KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 1 minute ago, SpitFire6 said: Hi, You are correct. brass is a yellow metal. I must admit I never read before posting. It does not change that today "The thing about GL5 oils attacking yellow metals is based on out of date information.". The data you posted is out of date. Cheers, Iain. Did you also fail to spot that it was revised in June 2020 to contain up to date information. Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 25, 2022 Report Share Posted June 25, 2022 21 minutes ago, KevinR said: The last time I checked, brass is a yellow metal, Is it Mimosa?!! Most excellent! Just drive it dude. Doug Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 Iain, If you want to use GL5 oil, then that is your prerogative, and your risk. Many others, myself included, will stick with GL4 oil as its readily available, similarly priced, and has a long track history of being suitable for our cars. 2 Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 3 minutes ago, dougbgt6 said: Is it Mimosa?!! Excellent! Just drive it dude. Doug Doug, I think the colour is a bit closer to Saffron than Mimosa - unless its been exposed to too much of the one of the problem GL5 compositions, in which case it could be black. 1 Link to comment Share on other sites More sharing options...
Graham C Posted June 25, 2022 Report Share Posted June 25, 2022 I agree. Iain your chose and your risk. Use GL 5 and is know what happens. Graham Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 25, 2022 Report Share Posted June 25, 2022 7 minutes ago, KevinR said: I think the colour is a bit closer to Saffron than Mimosa Andy Cook's car is Saffron, he may be the GT6 registrar, but his car's not as pretty as mine. (see below) Doug Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 Amsoil did some research and testing of GL5 oils back in 2007 (ok, that's a few years ago, but not that long ago) and found several oils that corroded yellow metals. http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf It wasn't a study of every GL5 oil on the market, and focussed on those available in the USA rather than the UK, but personally I would want to see the results of the same set of tests performed on any GL5 oil that someone was trying to persuade me to put in my Triumph gearbox or differential. Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 4 minutes ago, dougbgt6 said: Andy Cook's car is Saffron, he may be the GT6 registrar, but his car's not as pretty as mine. (see below) Doug Andy Cook's car is a rather odd shade of Saffron - its more a cross between Saffron and Mimosa - It's a lot yellower than an original Triumph Saffron paint job. Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 31 minutes ago, KevinR said: Did you also fail to spot that it was revised in June 2020 to contain up to date information. I saw it said June 2020. Good we are discussing it & not deleting posts. Note that in a gearbox the GL5 must be suitable for synchromesh gearboxes. GL5 is not a problem in a diff. Cheers, Iain. Link to comment Share on other sites More sharing options...
Chris A Posted June 25, 2022 Report Share Posted June 25, 2022 2 minutes ago, SpitFire6 said: Note that in a gearbox the GL5 must be suitable for synchromesh gearboxes. GL5 is not a problem in a diff. Cheers, Iain. Well, there is no way I'm going to have a stock of each when one will do both jobs. Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 25, 2022 Report Share Posted June 25, 2022 15 minutes ago, KevinR said: Andy Cook's car is a rather odd shade of Saffron I' tell him you said that. Doug Link to comment Share on other sites More sharing options...
johny Posted June 26, 2022 Report Share Posted June 26, 2022 8 hours ago, SpitFire6 said: Note that in a gearbox the GL5 must be suitable for synchromesh gearboxes. GL5 is not a problem in a diff. Cheers, Iain. How can all GL5s be ok for the diff when theres yellow metal in it like the gearboxes? We're getting to a logical conclusion but its painfully slow😄 Link to comment Share on other sites More sharing options...
Clive Posted June 26, 2022 Report Share Posted June 26, 2022 18 minutes ago, johny said: How can all GL5s be ok for the diff when theres yellow metal in it like the gearboxes? We're getting to a logical conclusion but its painfully slow😄 Simple. GL5 does not automatically mean it will attack yellow metals. Many (most?? all??) are yellow metal safe. The gearbox thing is down to synchromesh rather. I keep things simple. Triumphs I use 80/90 GL4 for box and diff. Have done for 30 years. T9 box I use semi synthetic 75-90 GL4 (as per the company who builds the best T9 boxes recommends) Subaru diff I am using a Redline Heavy GL5 oil. Seems to like it! Link to comment Share on other sites More sharing options...
johny Posted June 26, 2022 Report Share Posted June 26, 2022 So I think we can finally put the subject to bed and the advice stands: if youre going to use a GL5 for yellow metals confirm that that particular one is recommended for them🙌 Link to comment Share on other sites More sharing options...
Clive Posted June 26, 2022 Report Share Posted June 26, 2022 36 minutes ago, johny said: So I think we can finally put the subject to bed and the advice stands: if youre going to use a GL5 for yellow metals confirm that that particular one is recommended for them🙌 for the diff, yes. For the gearbox, you need to check it is ok for synchomesh gearboxes. Simple solution is to use GL4 which works perfectly well. I could muddy the waters by saying GL4 is no guarantee taht an oil is yellow metal safe...... but I expect all are now. Maybe avoid the cheap/unknown brands, but that applies to all oils. Link to comment Share on other sites More sharing options...
johny Posted June 26, 2022 Report Share Posted June 26, 2022 Yes I think what made some GL5 a problem was the concentration of additives needed to meet the spec whereas GL4 never required that level so was inherently safer with yellow metals.... Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted June 26, 2022 Report Share Posted June 26, 2022 Debate regarding the GL4 /5 seem to focus on the issue of whether or not GL5 , in this particular application, could be disadvantageous ? To make my decision, I turned the question around, asking instead: “In this situation, is there evidence that using GL5 is advantageous ?” The answer seemed to be “No” …Therefore I chose GL4. 3 Link to comment Share on other sites More sharing options...
Badwolf Posted June 26, 2022 Report Share Posted June 26, 2022 Thankfully, sanity appears to have returned to the thread. Link to comment Share on other sites More sharing options...
Chris A Posted June 26, 2022 Report Share Posted June 26, 2022 4 minutes ago, Badwolf said: Thankfully, sanity appears to have returned to the thread. In that case I'll move on to one where it hasn't . . Link to comment Share on other sites More sharing options...
johny Posted June 26, 2022 Report Share Posted June 26, 2022 22 minutes ago, Unkel Kunkel said: Debate regarding the GL4 /5 seem to focus on the issue of whether or not GL5 , in this particular application, could be disadvantageous ? To make my decision, I turned the question around, asking instead: “In this situation, is there evidence that using GL5 is advantageous ?” The answer seemed to be “No” …Therefore I chose GL4. I think youre probably right but for racing applications or a serious increase in HP/torque the appropriate GL5 might offer help in prolonging the life of some parts in the drive train... Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted June 26, 2022 Report Share Posted June 26, 2022 6 minutes ago, johny said: I think youre probably right but for racing applications or a serious increase in HP/torque the appropriate GL5 might offer help in prolonging the life of some parts in the drive train... My decision was appropriate for the needs of the vehicle and its intended use. I don’t intend trying to increase the power of engine; There is not even a remote prospect of me going racing! Link to comment Share on other sites More sharing options...
Chris A Posted June 26, 2022 Report Share Posted June 26, 2022 28 minutes ago, Unkel Kunkel said: There is not even a remote prospect of me going racing! The only racing I do is to the toilet when I have a stomach bug! Link to comment Share on other sites More sharing options...
daverclasper Posted June 26, 2022 Report Share Posted June 26, 2022 3 hours ago, Chris A said: The only racing I do is to the toilet when I have a stomach bug! Your doing well. I do find myself getting caught on the hop. Especially near a loo or home when it comes on massive for some phycological reason. Key fumbling in the front door, undoing my pants going up the stairs, still don't always quite make it. Apologies for too much information (though maybe better than being anal?) Link to comment Share on other sites More sharing options...
johny Posted June 26, 2022 Report Share Posted June 26, 2022 one of the few posts thats better WITHOUT photos Dave😮 1 Link to comment Share on other sites More sharing options...
PeteH Posted June 29, 2022 Report Share Posted June 29, 2022 On 26/06/2022 at 18:27, johny said: one of the few posts thats better WITHOUT photos Dave😮 Even then not pretty!. Pete Link to comment Share on other sites More sharing options...
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