V8S -which Diff oil

V8S -which Diff oil

Author
Discussion

asteinha

Original Poster:

129 posts

208 months

Thursday 7th April 2016
quotequote all
Hello,

which Diff oil do you use for an V8S?

EP80
EP90
80W90

Which can be used?

Gruß
Toni

phillpot

17,105 posts

182 months

Thursday 7th April 2016
quotequote all

At a guess none of those, V8s should have a limited slip diff?



Don't think you'd be too far adrift with something like this..... Castrol axle Z.




Smokey Boyer

509 posts

130 months

Thursday 7th April 2016
quotequote all
Is it the GKN diff as used in the early Chimaera?

If so I have just purchased Castrol Syntrax 74/140 for mine, and it uses about 1.7L apparently (but not actually done the oil change yet)

v8s4me

7,234 posts

218 months

Thursday 7th April 2016
quotequote all
This thread is mainly about oil for the gearbox but there are a couple of posts about diff oil in it.

GreenV8S

30,149 posts

283 months

Thursday 7th April 2016
quotequote all
phillpot said:
At a guess none of those, V8s should have a limited slip diff?
Mine had a BTR Hydratrak viscous diff as standard and I assume this was how they all left the factory. It was appallingly ineffective. This type of diff is very speed sensitive and only works at high speed. Which is a shame since the time you need it most is at low speed. I think it must be aimed at people who want to be able to say they have a limited slip diff but want something that actually drives like an open diff.

When I had mine, BTR advised to use the same hypoid diff oil as proper cone diffs. I don't know whether that's still the recommended oil but I suspect it won't matter since the limited slip behaviour is going to be rubbish either way.

asteinha

Original Poster:

129 posts

208 months

Thursday 14th July 2016
quotequote all
Hello ,

could you see on the pics what kind of Diff is in my V8S ?







Gruß
Toni

phillpot

17,105 posts

182 months

Thursday 14th July 2016
quotequote all
GreenV8S said:
Mine had a BTR Hydratrak viscous diff as standard
having read up a bit I think you are absolutely correct, I'd always assumed the V8's had a "proper LSD"


That being the case, normal gear oil is all that is required, quoting from Steve Heath's book which in turn quotes from the TVR Owners handbook, recommended oil is ................ wait for it.............. API GL5 LS90



Does the "LS" stand for limited Slip ? were TVR just hedging their bets?


Edited by phillpot on Thursday 14th July 15:41

Kitchski

6,514 posts

230 months

Thursday 14th July 2016
quotequote all
It's a viscous LSD, so in theory cheapo EP80/90 or 75w90 would work, and probably work fine.

We put 75w140 LSD oil in the V8S though. Recommended by a transmission specialist, and just feels 'right' laugh

phillpot

17,105 posts

182 months

Thursday 14th July 2016
quotequote all
Kitchski said:
and just feels 'right' laugh
What, when you get it on your hands? .......... wink

asteinha

Original Poster:

129 posts

208 months

Thursday 14th July 2016
quotequote all
Thanks

viscous LSD ---> is it from Ford??

I do not found a "drain plug" on the Diff?

Gruß
Toni

phillpot

17,105 posts

182 months

Thursday 14th July 2016
quotequote all
asteinha said:
Thanks
Your welcome smile

asteinha said:
viscous LSD ---> is it from Ford??
Yes, Granada/Scorpio I think.

asteinha said:
I do not found a "drain plug" on the Diff?
filled "for life", you'll have to slacken the back cover bolts if you want to drain it. Or, if it's coming out, tip it up and maybe drain out of fill hole?

GreenV8S

30,149 posts

283 months

Thursday 14th July 2016
quotequote all
I haven't seen BTR HydraTrak diff internals first hand, but as I understand it this design uses hydrodynamic pressure to force clutch plates together, so perhaps it would still benefit from using oil designed for conventional friction LSDs. However, the advice from BTR suggested that ordinary hypoid diff oil was all it needed.

phillpot

17,105 posts

182 months

Thursday 14th July 2016
quotequote all
GreenV8S said:
I haven't seen BTR HydraTrak diff internals first hand, but.......
Neither have I but as I understand it the oil that does the "limited slip bit" is sealed within the mechanism, the oil that will drain out does nothing more than the oil in an open diff.

Kitchski

6,514 posts

230 months

Thursday 14th July 2016
quotequote all
asteinha said:
I do not found a "drain plug" on the Diff?

Gruß
Toni
The joys of blue oval engineering! Gearbox is the same.

TVRees

1,080 posts

111 months

Thursday 14th July 2016
quotequote all
Anyone ever fitted drain plugs to these ?
Since I have the gearbox and diff out at the moment, I might be interested in trying idea