Penrite Gearbox oil, not a great experience...

[EG30]

Been using the Penrite SIN gear oil 75W90 in my eg's dc2 ITR box with Kazz LSD.

No issue with gear crunch and holding up to mostly trackwork mileage. Fully synthetic composition withstands high temps of close to 300F/150C oem fluids can only dream of. Compatible with brass synchros ie doesnt attack them like some GL5 fluids. Penrite sells friction modifer seperate also but since the built in amount feels plenty good to me I dont intend to add more as too much will degrade rubber seals and reduce lsd performance.

Feels very much like Castrol Syntrans in terms of shift feel.

For shifting, oem or 75W80 grade WITHOUT friction modifer always best as sychros rely on friction to work. But with plate type LSD installed, using trans fluid without friction modifer MAY be too harsh.

If you had only oe torsen LSD and car isnt track often oe fluid is great and priced very well. If you want high temp stability for freq trackwork in high amb temps then there are plenty of good synthetic trans fluid without friction modifier added such as the Amsoil man synchromesh fluid.

2.5L of Penrite cost me $55, enough to do our boxes with 0.3L or so leftover.

Using Motul or Redline need to buy 3 bottles initially.

Been told the Motul LSD FF type II oil is the bees knees for my app, and I would like to try that for sure in the future when budget allows. But so far the Penrite shifts fine and when drained after many events it's still clean and clear without any signs of overheating.



Penrite had since changed the labelling and name slightly as they often do. The "SIN' logo that came out only couple of years back they spent $$$ marketing is now gone ( They made the SIN engine oil range obsolete too and replaced with the 10 tenths range ) and "fully synthetic" bottom banner is gone also even though it's the same product inside. That most certainly won't impress those who worship Caltex mineral 10w30 oil with Honda Aust FEO labelling.

http://www.penriteoil.com.au/product...in_gear_oil_75

[EG30]

Just changed the trans fluid in our dc2r from Honda MTF to Amsoil 5W30.

shift action from cold more slick and feels very much like Redline MTL, once warmed up feels the same as Honda MTF in terms of shift feel.

Most importantly this fluid has stopped the 2nd>1st gear crunch we always had in this car. The 1st/2nd gear sync sleeve is definately pretty flogged and replacement is the only real long term fix but with this fluid our tranny can soldier on bit longer yet before a strip down.

[DC2-PWR]

5W-30? Thats like engine oil weights

Any more information on regarding that? Is it safe?

So what oil would you highly reccomend from your experiance? Redline?

Thanks very much for the detailed information, much apprciated.

[EG30]

5W-30? Thats like engine oil weights

Any more information on regarding that? Is it safe?

So what oil would you highly reccomend from your experiance? Redline?

Thanks very much for the detailed information, much apprciated.

Yes 5w30

Honda MTF is a 75w80 trans fluid which equates to a 10w30 motor oil in terms of viscosity. The SAE grading system has diff set of numbers for motor oils and trans/gear oils. In Amsoil's case they've decided to grade the vis in the motor oil 5w30 grade instead of 70W80 nonmenclature.

So it's a tad thinner than honda spec oe mtf when cold and once warmed up it's the same vis with the additional benefit of being a premium synthetic oil manufactured by the one of the pioneers of true synthetic oil for the mass market back in the early 70s in USA. It's compatible with brass synchros in our boxes and very popular with GM trannys in the states ie Amsoil oe for GM to use in their problematic trannies with synchro issues.

I tried Redline MTL in my eg when it had the ZC engine/tranny in it and car wasnt driven hard or track much at all and I had no problem with the tranny before or after I used redline MTL in it.

But I wont try redline tranny oil because....

I know of too many instances people at the track who races with tranny failures with them; Whether or not it's due to abuse or tranny on its way out anyway I cant be certain. Some of those guys I know of insist since they switched to another syn tranny fluid from say Castrol they never had a problem or tranny lasts a few seasons before requiring a rebuilt.

Hence I wont take the chance, no doubt their motor oils are great and I havent heard them being a let down but somehow it's a different story with their tranny oils. Esp the price of Amsoil MTF is barely more $$$ than Castrol Syntrans the decision is easy, the equiv grade ie Redline MTL is a lot more even dependability comes into the equation.

[gunpoons]

5W-30? Thats like engine oil weights

Any more information on regarding that? Is it safe?

So what oil would you highly reccomend from your experiance? Redline?

Thanks very much for the detailed information, much apprciated.

yeah as eg30 said,
i did alot of research on the net and crsx before making a bulk buy and amsoil mtf and engine oils are held in very high regard

[EG30]

Bulk Buy is the word alright gunpoons.

I was lucky enough a fren who is fanatical with thin oil uses Amsoil signature series 0W20 in his EK9 and I just tag along with a few bottles with his biulk order from the Aus distributor in the East.

Availability is important to me and I dont have the spare $ to buy up $500-1000 of fluids to store hence I mostly stick to mainstream brands I can buy as needed from auto stores.

[james61859]

Had the exact same problem when i got it serviced they put penrite gearbox oil in and after that i noticed gear crunches in the high revs. So i drained it and put in honda mtf and it fixed the problem straight away