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Re: weight of oil
I can think of two reasons to put 20W-50 in your late model:
A. You live in Death Valley
B. Your oil pump is weak
At such low mileage the original 10W-30 recommendation should be plenty, but if your truck has had a hard life with little maintenance, your bearing and ring clearances could be opening up.
If your oil pressure is dropping, try replacing one quart of oil at your next change with Lucas Oil Supplement. It works for me, but my trucks don't need it before 250,000 miles.
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