[DeTomaso] ZF oil choice?

[L GRAY]

      OK guys.............here it goes. I (we) at Vehicle Performance Center here in Arizona where I work , have been using Redline 75-90 NS for the last 15 years in every ZF we service or ones which I rebuild. We have noted much longer synchronizer life and much better limited slip lock engagement with much less "slip" which equates to less heat build up.
       The reason is the LACK of the limited slip additive used to quiet down the LS noise/chatter which, as stated , many manufacturers use. This additive DOES NOT enhance limited slip performance , to the contrary .......it degrades the speed at which the limited slip goes to its maximum locking capabilities because it is extremely slippery stuff that will not allow the LS to groan or chatter as it engages ie: customers won't complain about odd noises when they turn their vehicle and the two rear wheels turn at different rates which begins to activate the limited slip.
       Now go one step further and guess what this ultra slippery goo does to your synchronizer rings ability to lock up on it's tower?????  Lets see . . . .   slippery stuff - sync slips instead of grabbing - heat goes up - synchronizer ring  degrades more rapidly because of grater slippage and heat generated before it finally grabs and locks up.

 The ZF synchronizers require a good bit of friction  as it is being applied by the synchronizer slider ring in order to "grab" the towers and lock up. Too slippery - longer time for the item to fully stop the gear and this will accelerate the speed of synchronizer and tower wear . . . . .  great for my business , bad for your wallet.
        I know that some will disagree with me and continue to follow the flock (and that's OK because different opinions are what makes us better and the dialog can lead to more information which can change minds ....even mine!!) but folks, I spoke with the people at Redline on this subject at length years ago and will stand behind using this oil until I take my dying breath.
                                                                                    Les Gray
                                                                                     02823
 ..................................................... incoming ! ! ! ! ! ! 
        
  ----- Original Message ----- 
  From: JDeRyke at aol.com<mailto:JDeRyke at aol.com> 
  To: bflesland at gmail.com<mailto:bflesland at gmail.com> 
  Cc: detomaso at realbig.com<mailto:detomaso at realbig.com> ; pantdino at aol.com<mailto:pantdino at aol.com> 
  Sent: Saturday, April 02, 2011 2:08 PM
  Subject: Re: [DeTomaso] ZF oil choice?


  In a message dated 4/2/11 8:36:43 AM, bflesland at gmail.com<mailto:bflesland at gmail.com> writes:

  > So does that mean you recommend LS gear oil if your LSD is still intact 
  > in the ZF?
  > Cheers Bjoern
  > 
  Yes= always. And a direct quote from Lloyd Butfoy on the subject is, 'Using 
  'Posi-Lube' (traction additive) in your ZF won't hurt, and may help". 
  Nowadays in the U.S, most differential lube says "For Posi-type differentials", 
  which covers the ZF LSD and is handy: no extra additive needed. Note the 
  additive has nothing to do with the quality of shifting, only the working of the 
  limited slip clutches. FWIW, many synthetics will leak from older design 
  transmissions since their seals & gaskets weren't made to cope with synthetic 
  oils. Not all leak but its unpredictable until you try. If you get a leak, 
  drain the stuff and refill with non-synthetic lube; most leaky seals 
  eventually dry up and stop leaking without rebuilding. Good luck- J Deryke
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