I changed my transmission oil...

[Brucelee]

Red Line Products are superior. Pricey too!

Thanks for the post.

[MNBoxster]

Hi,

The fluid you chose does make a difference, but a caution of just buying the most expensive.

Different Transmissions respond differently to the various Fluids available. I use Redline MT90 in the 5-speed box in my Esprit and it works better than Mobil1 or Valvoline Synth for this Citroen SM sourced tranny. Been using it for almost 10 years.

But, Redline MT90 does not work nearly as well in my '71 240Z 4-speed. The shifting is less smooth and the synchros are noisier, the best fluid for this box is the Valvoline.

There are several variations of the Boxster Tranny and you may find that different fluids work with varying degrees in each. Hope this helps...

Happy Motoring!... Jim'99

[RandallNeighbour]

This is a bit of an old thread, but I want to change my 5 speed manual transmission fluid this weekend and wondered how much I should buy. Anyone know?

[MNBoxster]

Originally Posted by RandallNeighbour

This is a bit of an old thread, but I want to change my 5 speed manual transmission fluid this weekend and wondered how much I should buy. Anyone know?

Hi,

You want 2.25L or 2.4 Qts. of Hypoid Gear Oil SAE 75W90. The manual tranny shares the fluid with the differential, so no need to change that. Synthetic is good, the Red Line is supreme. It will make the shifts crisper and smoother.

You need to fill the tranny to 11mm below the Fill Hole. The easiest way to measure this is to take a piece of wire, put a 90° bend in it and cut off the bent end to 11mm. Then, insert the wire into the fill hole to be sure that the level just touches the bottom of the wire. Hope this helps...

Happy Motoring!... Jim'99

[RandallNeighbour]

Thank you, Jim! Yoda man

[01boxster]

yay..i might just do that entire change all togwehter just like wahy t the OP did....

thanks for the advise jim!!