA
Re: Mobil 1 and friction modifier (rhawki)
The Mobil 1 synthetic gear lube works great in the C5 rear end. You do need to add the friction modifier, as others have noted. The GM specs say one bottle (4oz I think) for a full diff fluid change.
I've been running this for quite a while on the street and track (high temps, no coolers) and the diff continues to operate well with no chatter.
Mike :flag
I've been running this for quite a while on the street and track (high temps, no coolers) and the diff continues to operate well with no chatter.
Mike :flag
Team Owner
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
Re: Mobil 1 and friction modifier (Mike Schriber)
Last year one of the Techs posted that on some C5's, any synthetic dif fluid would start making noise in turns after a few thousand miles, no matter what brand of synthetic he tried and whether or not he used the GM modifier. He called GM and they told him to just use non-synthetic diff fluid if that problem occurred. However, best to have the dealer do that if you are under warranty, that way they can't blame future problems on you. Personally, mine has been doing great with GM synthetic fluid and modifier.
