You didn't say if your cam is a flat-tappet or conventional hydraulic.  You need additional zinc during break-in on non-roller cams, then I use Mobil1 15-50 synthetic. 
Advantages of synthetics include less carbon deposits in cylinders and throughout the engine, less wear, and longer oil change intervals.  Mobil1 advantage is its wide availability at stores lite Walmart and Autozone and reasonable price, $22.88 per 5 quart jug.  Disadvantages of synthetics are the higher price and they leak more from engine seals and gasket gaps as the engines wear.  The conventional Dino-oils clog up over-clearances so you have less "sweating" and drips of oil.  Many good oils out there to choose from.  My engines usually die from breakage rather than wear!  I change it once or twice a season, whenever it looses its transparency and darkens up. My boat engine consumes oil from all the sustained hour+ runs at 4,500 rpms while bouncing in 1-3' waves.  I add a quart every 5-10 hours or so of run time.  My spark plugs never foul with Mobil1.  I have a mild Chevy Vortec 350 with a carb.  My set-up also has dual oil filters, and of course I use Mobil1 filters.  I also use mobil1 red grease on my jet pump. Happy shopping.

I've got a bahner has everything you need trailer pump and much more less motor text me 6262352886 I'll sell it cheap need it gone


Sent from my iPhone using SoCal Jet Boats