Need help with oil options

Depends on what you want, IMO. I use all synthetic (Mobil 1) not blends.

You should never break in with any synthetic, full or blend; the rings may not seat with that. Just use a good quality petroleum oil. (I like Castrol GTX.) I also don't put any additives in during break in for the same reason; the only thing that goes in besides new petroluem based oil is the can lube.

The reason that I use all synthetic is both from my endurance type racing (rally) experience and also experiences in stock engines on the street.

On street engines, the wear that I have seen on a total of 4 mopar engines (slant 6 and 3.5L V6 and 2 small blocks) has been incredibly low; each engine that I have run on Mobile 1 from nearly new has reached 250k miles and more; I don't know how long they would go because they get sold and I never see the real end of life. Rockers and hydraulic lash adjusters have been all replaced at 200k miles on these engines and they run like brand new motors after that.

On the rally engines, which commonly see 100-150 hard turbocharged miles in an event + cruise miles, the level of oil breakdown is dramatically less for the full synthetic vs a non-synthetic. Non-synthetic oils will be solid black after this hard use, but synthetic will be a light translicent brown.

I have also had oil system failures and one race incident was dramatic: I started losing oil pressure after 2 miles after the leak started, and I had ZERO oil pressure after 4 miles and said "What the hell" and raced the final 2 miles with NO oil pressure, with a little feathering of the throttle. The engine ran perfectly on the Mobil 1 synthetic throughout and after I refilled. I tore down the motor, and I swear to god, the bearings, cam surfaces and bearings, cylinders, and oil pump did not have a scratch on them. This is on an engine that runs around 60-70 peak HP per piston so is not a low internal load engine.

I can't think of better reasons to run full sysnthetic. For some apps, oil is oil is oil but not in my experience in street engines and in my racing apps.