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 2Likes
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Post By jeffnolan
10-21-2015, 07:08 PM
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CC Member
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Join Date: Jun 2004
Posts: 204
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Not Ranked
What Gear Oil Do You Run In Your BDR...
Seems some prefer 75w90 while other recommend 75w140. A lot of sources on line love Red Line Synthetic Gear Oils.
Just curious to what BDR owners are running as I'm about to swap rear ends for an LSD unit. |
10-21-2015, 08:16 PM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,121
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Not Ranked
Royal Purple 75w90.
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10-22-2015, 01:34 PM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Redline 75w140
Kevin....
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10-22-2015, 01:44 PM
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CC Member
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Join Date: Jun 2015
Cobra Make, Engine: Backdraft #91 with 345 HP 302
Posts: 181
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Not Ranked
No offense to anyone else, but Cashburn deals with a ton of Cobra's. I am going to side with him on this one, despite what the other members say. I mean, I respect the fact that what they post has worked for them...but that is one car. Cashburn has lots of cars going thru his shop...his opinion, to me, packs more weight.
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10-22-2015, 01:57 PM
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CC Member
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Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
Posts: 645
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Not Ranked
Lucas 80w-90 Heavy Duty High Performance Non Synthetic gear oil...I don't have clutches in my differential.
__________________
Lou
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10-23-2015, 12:32 PM
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CC Member
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Join Date: Oct 2013
Cobra Make, Engine: Backdraft #1333, Smeding 427
Posts: 93
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Not Ranked
BMW recommends 75w140 for limited slip differentials and 75w90 for open diffs.
Quote:
Originally Posted by Cashburn
Royal Purple 75w90.
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10-25-2015, 05:43 PM
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CC Member
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Join Date: May 2005
Posts: 379
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Not Ranked
Quote:
Originally Posted by Winchester67
No offense to anyone else, but Cashburn deals with a ton of Cobra's. I am going to side with him on this one, despite what the other members say. I mean, I respect the fact that what they post has worked for them...but that is one car. Cashburn has lots of cars going thru his shop...his opinion, to me, packs more weight.
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You can feel that way if you want...  
This is simple. It is gear oil, period. Brand is not material as long as it is a proper spec oil. These are BMW's , not Cobra's...street cars. It takes YEARS to see the results of any faulty lubricant...and you won't, don't sweat it.
The actual difference in viscosity from 90 wt to 140 wt is miniscule for your purposes.
Don't over complicate a simple thing! |
10-25-2015, 08:23 PM
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CC Member
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Join Date: Oct 2013
Cobra Make, Engine: Backdraft #1333, Smeding 427
Posts: 93
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Not Ranked
It takes years to see the results.... case in point, it took BMW 10 years to change the spec on LSDs to 75w140. Prior to that they were recommending 75w90 in everything.
Quote:
Originally Posted by cbreez
You can feel that way if you want...
This is simple. It is gear oil, period. Brand is not material as long as it is a proper spec oil. These are BMW's , not Cobra's...street cars. It takes YEARS to see the results of any faulty lubricant...and you won't, don't sweat it.
The actual difference in viscosity from 90 wt to 140 wt is miniscule for your purposes.
Don't over complicate a simple thing! |
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10-26-2015, 06:16 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,121
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Not Ranked
We use what the company that builds our LSDs says to put in them.
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10-26-2015, 04:17 PM
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CC Member
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Join Date: Oct 2013
Cobra Make, Engine: Backdraft #1333, Smeding 427
Posts: 93
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Not Ranked
@cashburn, are your LSDs the same one that Backdraft is selling on the parts website?
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10-26-2015, 04:49 PM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,121
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Not Ranked
Quote:
Originally Posted by jeffnolan
@cashburn, are your LSDs the same one that Backdraft is selling on the parts website?
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I don't know what they are selling at that price. Ours are built by diffsonline. |
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