Generally re 1M fluids (engine, transmission, differential): see the 1M fluids sticky:
General BMW info regarding engine oil
for the 128i/135i and 1M.
More particularly pages 217-219 of the "BMW 128i/135i Owner's Manual 2012"
(USA) (which was supplied with the 1M, together with the "BMW 1M Supplementary Owner's Manual"
For the complete manual (as well as other manuals and basic info): see the "BMW 1M Manual | Catalogue | Presskit | Pricelist" sticky (http://www.1addicts.com/forums/showp...82&postcount=1