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This thread, is about gearoil and the aditiv Slick50 that came out in the 90's? Some stuff that has PTFE in it.. After 20 years of driving a 5 speed (30000km) the gears are making a lot of shifting noise.. again.. Going back from 4 or 5 to 2th is almost impossible to do. @Pilgrim you askt: Are you double - clutching your downshifts? I sure would be. It greatly reduces the work of the sync rings. I do it now by reflex on my ZX. I drive z and zx now for almost 30 years and never double clutched gears.. i have tried it with my problem gearbox but it's so bad it does not help much.. the gears seam to be rolling long after i activated the clutch.. from another thread, @Zed Head ZED HEAD sayd: I remember. It has PTFE particles in it to minimize friction. Synchros need a balance between friction and viscosity to allow the speed matching to occur. If you want to take a chance with $50 I'd try the AC Delco Friction-modified Synchromesh before tearing the transmission down. I'd just let the other stuff drain out and refill with Synchromesh. Otherwise, there's a post on Hybridz about modifying Porsche synchros to work in the steel synchro 5 speeds. I think that FS5C has steel instead of "brass" (yellow). https://slick50.info/manual-gearbox-treatment/ http://skepdic.com/slick50.html https://www.ftc.gov/news-events/press-releases/1996/07/quaker-state-ads-slick-50-are-false-and-misleading-ftc-charges https://forums.hybridz.org/topic/92246-to-people-with-experience-with-the-datsun-comp-5-speed-need-parts-for-one/ zedhead says: Slick50. Based on how synchro gears work, that seems like a not-good choice for transmission fluid. Yes i agree, now after 20 years the slick50 stuff with it's PTFE (polytetrafluoroethylene) is much to "slick" for the datsun gearboxes.. If i go back some gears i can hear clearly how the gears are still spinning after a few seconds hitting the clutch! After that i push the lever carefully in the direction of the gear i want to get shifted into and it will without any bad noises. It is absolutly possible that a refill with proper GL-4 oil could make a big difference.. As my 240z is at the moment in storage i will test this next year.. (Next year my 240z will be 50 year old and doesn't need anylonger a APK (a dutch MOT.) it's... if you ask me crazy but true.. ( In the Netherlands cars over 50 are so good they don't need a check for safety... but that's a different story.) Zedhead also sayd (in other thread): Pennzoil's brand seems to work just as well. Internet has it that Pennzoil developed the formula for GM (AC Delco). I wonder how Dutchzcar managed to find Slick50 in The Netherlands. If the ac delco is like pennzoil , i could try that. The slick50 was for sale at a dutch autoparts store.. (were i get all my oils and stuff.) The gearbox i use here is a FS5C71B, (orig 5 speed euro 240z gearbox) it's about 50 years old and Never restored or taken apart.. i know it's got the Porsche synchro's in it. (I don't know it those are brass or steel.. i somehow think i seen some in brass somewhere...)