GL-4 vs GL-5 Gear Oil in Transmission.

[SurferD]

Great, I just put in Lucas in both my Z and WRX!

They scored worst in almost all categories.

[Chickenman]

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.

[Zed Head]

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?

[EuroDat]

57 minutes ago, 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.

[SurferD]

4 hours ago, 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, 2016 by SurferD

[Chickenman]

4 hours ago, SurferD said:

6 hours ago, 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, 2016 by Chickenman

[Chickenman]

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/

 

 

[Chickenman]

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

 

[Consigli]

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. 

[SurferD]

20 hours ago, 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.

 

 

 

[Consigli]

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!

[Chickenman]

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...