I think there was a conversation about this and from what I found the "consumer" version (presumably what KTM gets supplied in bulk) is Motorex Racing Fork Oil 4W

Referring to comparison charts the viscosity is 16 cSt @ 40c

So you have a large variety of similar options, or could put this in, 15 quid for a liter.

I recently ran into this issue when rebuilding some automotive racing Öhlins shocks, the cunts didn't wanna tell me the viscosity but fortunately the rebuild kit came with the right oil, good thing too because from what I read online it was either Öhlins No 2.5 (11 cSt) or Öhlins No.5 (22 cSt) which is a huge fucking difference lol...

 

I'm trying to get WP to let me have the data sheet for the oem oil..... watch this space!
Yes, a very good chance that the Motorex 4W could be the stuff but if not I could be faced with having to remove the forks again and try something else.
Trial and error is what I'm trying to avoid.

 

I'm trying to get WP to let me have the data sheet for the oem oil..... watch this space!
Yes, a very good chance that the Motorex 4W could be the stuff but if not I could be faced with having to remove the forks again and try something else.
Trial and error is what I'm trying to avoid.

Let us know if you find anything but I'm 90% sure the motorex stuff is right.

 

 

It could be just me, but I immediately thought…

 

Classic! .........always loved The Two Ronnies, still brilliant god knows how years on.

 

We understand that you are looking for a data sheet however this isn’t something we can supply to you. We can confirm the recommended oil is SAE 4 weight and would kindly reiterate that WP Suspension UK have approved 48601166S1 - FRONT FORK FLUID SAE 4 5L. There may be aftermarket solutions available, however, we cannot comment or recommend those as they are not manufactured or tested by us.

We trust this information helps and Should there be anything else we can help you with in the future, then please reach us via the contact section on the website.

Kind regards,
Louise
www.wp-suspension.com

No reason they can't supply the data sheet, just that they WON'T

 

Ahahahaha as expected 😂

Cunts... I'd just bite the bullet on Motorex 4W

My email to Öhlins:


"Good evening,

Thank you for that, I'll call them tomorrow.
Would you be able tell me what is the actual oil specification for reference?

Thank you!

Kind regards,"

The response (and i shit you not this is unedited):

"Morning
Sorry not

Best Regards"

 

I've put stronger ktech springs in with 5w oil and stronger rear spring all works great I'm 105 kg

 

Which 5W?

For suspension fluid the "W" number might as well be saying "the yellow one"

 

Motul

 

And which version?

Factory Line or Expert?

 

Expert

 

Cheers, so that's then 18.9 cSt which is about 18% heavier than Motorex Racing Fork Oil 4W

Which makes sense it works with the heavier springs.

 

Oh nice one thanks, had to look up what cst was then, I just guessed a little bit thicker should bo OK with more boing, got the superduked +10mm link plates and it's great , just set the settings to track on the info on the manual for a trackday and the normal road settings for playing in North wales

 

Ktech are really helpful and sell there oils worth ringing them

 

Just finished servicing my 1290s forks. I brought a litre of 2.5w and a litre of 5w Expert level Motul. i put 500mls of 5W in each leg, plus 110 mls of 2.5W this got me close to KTMs Motorex 4W.

 

Do the legs not run with different volumes either side Dave ?

 

No, not on the 2020 Gen 3 1290 with non electronic forks. The GT 1290 dose have differing volumes tho. 615mls is the correct volume per leg. or 110mm air gap.

 

Good to know, thanks