Penrite Gearbox oil, not a great experience...

[DC2-PWR]

Hey guys,

The history of my gearbox was 5,000km's since it was rebuilt with new OEM parts. When I bought my 98spec ITR gearbox which was nearly 9months ago, I've been using the Penrite gearbox oil 75W-80.

The first day I drove it with penrite oil the 3rd gear started to crunch on high revs. 3 to 4 months later my 5th gear started to crunch. 5 to 6 months later my reverse gear got stuck, it just would not shift into reverse. Then from that day, mid revs 3rd, 4th, and 5th gear will crunch after 5,000rpm's.

So then I drained the Penrite oil and filled it up with again new penrite 75W-80 oil. Then I went for a test drive and it was still crunching 3rd, 5th, and reverse was still difficult to shift into.

Just a few weeks ago, I drained the Penrite oil and used Honda 06 MTF 75W-80 gearbox oil, and from that day there has been NO crunches in any gear, the gearbox feels like brand new!!!!!!!!! Highrevs or low revs the gears are so damn smooth. I definetly won't look back from OEM gearbox oil. I'm loving it

So I'm wondering if there is anyone else out there that has experianced the same thing I went through? Are Penrite gearbox oils bad for our Honda's? Comparing the oils is really noticable, Penrite is a darker gold color - thicker compared to OEM. OEM is a very light color - thinner compared to Penrite.

I just feel so damn happy and I wish I used the OEM gbox oil the first time.

[DC2R]

There is a big thread already covering this subject and people have expressed their experiences with various gear oils.

I use OEM gear oil and change it every 20,000km of driving. Gear box feels as good as it did when the car was brand new. (DC2R).

[cordz]

http://forum.clubitr.com.au/showthread.php?t=227

[tinkerbell]

bummer - who told you NOT to use OEM fluid?

(admittedly I use Redline Shockproof in my GB and have done for years, but that decision was made after careful research and a full gearbox rebuild - NEVER add Redline Shockproof to a gearbox that has ANY trace of other fluid in it...)

[tinkerbell]

i have updated the thread title to reflect on the thread content, so peeps stop posting links to the existing GB oil thread...

[DC2-PWR]

There is a big thread already covering this subject and people have expressed their experiences with various gear oils.

I use OEM gear oil and change it every 20,000km of driving. Gear box feels as good as it did when the car was brand new. (DC2R).

bummer - who told you NOT to use OEM fluid?

(admittedly I use Redline Shockproof in my GB and have done for years, but that decision was made after careful research and a full gearbox rebuild - NEVER add Redline Shockproof to a gearbox that has ANY trace of other fluid in it...)

Thanks boys!

I just thought that Penrite would be 10x better quality than the Honda MTF. Only reason I didn't buy the MTF because my mate said that it is the exact "same" oil as the Castrol gearbox oil... Which I had bad experiances with. But its completely different compared to the Castrol oil too.

Reading that thread, tinkerbell posted to drain the new oil out so it gets the previous oil out as well. Might do that this weekend.

[tinkerbell]

Reading that thread, tinkerbell posted to drain the new oil out so it gets the previous oil out as well. Might do that this weekend.

this kinda only applies when changing to a non-petroleum-based fluid like Shockproof - which looks like this:

[benson]

We used Nylon Full synthetic and Castrol Syntrax in most of our gearbox's

[eskimo_firefighter]

i used to use castrol syntrax in my gearbox, but after replacing it with oem fluid the shifting feels much better. However my gearbox struggles a bit at track days but its no way near as bad as the castrol syntrax.

[DC2-PWR]

this kinda only applies when changing to a non-petroleum-based fluid like Shockproof - which looks like this:

Oh sweet looks like I dont have to change mine then !

i used to use castrol syntrax in my gearbox, but after replacing it with oem fluid the shifting feels much better. However my gearbox struggles a bit at track days but its no way near as bad as the castrol syntrax.

Yeah mine didn't like the castrol either. I think the gearbox also felt hotter with castrol oil. So glad I can stick with genuine for once .

[tinkerbell]

yeah - point is - OEM MTF is GREAT fluid, but NEEDS to be changed after every hardcore trackday...

Redline Shockproof in my case lasts a whole season of racing...

suppose it is similar for BYP & Nulon?

[fatboyz39]

Nulon is a good choice for OEM LSD and OEM gearbox.

[e240]

I never liked OEM - good for a street only car.
Used it a couple of times of the circuit and always noticed alot of wear.

Honda trans need a specific weight and typically, gear oils are too heavy.
Honda trans typically need an oil similar to a 10w 30.

Street car/daily driver - honda mtf
street car/weekend warrior - honda mtf/torco mtf/amsoil mtf/pennzoil synchromesh
race car - torco mtf/amsoil mtf/pennzoil synchromesh
+ plate lsd - add ford friction modifier until the noise level becomes acceptable to you. Everyone is different. However, the more you add, the less effective your synchros are at high rpm.

http://www.ozhonda.com/forum/showthr...=1#post2716549

[trism]

the ford friction modifier is the additive they use in the LSDs in the performance models yeah?

Sent from my Galaxy Nexus using Tapatalk

[e240]

http://www.summitracing.com/parts/FMS-M-19546-A1/

However, the race guys that use our Metal LSDs here don't bother. The slipping sound isn't a major concern.