T5 Gearbox

[Transmitter Man]

Can someone please tell me what is the correct / best oil for a freshly rebuilt T5 gearbox?

Thanks.

Phil

[turbopug]

Some information here,

http://www.pistonheads.com/gassing/topic.asp?t=986...

[macdeb]

Still confused So what IS the best gearbox oil to use in a T5?

[Transmitter Man]

Reading all the above posts and then checking out said product descriptions both the Redline MTL and Castrol SMX-S are both synthetic and have pretty much the same viscosity 70W80 & 75/85 respectively while the Royal Purple is also synth but has a viscosity of 10W30.

Pricing seems similar +/- a few quid.

I'm inclined to go for the Redline or Castrol but what further thoughts re the differing viscosity numbers?

Phil

[DrDeAtH]

T5 box should be Dexron II fluid.

[Transmitter Man]

Doc,

Did you follow the PH thread link above in Turbopug's post?

Phil

[rev-erend]

So - have you converted to a T5 ?

What did you do with the speedo drive ?

[Transmitter Man]

Hi Al,

I'm converting my De Tomaso from auto to a the T5 stick shift. The SEAC can make do with the LT77.

I imported a 'built' one from the US that can handle the grunt, read that as torque.

Phil

[plushuit]

DrDeAtH said:

T5 box should be Dexron II fluid.

Well done! ALL World Class T-5 use ATF oil and NOT a big heavy gear oil or Redline MTL! The NON-World Class T-5s use 70 wt gear oil.

That being said, Castrol SMX-S shouldn't kill it and might even improve it. It is made for manuals that require thinner fluid. Never tried it though.

[fatjon]

ATF not stodgy gear oil. Been belting over 400hp through mine for years without trouble.

[DrDeAtH]

Have a world class T5 in mine. have not followed other thread....

[TVR_owner]

Speak to Jon Reid at Readman Racing.

You will need to know the spec of the box before anyone can correctly advise on oil.

[Transmitter Man]

TTC who own Tremec who purchased Borg Warner just got back to me with;

The WC T-5 takes 5.63 pints of Mobile 1 Synthetic ATF.

However, I decided this morning to purchase the Castrol SMX-S but Halfrauds only had two litres so looks like I'll need another litre.

Phil