Yep mineral oil it is, a cheaper option rather than purchasing the OEM BMW oil is to go to your local motor shop and get the same fluid that is used for the hydraulics in Citroen cars. Exactly the same stuff, just branded differently.
I would bring your bike back to the dealer and tell him that you are not happy with the end result and in fact get him to test ride it from cold. A clutch change and gear oil change should not result in stiff/sticky gears at all! IF you had your transmission changed it may take some time to 'bed-in', but if anything a new clutch should be very very smooth. Just a guess, but it is possible that there is air in your clutch fluid hose?? Can cause weird and wonderful problems?? Thats the only thing I can think of to be honest..
Def get the dealer to sort it out, after all he did the work and he has to stand over it..
With relation to my own bike..... it is wrecking my head. The clutch fluid change did wonders for about 1,000 Km, then the problem returned again. I brought the bike back to my dealers (only 17,000 km) and he reckoned that it was the slave cylinder. He replaced it and it improved the problem but ut is still persistent especially when riding hard.
I am at a total loss as to why the problem is happening and can only deduce that perhaps the clutch is contaminated from leaking fluid onto the plates??? The bike is well out of warranty and the cost of breaking apart the clutch and sorting the issue is about €1,000 according to the dealer.... Might just have to bite the bullet as I will not sell on a problem bike and even though I know how to 'handle' the problem whilst riding, it takes away from the joy of riding it in the first place.....
Have'nt had any time to ride inthe past 6 months as i am recovering from Glandular fever and post op from Appendicitis (have had great luck!!).
When the weather improves I will take a closer look and get to the bottom of it...
