Like bench racing and bs, one can argue all day about
what to do and what oil to use...
Since none of us are runing ProStock, changing oil daily,
or flying, I'd rec'd reading this concise, cogent post
from "withidl", an infrequent but very knowledgeable
poster. Also, I wouldn't sweat the "mixing" and, a higher
viscosity, eg 20W-50 in a warm clime, may help that
oil burner.
GL,mD
Lube 101:
http://bimmer.roadfly.com/bmw/forums/e53/5795946-1.html
And, the unabridged version of Lube 101, right of the freakin front
page of this site. What a surprise...
http://www.xoutpost.com/articles/x5/m...ion-101-a.html