Which oil do you use in your truck 5w30 or 10w30?

The owner's manual should have that information. For most vehicles in most climates, either would work fine.

Another OpinionOne important factor when selecting oil; the condition of the engine. As engines wear the space between the bearing and the crankshaft becomes larger. Thin (lower viscosity) oil leaks past the bearings too fast and the oil pump can't maintain pressure. Once the engine gets a few miles on it you need to change over to a thicker oil.

Just about every new engine will function well with either of the oils you mentioned. Select a good quality oil from a reputable manufacturer and follow the manufacturers maintenance recommendations.

I totally disagree. If the designer and manufacture of your engine lists 5w30 as the recommended weight then why would you second guess them and use another weight. It will make a difference. If it did not make a difference then the manufacture would tell you to use whatever you prefer. Use 10w30 instead of the recommended 5w30 and your engine will suffer excess wear over time. You won't see any difference now but you sure will later on down the road. So use exactly what the manufacture recommends and nothing else and you won't see the engine wear requiring you to use a heavier weight. Now, if the engine is already burning oil then yes switch to a higher weight oil. But, I assume your engine is not already worn.