14-11-13, 04:03 PM
(14-11-13, 01:44 PM)Motorbreath link Wrote: There is nothing brainless of using a SG or SJ oil despite it is synth or not, in a bike designed for SE(1971) like ours. Even the 2012 R1 works on SG(1987).
That's not the reason you stated. You said your mechanic thinks that mineral oils are the only type 'thick' enough to fill the gaps in 'huge tolerances', which is silly nonsense.
Mineral oils are only usually reccomended for running in new engines when tolerances are <cough> tight, this is because the metals have a 'rough' (for want of better word) surface texture from the machining process, the lower protection of mineral oil allows the surface to wear to size, although this process is largely not needed because of better machining methods.