January 12, 20169 yr comment_484465 Great, I just put in Lucas in both my Z and WRX! They scored worst in almost all categories. Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484465 Share on other sites More sharing options...
January 12, 20169 yr comment_484475 You have be carefull with Scoobies. They use special formulations for the Transaxle and Transfer case. Best to cheek with Scoobie forums on what's best to use. Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484475 Share on other sites More sharing options...
January 12, 20169 yr comment_484477 Does anyone know why Bob Is The Oil Guy? Isn't it just another forum with people like us on it? I see articles with names attached, but no credentials. And who, exactly, is Bob? Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484477 Share on other sites More sharing options...
January 12, 20169 yr comment_484479 On 1/12/2016 at 7:34 PM, Zed Head said: Does anyone know why Bob Is The Oil Guy? And who, exactly, is Bob? Every now and then I come across that "forum" website and I wonder the same thing. It's jusg a feeling, but my subconscious keeps telling my not to trust it. Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484479 Share on other sites More sharing options...
January 12, 20169 yr comment_484483 On 1/12/2016 at 5:34 PM, Chickenman said: You have be carefull with Scoobies. They use special formulations for the Transaxle and Transfer case. Best to cheek with Scoobie forums on what's best to use. I read on several forums (NASIOC,FastWRX, CTSubie) that Lucas was OK. I just wish I'd seen that lab report before. There are guys who make a "cocktail" of different brands and they say it's better. Edited January 12, 20169 yr by SurferD Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484483 Share on other sites More sharing options...
January 13, 20169 yr comment_484490 On 1/12/2016 at 10:02 PM, SurferD said: On 1/12/2016 at 8:35 PM, EuroDat said: Every now and then I come across that "forum" website and I wonder the same thing. It's jusg a feeling, but my subconscious keeps telling my not to trust it. Start reading BITOG a bit more thoroughly and regularly. Credentials are self evident when you start reading and researching enough. BITOG is probably the MOST respected oil forum on the Internet. Lots of sources to it and references It's regular contributing members are active and retired Chemical, Mechanical, Aircraft and oil engineers. from Shell, Mobile, Chevron. Amsoil, Pennzoil to name just a few. As well a independent Labs such as Blackstone who regularly submit articles to the Tech pages as well as being active in forums. Edited January 13, 20169 yr by Chickenman Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484490 Share on other sites More sharing options...
January 13, 20169 yr comment_484491 Who is Bob? Bob Winters. Started the Forum back in 2002 to attract Technical minded people to participate and provide FACTUAL information to enthusiasts. http://www.amsoil.lube-direct.com/2013/11/bobistheoilguy-review/ The more research you do into BITOG the more you should appreciate it's value to the Automotive Community. BITOG has regular sessions where Engineers will participate on the forum and they even host Chat Sessions. I tend to trust engineers with degrees over some " Fan Site ". You get to know who is spouting BS after a while. That doesn't happen too often on Forums where engineers frequent. Misinformation gets corrected in a hurry. Just my .02c http://synthetics.pennzoil.com/bitog-qanda-with-shell-technical-team/ Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484491 Share on other sites More sharing options...
January 13, 20169 yr comment_484492 Quote I read on several forums (NASIOC,FastWRX, CTSubie) that Lucas was OK. I just wish I'd seen that lab report before. There are guys who make a "cocktail" of different brands and they say it's better. Ya gotta be careful with making those " Cocktails ) Different additives in gear and Transmission oils can cause incompatibility issues and even make protection worse. Not something that I would choose to do, nor is it recommended by any Gear Lubricant manufacturers. Particularly those with High Pressure additives. Mix the wrong stuff and you can kiss your Tranny or Transaxle goodbye. You're usually OK mixing different weights between the same manufacturer. And such things as using some NS Diff oil with regular Diff oils to adjust posi slip. But be wary of mixing gear oils from different manufactures. Just my .02c.. FWIW Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484492 Share on other sites More sharing options...
January 13, 20169 yr Author comment_484499 Thanks for the tip on the GM Synchromesh Friction Modified Transmission Fluid. I googled it and it does have a lot of favorable reviews. Folks seem to think its a magic elixir, especially if the transmission is acting up. But since nothing is wrong with my transmission, I think I'm going to play it safe and try the Redline MT-90. That is, if Bob the Oil Guy approves. Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484499 Share on other sites More sharing options...
January 13, 20169 yr comment_484526 On 1/13/2016 at 2:45 AM, Chickenman said: Ya gotta be careful with making those " Cocktails ) Different additives in gear and Transmission oils can cause incompatibility issues and even make protection worse. Not something that I would choose to do, nor is it recommended by any Gear Lubricant manufacturers. Particularly those with High Pressure additives. Mix the wrong stuff and you can kiss your Tranny or Transaxle goodbye. You're usually OK mixing different weights between the same manufacturer. And such things as using some NS Diff oil with regular Diff oils to adjust posi slip. But be wary of mixing gear oils from different manufactures. Just my .02c.. FWIW I agree it's risky, these guys think they know more than a lubrication engineer. Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484526 Share on other sites More sharing options...
January 18, 20169 yr Author comment_484791 I am going to try the Red Line MT-90 in my transmission. Would the Mobil 1 75W-90 synthetic GL-5 gear oil be ok in the differential? Or is there a better alternative? Just thought I'd ask this time before I change the oil! Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484791 Share on other sites More sharing options...
January 18, 20169 yr comment_484793 The Mobile 1 75W-90 GL-5 should be fine for the diff. The Redline MT-90 Synthetic should be fine for your transmission. But, if you find any of the gears a bit " scratchy " with the MT-90, you may find that the GM Friction Modified fluid is even better. My Audi A4 Quattro with Brass sychros shifts much easier on the GM fluid than Redline MT-90 ( or Amsoil MT Fluid ). As does my 83 280ZX 5 speed ( brass synchros ) and my friends 2006 Infinity G35 Coupe with 6 speed manual. He was astounded at how much better the GM FM fluid was over the Nissan Factory fill. Just saying from personal experience... Link to comment https://www.classiczcars.com/forums/topic/53096-gl-4-vs-gl-5-gear-oil-in-transmission/?&page=2#findComment-484793 Share on other sites More sharing options...
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