since your running a roller cam and its already broken in,
there's nothing preventing you from using either oil or a 50%/50% mix of both for that mater,
synthetics tend to be a bit more heat tolerant,
personally Id stick with the synthetic or a 50%/50% mix of both and change the oil filters at least every
6K-7.5K, miles and oil changes at least every 7-8 k
yes IM well aware the manufacturers say you can go to 10-12K between oil changes....they love selling new trucks.....
now realistically pushing oil changes to more than maybe 7000 miles is just pushing your luck,
as oil traps and circulates crud and microparticles, acids, soot, etc. that the oil filter does not always catch,
adding magnets to the oil pan and filter can help, remove and trap some of the micro crap.
swapping out the oil filter for a new one every 3K or so also helps (don't forget to add a quart of oil after swapping out the oil filter)
Some experts estimate that the wear on the rings of an internal combustion engine is as high as 0.001" per 1000 miles of operation when the oil temperature is below 170 degrees F. If the maximum allowable wear is 0.006", how long can you run your engine when the oil temperature is below 170 degrees before you wear it out?"
now the short answer is that almost any name brand of automotive 10w30 oil can be used in most modern auto engines,
but obviously some are going to be better quality than others,THINNER VISCOSITY'S WILL TEND TO FLOW FASTER , ESPECIALLY AT LOWER TEMPS. generally your better off using the quality synthetic oil of the manufacturers suggested viscosity
ID strongly suggest you read thru the thread carefully and take a few notes. most of the more modern oil formulas designed for modern engines with roller cams and catalytic converters have a good deal less ZINC and friction...
just a bit of info, I remember seeing a test on bearing wear and long term durability, where it was proven that at least on the BBC engines there was almost zero gains in long term durability once oil pressure reached 60 PSI, and almost no gains with 60 psi over what was seen at 50 psi, even at higher rpms (5000-7000 rpm under full loads) provided the volume of oil flow and bearing clearances and oil temps were reasonably close to ideal, consistently higher oil temps over about 235F are detrimental to long term bearing life,
but oil needs to exceed 215F intermittently to remove trapped moisture.
