Fox 20wt gold is a bit thicker (98@40cST, 13.6@100cST, 137.9VI) vs Fuchs RENEP CGLP 68 (68@40cST, 8.6@100cST, 99 VI).

Since this is a coil fork, Ohlins only calls for 10 ml per leg, and it isn't winter time (have heard some people report Fox gold slipping past seals when it is cold, Manitou forks maybe).

You could always work out a mixture using the RS oil to come closer to the Ohlins spec oil if you were uneasy about it.

If it was my fork I would use what I had on-hand and adjust from there tbh.

 

I have that fork and it calls for ISO 68 slideways oil. I found some, though it's not the Fuchs brand. I have Shell Tonna S3 ISO 68 slideways oil. You might have heard of Motorex Supergliss, which is also slideways oil. Fox Gold is the equivalent ISO of Motorex Supergliss 100K or ISO 100 slideways oil. Brand doesn't really matter. They all accomplish the same function and the oil isn't under any extreme stress to pay extra for specific brands.

That being said, it's not damper oil. It's just bath oil so its main job is to lubricate the seals and bushings, not control damping characteristics. You will be fine using thicker lower leg oil like the Fox Gold if you're having trouble finding ISO 68.

 

Thanks for the replies!

I'll probably try to keep as much of the oil as I can during the travel change since it's new, and, if necessary, use the Fox Gold oil I have on hand to top it off.

I'll ride it from there and it will give me time to find some 68 slideways oil if I feel like it is necessary.

 

No problem. When I bought my fork, I went in to the rabbit hole of what lubricants I needed. Technically speaking, a more viscous oil is stickier so it'll adhere to the bushing surfaces and seals a lot easier and for a longer time. But that same viscosity could cause more stiction. However, he RXF 36 m.2 coil is so friction free that I doubt you'd notice the effects of a thicker bath oil. I used to run the air spring but I found that the ramp up chamber and main air chamber is pretty small and very, very susceptible to atmospheric changes and temperature. Pressures would be all over the place every time I'd check them. Didn't help that my garage was 75* and outside was 50* when I was tuning my fork. When I installed the coil spring, I thought my headset was loose because it's so supple and sensitive.

 

I'm pretty excited to try it out. It will be my first experience on a coil fork. I'm completely sold on coil for rear shocks, so I'm hoping that I'll be similarly stoked for this one.

I'm actually replacing an air fork (DVO Sapphire) which I did like, but with the OTT it seems to ride a bit lower and is contributing to frequent pedal strikes. It's maxed at current travel, so MTBR user @stripes provided very positive feedback on the Ohlins which helped cement my decision.

My other bike has a Fox 36 which I just really don't like (no small bump compliance). The funniest thing is that the best air fork I ever ran was on a 2008 Stumpjumper and would be considered a wet noodle compared to today's giant stanchion forks, but it ran really smooth.

Thanks again!

 

The Fox Gold will work fine at temps above freezing. We've been stocking and using Supergliss 100 and 68, and both have worked well. Often Motorex 5W40 is the choice though, since it's good all year and most around here ride into cooler temps.

 

I have just spoken to TF Tuned (UK Suspension service centre) and they sell an Ohlins service kit. They also said RS 0W30 would work.

 

Several oils would work. It's bath fluid, so as long as the wipers are good quality, you can run most anything. The 0W30 isn't a great replacement though. It's thin, so feels plush in a low speed test, but otherwise average. They prescribe the oil that they have tested and is available to them.