Quote:
Originally Posted by chinny4290
I always thought M103s/m104s liked thicker oil. My cert. Mbz mech always used 15W40, and then I tried out 10W40 for a while and just got better fuel economy. It ran slightly smoother though with the 15.
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They do love the thicker oil, have used 20W50 (since there are no freezing problems here in the tropic) and the M104 loves it. Runs smoother, quieter and more (apparently) more efficient.