355 Amsoil... API GL-4 or Gl-5 Oil For Gearbox Oil?

That is a pretty good piece. Lots more out there too. As I said before, Ferrari uses small differential gears for the power they have. It means a GL5 is needed in the hypoid cars.

 

Appreciate your response. I’ve been using the Redline 75w90 NS for 8 years in my CS. No idea what the inside of the box looks like at 10k miles. I want to do what’s right for the car, but if it fails I’ll get out the wallet and hope for the best.

 

That article states to use what the manufacturer recommends. For whatever it’s worth, the 355 challenge bible states to use Shell Spirax (GL5).

 

For this GL-5 oil, Motul state that it is also for transaxles and "Suitable for any type of seal and any type of material used in gearbox and limited slip differential design." Being a reputable company, I don't think Motul would make any incorrect statements. Perhaps a good oil for 348/355?
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But why Motul over the Spirax if it’s almost the same?

 

Yes, Shell Spirax S5 appears to be also good for transaxles. About the only "extra" that Motul Gear 300 LS has is the statement "...and any type of material used in gearbox..." which, I guess, covers the brass synchro rings.

 

Just checked the Motul's "Oil Selector" and Shell's "Find the Right Oil". Motul recommends their 300 LS 75W-90 for both, 348 and 355. Shell, however, recommends their Spirax S5 ATE 75W-90 for the 348 and does not show any recommendation for the 355.

 

Fyi

Ravenol vsg has a copper strip test of 1a which is the same as redline mt90 ..

Redline NS is 1B ....




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And 100 years from now that copper test strip will still be perfect. That test has no relevance to the type of damage being discussed.

 

@flash32 do you have an endorsement deal with Ravenol?

 

Seems like a recommendation for Ravenol based on assumptions and literature. Not even experience. It may be great but there is no first hand evidence of it working any better, or at all. Look.. Lucas products like oil treatments say how great they are but many tests on bitog showed all they do is froth the oil and reduce oils bailey to actually lubricate. Most of Lucas products are pure snake oil but the labels say otherwise. Not sure it's advisable to recommend because a manufacturer says so is all.

I tried Spirax and made the car a joy. Would I try MT90, sure maybe next oil change to see first hand. is MT90 better for the GB, Brian says yes so I am inclined to believe that, he has seen it all and has first hand knowledge inside the GB.

 

Spirax is a good product. I do not use it because the US importer has so little interest in selling it.

 

Yes it is difficult to find, no disagreement there. I did find this place that sells it in 5 gallon pales in NY and they do ship. Being in NJ shipping was not horrible for me. Just adding to conversation, I am not advocating it the best solution or it will work for all cars or anything remotely like that. It is the only US distributor I found but may be others somewhere. Redline (love their products) is available everywhere. Probably cheaper as well.
https://avepetroleum.com/product/show/shell_spirax_s5_ate_75w90_1*5_gallon_pail

 

@Ferrarium as i mentioned above i have at least half a dozen people on here that have used it after i suggested it and each liked it .. of course we won't know for sure until we have 50k on these cars ..but don't say "experience" ..i used Eni rotra lsx but next time will use Ravenol just cause it easier to get

Yes the research was done with literature from the manufacturer information from the manufacturer and tech specs from the manufacturer as well as like I mentioned above a few people using it

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No .. absolutely no affiliation it is just that after I research / try something I just like to share my knowledge / experience ( isn't that what this forum is about ) but it doesn't seem like anybody wants to hear it so I will stop sharing on this thread

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The test as you know test what the chemical composition of the oil does to copper which brass is made of .. usually the sulfur content degrades cooper and brass.. there are articles in this but i don't have the time to go back and look

The test at least shows that a mt90 and this oil affect copper the same where other gear oils degrade the metal more...1a vs 1b etc

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@Rifledriver

I know this is probably hard and almost impossible to answer ..but was there a specific oil that you saw caused the synchro damage besides a broad statement of gl5. Every manufacturer uses a different cocktail to get a gl5 approval so i still stand behind that Eni rotra lsx and Ravenol vsg have a chemical makeup that isn't as corrosive as some other Gl -5 gear oils

I know Ferrari also recommends tf1055 which I cannot get much info ..i did virgin oil analysis on it but not much i got from it

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Ok so you say spirax is a good product ..how do you justify that endorsement.. what research have you done ?

Respectfully..how is it that you can make a statement like that but debate me in Ravenol

Remember the cars you are fixing have factory fill and/or dealer serviced with spirax and still fail

The only reason Ferrari uses it is because it was in bed with shell ..i think you even said that in past on some fluid they use

I spent many more hours researching oils .. if you tell me you see something in the cars that you take apart that can substantiate that that is a good product..then i will be silent




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