Shawn,
I met someone who had put one weight grade higher oil into his diesel which
caused some kind of sensor to trip out; he thought he was going to have to
pull his engine until he put the proper weight oil in, at which point everything
went back to normal.
So it's worth trying 30w oil. You'd have to go through 1 or 2 oil changes
to get most of the heavier oil out, so it's an experiment you'd be doing
over a bit of time I'd think.
-jonathan
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