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Thread: Can Royal Purple with LSD additive in R154 cause harder shifts?

  1. #11
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Big danger is some additives will glaze the Syncro surface and is very hard to remove/rectify. While affected it's taking the sharp edges off the inner taper of the Brass rings which are what grip the gear to accel/decell everything. Ford makes an additive that will help in their Motorcraft range.

  2. #12
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Quote Originally Posted by gilberjj
    i read through this thread fast..... and i would go back and read it more carefully and try to better understand it..... but im supposed to be studying for 2 finals that i have tomorrow

    so now that we are on the same page as to why im asking, what are the summarizations to gear and lsd oils? i have redline mt-90, and redline 75w90. i also got a ford racing lsd friction modifier....... am i in the clear????

    Red Line MT-90 for the tranny, 75W-90 for the LSD are excellent choices. Red Line 75W-90 already has friction modifier in the formula...you should not need any additional modifier.

    The only down side I have seen with the Red Line 75W-90 LSD oil is if you have a noisy LSD, it can make it worse. If you have a worn differential, Ford 75W-90 oil and Ford friction modifier might be a better choice....you add just enough modifier to stop the LSD from chattering.
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  3. #13
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Quote Originally Posted by AGlobalThreat
    For the LSD do you just get plain old Ford LSD 75w90? Its nothing special?
    Yep...you will also need the Ford friction modifier.
    I will no longer respond to tech questions via PM. If you have a question, put it on the forum so everyone benefits from the answer.

    Quote Originally Posted by Supracentral
    However I still stand by my statement that 99 times out of 100, the weak link in the MKIII is the owner.
    Quote Originally Posted by jetjock
    I swear, it's like talking to an amoeba...


    Want to know about oil...read this:
    Motor Oil 101 - Dr AE Haas


    "Life is like a jar of Jalapeno Peppers
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  4. #14
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Update:

    Changed the manual transmission oil on my '94 Toyota truck with Red Line MT-90. Been in for 3 weeks...shifts very smooth now...I could feel the difference in shifting on the 1st drive. Previously it had a "dragging" feel going into gear and I could hear the synchros. Not a sound now...I'm very pleased with the Red Line.

    Also changed the differential oil and used the Ford 75W-90 synthetic. Had a light hum before...not a sound either. Didn't need the friction modifier. I'm equally impressed with this differential oil.

    The truck has an R22 EFI motor, 2 wheel drive, W55 tranny, open differential.
    I will no longer respond to tech questions via PM. If you have a question, put it on the forum so everyone benefits from the answer.

    Quote Originally Posted by Supracentral
    However I still stand by my statement that 99 times out of 100, the weak link in the MKIII is the owner.
    Quote Originally Posted by jetjock
    I swear, it's like talking to an amoeba...


    Want to know about oil...read this:
    Motor Oil 101 - Dr AE Haas


    "Life is like a jar of Jalapeno Peppers
    What you do today, might Burn Your Ass Tomorrow"

  5. #15
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    OK, as I now have some first hand experience in this I'll comment:

    When I first got the car it had a slight second gear grind. Tranny shop changed the clutch and tranny fluid. Same grind.

    Switched to Royal Purple Max-Gear. Shifting was smoother...until I tried to shift fast and then it would grind a bit. Didn't go away with use, and wasn't in that long.

    Switched to Royal Purple Synchromax (I know, I grabbed the wrong bottles!!). Worked about the same as max-gear at first. Went to the Austin hill country cruise and it was grinding a LOT going to second, even when going slowly. Rev matching helped, but not entirely, was also quite noisy. Tranny made some noise and did cause some "drag."

    Finally switched to Red Line MT-90. Been driving it for a week and the grind is entirely GONE. I have a bit of a click when shifting fast into second, but other than that it's smooth as butter.

    Highly recommended.

    I also run the Ford gear oil and LSD additive in the diff. It helped a lot, but I'm unsure as to how much really, as the old gear oil looked pitch black and smelled burnt. Anything I put in there might have helped...
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  6. #16
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Quote Originally Posted by ImperfectSupra
    i just purchase 6 quarts of 75w 90 moblile synthetic gear oil. is this a good choice for my 5 speed tranny and lsd.

    Mobil 1 75W-90 gear oil also contains friction modifiers and is intended for an LSD...same type friction modifiers as Royal Purple. It will be fine to use in an LSD, but not in a manual tranny...for the same reasons in post #7 above.

    http://www.mobil.com/USA-English/Lub..._LS_75W-90.asp

    Pick-up some Red Line MT-90 for your tranny...you won't regret it
    I will no longer respond to tech questions via PM. If you have a question, put it on the forum so everyone benefits from the answer.

    Quote Originally Posted by Supracentral
    However I still stand by my statement that 99 times out of 100, the weak link in the MKIII is the owner.
    Quote Originally Posted by jetjock
    I swear, it's like talking to an amoeba...


    Want to know about oil...read this:
    Motor Oil 101 - Dr AE Haas


    "Life is like a jar of Jalapeno Peppers
    What you do today, might Burn Your Ass Tomorrow"

  7. #17
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    I was at my auto parts store today to buy some replacemeny tranny fluid. I was annoyed that all of the brands of synthetic had LSD additives in it. They did not sell red line so I my only choice was havoline standard gear fluid 80-90.

  8. #18
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    Hmmm...here's several synthetic gear oils (no friction modifiers):

    Pennzoil Synthetic 75W-90 GL4
    Pennzoil Gearplus 80W-90 GL4
    Ford 75W-90 Synthetic Gear oil
    Amsoil MTG 75W-90

    (Edit Mar 08 - Valvoline changed the spec on Valvoline SynPower 75W-85 gear oil...it is now a GL-5 75W-90 & contains friction modifiers)

    Plus Red Line MT-90...well worth special order if necessary IMO.

    All of the above meet the GL-4 specification suitable for both the W58 and R154.
    There are also several non-syn gear oils that meet GL-4 requirements...and you can always go to the Dealer for an appropriate gear oil.

    Time to change parts stores?
    I will no longer respond to tech questions via PM. If you have a question, put it on the forum so everyone benefits from the answer.

    Quote Originally Posted by Supracentral
    However I still stand by my statement that 99 times out of 100, the weak link in the MKIII is the owner.
    Quote Originally Posted by jetjock
    I swear, it's like talking to an amoeba...


    Want to know about oil...read this:
    Motor Oil 101 - Dr AE Haas


    "Life is like a jar of Jalapeno Peppers
    What you do today, might Burn Your Ass Tomorrow"

  9. #19
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    I have used both the Amsoil & Redline MT-90 I liked the way the redline performed better you can still find Amsoil on shelves at Autozone if your to lazy to order the redline from Summit Racing.

  10. #20
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    Default Re: Can Royal Purple with LSD additive in R154 cause harder shifts?

    no parts stores here carry red line either, summit racing online is where I got it since they're fast and reasonable...
    2015 Subaru BRZ Series.Blue, Valenti tails, Michellin Pilot Super Sports, E85 tune

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