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Originally Posted by Potroast
yes, but on the endurance, assuming your ambient is within spec of a 30w oil, you should run that. If you feel you will be stressing the temperatures above the capacity of a 30w, you could run a 40w. A 50w is extremely heavy, and unless you have the temperatures and conditions high enough to warrant it, you'll be wearing your parts unnecessarily.
That's why it has been asked several times for oil analysis -- that will tell us for sure whether the 50w was the better choice, or if he should switch to something thinner.
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I run from sea level to 8600ft and on any given trip I might start out at
freezing or below and end up in Death Valley at 104F in October going
up 5 mile 10 to 15 % grades on bad rock roads so I run 5w 50 synthetic
and have for years. Truck is very heavily loaded also. I can't change oil
in the middle of a trip so for me a broad spectrum multigrade synthetic
oil makes sense.
Zardoz