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  1. #1
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    Yes | No

    I don't want to start an argument, but . . . . > >

    What are the gear lube recommendations for a non-limited slip differential. I've played with the Search engine but as you well know, it sux. It appears that it needs to be a 75W-90 GL-5 lube which meets the BMW SAF-XO specification - whatever that is.

    I was planning to go with an appropriate Redline or Royal Purple fluid but again, the compatibility specs are less obvious than ATF or engine oil specs.

    I'm sure there are several good choices but at 80,000 miles on the original "Lifetime" gear oil, I think it's time for a change.

    I know this had been answered dozens of times but I can seem to find a single one of them.

    Your indulgence is appreciated.




    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
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    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
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    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired


  2. #2
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    Yes | No

    RedLine is GL-5 rated>>

    http://www.redlineoil.com/product.aspx?pid=133&pcid=4

    My local dealer used to sell ('04) the BMW stuff in bulk: bring a clean plastic jug, and they'd sell it by the liter.

    P/n 83 22 1 467 993. At the time, it was $18/l.
    Ed in San Jose. BMW CCA member since 1987 (Nr. 62319). Golden Gate Chapter. '97 540i 6 speed. Build Date 3/97. Aspensilber over Aubergine leather.

  3. #3
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    Yes | No

    I use Lubro Moly 75W-90. GL-5, made in Germany

    by Liqui Moly which is very reputable european manufacturer. I've also been using their engine and ATF oil for 6 years now. Basicaly, It's popular in Europe as much as Redline is here.
    http://www.autohausaz.com/search/pro...&utm_term=2048



    1998 BMW 540i 6 speed
    Arctic silver, M sport suspension (euro delivery), prod. date 05/98, non VANOS
    Staggered 18" style 32 OEM wheels
    3.15 open differential
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    AFE CAI with improved heat shield
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    1997 BMW 528iA
    Alpine white, premium package, prod. date 04/97, single VANOS
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    Debadged
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    Custom made sun blinds for rear seating area

    2000 Nissan Frontier Desert Runner, AKA "The Work Horse"

    Garage aids:
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    Actron 9135 scan tool-for quick readouts



  4. #4
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    Yes | No

    I have used Royal Purple SynchroMax but switched(m

    to Redline after I installed the M5 diff in my car.
    Any of the 3 above would be OK.

  5. #5
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    Yes | No

    Thanks guys. Great recommendations all. > > >

    I decided to go with the Redline High Performance Gear Oil. They are all fine products but I can get the Redline delivered for a few $$ less than either the Lubromoly or the RP products and I'm certainly comfortable with the Redline family of products.

    Note to Jim: the RP Synchromax is their manual transmission lubricant. The RP Max-Gear is their GL-5 gear oil.

    Life would be a lot more complicated without the support you guys provide on Roadfly.

    I owe you.



    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  6. #6
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    Yes | No

    OOPS, meant to say Max Gear not SynchroMax






    "Drive It Like You Stole It, A Sickness for Quickness"
    The Bottle Rocket "King of Spray" 2 Stage Nitrous Oxide
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  7. #7
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    Yes | No

    Are you using the Max-Gear in your differential ?




    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  8. #8
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    Yes | No

    I was until I put the M5 diff in, then I switched(

    to Redline 75W140 which is the correct weight for this diff.
    75W-90 is the correct stuff for your diff.

  9. #9
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    Yes | No

    I'm all over it. Thanks Jim.




    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  10. #10
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    Yes | No

    If you still prefer the Royal Purple > >

    they make a Max-Gear in 75W-140.

    I'm guessing this is probably not news to you but thought I'd pass it along anyway.


    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  11. #11
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    Yes | No

    While we're on the subject, what are the > > >

    correct hex wrench sizes for the fill and drain plugs on the differential? I'd like to be sure I have those on hand before I levitate the car to drain the gear oil.


    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  12. #12
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    Yes | No

    Switched to RL Bcuz it had better shear properties






    "Drive It Like You Stole It, A Sickness for Quickness"
    The Bottle Rocket "King of Spray" 2 Stage Nitrous Oxide
    Dare to be different and stand out among the crowd of me-to-cars!
    No guts, no glory! Tire smoke, not traction control!
    Zionsville all aluminum radiator to replace the 3 leak prone Nissens Radiators!

    NOS Progressive 2 Stage Controller with port injection
    Snow's Performance Methanol/Water Injection
    Dinan downloads, VAC Under Drive Pulleys
    Dinan Carbon Fiber CAI
    Dinan Front Strut Bar
    Electric Cooling Fan w/PWM controller
    NGK Iridium Plugs
    DDE Enhanced Angel Eyes, Smoked Lenses
    Koni FSD's/H&R Springs, BAV Brass Caliper Bushings
    Eisenmann Race Exhaust (from H8-Rain's car)
    ///M5 3.15 LSD
    ///M5 Sway Bars, Front & Rear
    Energy Suspension Polyurethane Sway Bar Bushings
    ///M5 Gauge Cluster Rings ///M5 Lip Spoiler
    ///M5 Mirrors and Switches
    Leather Z weighted shift knob (thanks H8-Rain)
    Rogue “Octane” Short Shift kit w/WSR
    Rogue Tranny Mounts
    StopTech Brake Lines Front & Rear
    Axxis Deluxe Plus pads Front & Rear
    Staggered M Parallel 66, Xenons
    Modified CDV, UGDO
    Euro Storage Tray (thanks Zombywolf)
    Redline in Diff and Tranny
    Passport 8500 X50, Escort ZR3 Laser Jammer
    G-Tech/Competition Pro Data Logger
    Auto Enginuity OBD-II Scan Tool
    25% Tint, X-Pel, LoJack
    PIAA Driving Lights
    BMW CCA Member Boston Chapter

  13. #13
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    Yes | No

    Both are 14mm. I got a 3 pack of 1/2" drive (m)

    from AutoZone for about $11
    It had 12, 14, and 17mm in it. Don't forget to get new aluminum crush washers.

  14. #14
    Eurodavid
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    Yes | No

    new alu crush washers, or ditch 'em &the old plugs

    and go with the new differential plugs BMW made. I did a mini FYI writeup on them, and I think they are fantastic as the new seal is built into the plug and they seal great against the differential. Cost me like $4 for each new plug, iirc. (not to say that the old plugs are bad, but alu crush washers on diffs are a thing of the past, for the very reason they degrade over time---check these pics of the old alu washers on the diff when taken off:









    Here's pics, old plug on the left, new plug on the right:









    The new plugs have a lot going for them, i.e., pay close attention the interior of the plug, how they are beveled and machined, so that in the future, you don't have to fight (if your plugs are a bit corroded) to get the 14mm hex in there. Plus, the depth of them and the way they are threaded up to the rim versus the older plugs. They just seal all around better, and you feel it putting them in versus putting one of the old ones back in.

    Eurodavid

    P.S. Filehorse, I know this is not what you may want to hear & may cause others to go apoplectic, but any, I repeat ANY differential fluid that is new will suffice. The key, like the tranny, is that it is "new". Buy the cheapest 75w-90 gear lube oil, and you will be fine. I find it much better to buy 2-3 bottles of the least expensive stuff (i.e. Quaker State makes some great, inexpensive 75w-90 gear lube oil that is just as good as any gear lube 2-3 times its price), and change the diff fluid every 15-20k. Plus, if you do two flushes of diff fluid within 15k, you differential will love you that much more (and be that much cleaner) than if you just did it once and wait another 25-35k to do it again.

  15. #15
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    Yes | No

    The new plug looks very similar to the fill & > >

    drain plugs on my ZF 5HP19. I do like the new design. I'll probably "invest" in a couple of those for the diff. Thanks for the heads-up.

    I don't disagree about the choice of differential gear oil and certainly if you are going to change it very often. I'm going with the Redline and I'll probably put the diff on the same 40,000 mile schedule as the transmission.


    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  16. #16
    Registered Member
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    Yes | No

    With that beast lurking under your hood, that's >

    good logic. It needs all the help it can get.


    Filehorse
    Knoxville, TN
    BMWCCA #407627

    2002 525i Steptronic Sport/Premium | Build Date: 05/02
    81,000 Ultimate Driving miles
    Xenons
    Style 81s | Bridgestone Potenza RE960 AS
    Titanium Gray | Gray Leather
    35% LLumar ATR LLumaStar tint
    Valentine 1 | Hardwired
    Steering wheel position memory w/Alzheimers
    "Lifetime" ATF replaced at 40,000
    StopTech SportStop slotted rotors w/Axxis Deluxe Advanced pads
    StopTech SS Braided Brake Lines

    2001 E46 325i (Jet Black) Forced Retirement 6/28/09

    2001 E46 325i (Orient Blue) Forced Retirement 10/09

    1989 E30 325i (Alpine White) Retired

  17. #17
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    Yes | No

    If you're investing in drain plugs, get the best

    The BavAuto drain plugs have the new O-ring and a magnet.

    BavAuto, where Bavarians shop
    Vin
    98 540 Sport with everything & extra hots
    BMW CCA, Boston Chapter
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  18. #18
    Bimmer5Michael
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    Yes | No

    I used Royal Purple 30K miles ago

    Sems to be just fine

    Michael
    00 540i Sport 6 speed

  19. #19
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    Yes | No

    Haha, was just looking at those!



    Viv
    Northern California
    2003 530i Steel Blue Metallic /Gray leather
    AT/PP/SP/CWP/Xenon/Folding Rear Seats/Ultimate Cup Holders/Stongard Headlamp Covers/Stealth rear signal bulbs/50% tint/Saab trunk lid handle/PS2s/Aux. adapter/BMWCCA Member/With a Pink Panther on the mirror/E34('91 525i) retired

  20. #20
    Eurodavid
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    Yes | No

    Vin, I can't get your link to work..what am I

    doing wrong? They sound great, especially if a super-strong magnet is built right into them. I use the world's strongest known magnets in my tranny pan---you can get two of them if you have any old hard drives laying around--each IDE or SATA hard drive has two of them in it, and they fit perfectly in the tranny pan (fastening them in there was a bit of a trick, though). Each of those hard drive magnets (about size of your pinky sliced in half horizontally) will lift something like 18-20 pds to over 50 ft in the air---they're really impressive. Only thing is gotta be careful messing with these things; for example, if you get any finger skin between metal and those magnets, they will literally pinch the skin right off as they glob on to the metal like instant superglue.

    Eurodavid

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