YBR fork oil what type ? Advice please.

[leonski]

Hello I'm replacing my fork oil and I'm not sure if I should use 10w mineral or 10w synthetic or does it not matter ??

Any advice would be great

many thanks
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[stinkwheel]

I would personally use Automatic Transmission fluid which has the same viscosity as 10wt fork oil, is a very robust fluid and is a lot cheaper than fork oil. All my bikes have ATF in the forks.

Although I have long held the suspicion that fork oil is ATF with dye in it.

I certainly wouldn't be paying a premium for "fancy" fork oil. If you check it in a month, it'll be just as manky as the stuff you drained out.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.