Gearbox Additive

[silverGPX]

well are u running syngear or duragear ben? cos one of them is gl5 just like the penrite sin.

[Shane001]

GL5 is not the issue, GL5 is an improvement on GL4. For example the Motul I mentioned earlier is GL5. Also suitable for non LSD.
http://www.motul.co.jp/eg/product_line_ ... ear13.html

There are several threads discussing this to death on here by the way

[silverGPX]

gl5 isnt an improvement its used in hypoid gears and for high load and corrodes yellow metals such as our synchros, thats why mitsu says to use gl4 as it doesnt contain the additives that are put in so it can withstand the high load applications thats present in gl5.

why else would they still make gl4

[Shane001]

Um, but our gearboxes use hypoid gears for the diff.

There is a lot of misunderstanding and misinformation on the web about oil 'standards'. I did a lot of research on this when I decided to go with Motul. It's not as simple as GL5 vs GL4.

[silverGPX]

my diff do u mean lsd or doesnt it matter?

[Shane001]

Doesn't matter, the drive gears on the diff are hypoid design (ie crown and pinion), and require a hypoid compatible oil. Here's an interesting thread on GL4 vs GL5. Google for lots more

http://www.bobistheoilguy.com/forums/ub ... 607&page=1

In short it comes down to the chemistry of the individual oil, more so that just the rating. The Penrite mentioned above is proven (by me) to not be suitable for our gearboxes. The Motul mentioned above has been proven (by me, and hundreds of track EVO's) to be suitable for our gearboxes Both are GL5.

[silverGPX]

hmmm okay well that makes it easier to find an oil. so i can get either gl4 or gl5. does it have to be full synthetic?

[Shane001]

hmmm okay well that makes it easier to find an oil. so i can get either gl4 or gl5.

No it doesn't

As the experience with Penrite SIN shows, GL5 oils are not necessarily going to be good for our gearboxes, by the same token if you get a GL4 oil that is not rated for Hypoid gears, you may also have problems.

It's not so much about the rating (though this is your starting point), it's more about the chemical composition of the oil (what's in it), the claimed suitability for the application, and more importantly other people's experiences with our gearboxes!

[evoman]

silverGPX - I have tried the Nuklon G70 to see if it would fix my cold start gearbox grinding and I noticed absolutely nothing at all.

Interestingly, I use the Motul FF-LSD Shane mentioned in my (LSD) box and although it is great when warm it takes about 5 mins of driving to come good. Shane doesn't appear to have this problem so I guess the condition of your box will impact whether the oil suits you as well.

[Kustom]

Mines both when Cold or warm, it's just when I shift quick-ish and at high revs, low revs I have no problems..

[storm hawk]

Castrol Syntrax 75W-90 With nolon G70 You need more than 2.2 more like 2.5 liter plus $85 for 3 liters
Changer well No unusual noises.

[silverGPX]

yep i was tossing up between syntrax nd the nulon oil. did it come in 1L bottles?

[Shane001]

Syntrax is good gear, a lot of racers use it. Not suitable for LSD though.
I'd give Castrol a ring though just to confirm suitability with Mitsi synchros.

[silverGPX]

kk well i can get a good deal from a mate on castrol syntrax.

[silverGPX]

hmmm just found out syntrax is a GL5 and syntrans is a GL4 and they say on the castrol website:

"Castrol Syntrans 75W/85 has proved to provide the best synchroniser
performance in Mitsubishi, Pajero, Galant VR4 and Lancer GSR manual
transmissions. Also effective in Holden Jackaroo and Rodeo manual
transmissions for best cold shift performance, as well as in competition
applications."

But..
then it says a bit further down

"Castrol Syntrans 75W/85 and Castrol Syntrans M are NOT
recommended for engines or hypoid differentials."

Does that mean we cant use it, or is that meaning just it cant be used in like a rear diff.

Syntrans is probably hard to find though, ill see what i can do. if i cant get it in ill have to go with the nulon though.

[storm hawk]

Syntrax 75w-90 On the back of 1lter bottle (reommended for combined manual transmission and hypoid differentials) Do not say any thing about limtered slip? Off the shelf Supercheap.

[silverGPX]

oh really?
its just id prefer a GL4 oil as syntrax is GL5, i know shane said earlier that it matters more about how the oil is made rather than its API rating but if its a GL4 oil that is full synthetic id be happy. And syntrans seems to be a good option, im just curious about the cant be used in "hypoid engines or hypoid differentials"

Did Syntrax allieviate any problems you were having stormhawk, that is if you had any?

[silverGPX]

LOL god i waffle on, i think i worry too much hahahaha.

I did a search for syntrax on the forums and it came up everywhere that people were using it so im going with that.

oh yeah and stef your car has been like that for a while check the second post..

viewtopic.php?f=21&t=3583&hilit=syntrax

also Syntrax is a GL4/5 gear oil.

/thread end
/fto australia stalking.

[Kustom]

Going into first isn't my problem man, it's shift into third mainly and it did second today..

[Bennoz]

Syntrax will be fine, just keep in mind, its no good for LSD. Mine became exceedingly lound & clunky with the Syntrax.