Quote:
Originally Posted by Stu
I bought a job lot of 10wt & 20wt oil from a manufacturer of MTB shocks.
I mixed it together to make 30wt.
It seems OK, maybe a little thinner than normal 30wt, but it was cheap and I have 7 litres of it.

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I would have thought that this would make 15wt.
(10+20)/2=15. No idea if oils follow maths