Paul H Posted February 27, 2017 Report Share Posted February 27, 2017 I read in Practical Classics this month that EP90 GL5 wasnt suitable for our classics . Not ever hearing about GL4 or GL5 mild panic ensued as I checked the label on the tin of Castrol EP90 . There was no mention of either so rang the help line and was advised that Castrol EP90 oil in their green tin was GL4 - Panic over Paul Link to comment Share on other sites More sharing options...
AidanT Posted February 27, 2017 Report Share Posted February 27, 2017 Read your first sentence AAGHHH. got to the end PHEWW! Thanks Aidan Link to comment Share on other sites More sharing options...
dave.vitesse Posted February 27, 2017 Report Share Posted February 27, 2017 GT5 does nasty things to the washers in the Diff. Dave Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 27, 2017 Report Share Posted February 27, 2017 blimey this old nutshell continues to raise its head more times than what oil for dashpots ( sae20 or base 20/50) there are some GL5 that are yellow metal tolerant but if unsure dont use it where as all GL4 is yellow metal tolerant , the adatives in most GL5 can disolve bronze/brass. copper metals if used in arduous working and very hot places so things like baulk rings and thrust washers can suffer the diff has a harder life with oils than the gearbox and gets very hot due to efficiency losses so planet thrusts may thin down. i know from years of experience with truck reliability when one of our name changes involved a change of oil supplier and GL5 was introduced without prior concern and our older diff designs suffered thrust failures in volume ...nightmare , dont take the chance unless you have a specific GL5 oil spec thats compatible with hot yellows . Pete Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 Bump. Pete, now this it not true about GL5 eating yellow metals. Please confirm. Cheers, Iain. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 25, 2022 Report Share Posted June 25, 2022 Well, a lot can change in 5 years... Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 21 minutes ago, Colin Lindsay said: Well, a lot can change in 5 years... More like 20. Link to comment Share on other sites More sharing options...
johny Posted June 25, 2022 Report Share Posted June 25, 2022 Still seems like sensible advice doesnt it though? Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 2 minutes ago, johny said: Still seems like sensible advice doesnt it though? What advice is that? Link to comment Share on other sites More sharing options...
johny Posted June 25, 2022 Report Share Posted June 25, 2022 What Pete said in 2017? Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 No it is not today. Hence my Bump. GL5 & yellow metals is a Myth. Link to comment Share on other sites More sharing options...
Chris A Posted June 25, 2022 Report Share Posted June 25, 2022 Why take the chance? Use GL4. Link to comment Share on other sites More sharing options...
johny Posted June 25, 2022 Report Share Posted June 25, 2022 Still plenty of stuff online that explains the issue so I think the advice stands. Its only sensible.... Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 Just now, Chris A said: Why take the chance? Use GL4. Take the chance with what? Today, GL5 does not attack yellow metals. (Despite what TSSC says!). Ask any reputable supplier of oil. Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 Just now, johny said: Still plenty of stuff online that explains the issue so I think the advice stands. Its only sensible.... It's out of date stuff. if it's online it's true. LOL Link to comment Share on other sites More sharing options...
johny Posted June 25, 2022 Report Share Posted June 25, 2022 Why take the risk, not all stuff online is lies LOL Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 (edited) "The thing about GL5 oils attacking yellow metals is based on out of date information." Opie Oils <sales@opieoils.co.uk> Ask them as they sell oil. Edited June 25, 2022 by SpitFire6 speeling Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 https://www.widman.biz/uploads/Transaxle_oil.pdf makes an interesting read, and its been kept up to date. I'm sticking with GL4. Link to comment Share on other sites More sharing options...
Badwolf Posted June 25, 2022 Report Share Posted June 25, 2022 33 minutes ago, Chris A said: Why take the chance? Use GL4. Agreed 26 minutes ago, johny said: Why take the risk, not all stuff online is lies LOL Agreed Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 Luddites walk amongst us. it's all a free choice but TSSC should stop saying that GL5 is a problem concerning yellow metals when it is not. Hi Badwolf. How are you doing? Cheers, Iain. Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 26 minutes ago, KevinR said: https://www.widman.biz/uploads/Transaxle_oil.pdf makes an interesting read, and its been kept up to date. I'm sticking with GL4. Hi KevinR, Where does this post relate to yellow metals? Cheers, Iain. Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2022 Report Share Posted June 25, 2022 31 minutes ago, KevinR said: https://www.widman.biz/uploads/Transaxle_oil.pdf makes an interesting read, and its been kept up to date. I'm sticking with GL4. 3 minutes ago, SpitFire6 said: Hi KevinR, Where does this post relate to yellow metals? Cheers, Iain. The last time I checked, brass is a yellow metal, unless you can prove otherwise, and yes, the article talks extensively about the damage mechanism to brass synchronisers by the use of GL5 spec oils in a gearbox. Link to comment Share on other sites More sharing options...
johny Posted June 25, 2022 Report Share Posted June 25, 2022 58 minutes ago, johny said: Why take the risk, not all stuff online is lies LOL What I read in more than one place and sounds reasonable is that to achieve GL5 spec higher levels of a range of possible additives are needed than GL4 and some of these can damage yellow metals. Obviously in applications where theres no yellow metals the higher risk additives (which it said tend to be cheaper) can be used with no problem and theres no need to look for anything different. However for use with yellow metal the GL5 lube has to be made with the safe additives which the labelling should confirm and correspondingly the price may be greater.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 25, 2022 Report Share Posted June 25, 2022 i dont get why you would use a gl5 when gl4 is readily available we cant replicate the testing done by triumph use whats specified and it does what it should change it because you can gives you the risk to enjoy modern car synchro rings are often a iron based so they dont matter pete Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2022 Report Share Posted June 25, 2022 8 minutes ago, KevinR said: The last time I checked, brass is a yellow metal, unless you can prove otherwise, and yes, the article talks extensively about the damage mechanism to brass synchronisers by the use of GL5 spec oils in a gearbox. 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. Link to comment Share on other sites More sharing options...
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