I live in Fla where its HOT all the time & run 10-30 or 10-40 with no issues.

 

Yet. Main, rod, and camshaft bearings do not come in direct contact with their journals. If/when a bearing contacts the journal, it will knock, and eventually spin the bearing, destroying the bearing and the journal. There is a "cushion" of oil between them, and temperature doesn't matter. 10W30 & 10W40 will not physically "fit" easily enough between the bearings and the journals to provide sufficient long term lubrication to the bearings. Your engine is dying a slow death, guaranteed.

 

Doubtful at best,the engine has over 260,000 miles & still running strong.

Oil viscosity is determined by the area you live in & operate the vehicle....http://www.upmpg.com/tech_articles/motoroil_viscosity/

 

Good article, you should read it.

 

Really ?? hahahhaha

Your points are valid but not the whole story,there are a LOT more factors to concider.

 

got my popcorn...i'm ready for this...lol

 

Opinions are like ********,everybody has one.

 

Not sure if you are aware since you are still new here, but captain is basically a encyclopedia on these trucks and engines.
What he is saying is not an opinion, its from years and years of experience.

 

Doesnt impress me one bit.

 

you say that til yur truck starts doing some crazy ****...