Very slow on the starter then see the oil pressure gauge creep slowly round. I've also detected a bit of rattle from the engine, not there immediatly, but a few seconds after starting which goes away quickly as if something had oil initially but then lost it until the effect of the oil under pressure re-filled the gap. It's not piston slap as it disappears too quickly or hydraulic lifters (99my) Possibly the cam belt tensioner? (All this at approx. 1200rpm steady throttle)
I've had my doubts about using this oil in winter.
Anyone get similar effects or any thoughts on what might be going on? 99MY - UK 24k
JohnD

10w/60 is no problem in mine during winter (down to -10 degree starts).

Richard

Just did my oil change today with Fuchs 10W60. Same manifold vacuum as before (10W40) (-500 mmHg) runs very smooth :)