- Enduro Fork Seals – using engine oil????
Been looking at getting some Enduro seals to replace the worn seals on both my Fox 36 Talas and Rock Shox Pike Dual Airs.
Whilst reading their 'How To' guides on the website they suggest using engine oil (well they call it motor oil but their American) instead of 15wt (RS) or 7wt (Fox) fork oil.
Has anyone done this?
Both forks are out of warranty so that's not an issue.Posted 9 years ago
I do remeber a thread talking about it once before…
Short answer is I dont really know..
As tinas says you can run automatic transmission fluid as its a very similar thing to fork oil as its anti foaming(but the viscocity is guesswork), not sure about how engine oils work in that application, synthetic or not.Posted 9 years ago
They suggest using fully synthetic engine oil 5/40w – which is what I run in The Beast so pinching from my stores 200ml to do the forks is easy.
The first set of forks I serviced was a set of Fox Talas 32's and I filled them with Fox's thick blue seal fluid rather than the oil – becuase I wasn't reading the instructions properly. The forks didn't work properly. Once I had swapped it out for Fox oil the forks worked fine. In fact they were alot plusher and remained so.
I think I'm going to give it ago on the Pikes as I don't 'need' them at the moment.Posted 9 years agoOnzadogMember
I read this a while back. I think it makes sense. They still use fork oil in the damper but the 30cc of sloshing oil in the bottom of the legs, they suggest using engine oil. My understanding is that it clings better to the internals ans might actually work better with the hydrodynamic bearings. Not tried it yet though.Posted 9 years ago
Re-reading the instructions they talk about putting 16cc into the bottom of each leg. And the damper unit isn't opened.
Glad I posted else things may have gone wrong when I change the travel on my Rebas!
I've got Fox 7wt oil already too.
I'll give it ago and report back.Posted 9 years agoScienceofficerMember
I've used synthetic oil for lubrication purposes in my forks since 2005.
You don't want to use it as your damping medium though. Rather too foamy and thick.
It'd be no use on open bath systems where the damping oil does the lubrication, but most forks these days separate lubrication oil and damping oil so they can reduce the overall volume of both, thus saving weight.Posted 9 years agothisisnotaspoonSubscriber
theres nothing specific about synthetic oil, its like saying you have a cabon frame, doenst specidy if it was intended to be a selvet track bike or a 12" hucking freeride monster.
Synthetic just refers to the manufacturing process where the oil is synthesised form other hydrocarbons as opposed to mineral oil which is simply a mixtrue of various crude fractions.
What the oil is used for is more down to its additives. eg gear oil has a high sulphur content and a small ammount of very very long hydrocarbons, these would lead to an almost instant emissions failiure if you ran it in an engine, but does help it survive for 100,000miles between changes in modern car and van gearboxes. Similarly fork oil will have been developed to be as slipperly as possible with the minimum of foaming and to be as newtonian as possible. Somethign stickier is probably usefull in the lowers as you want it to coat the stanchions, but not so sticky that it just clings to the inside of the lowers or actualy creates friction 9remmber gear oil doesnt have to lubricate as much).Posted 9 years ago
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