Bought This.
 

I picked up this oil as it looked perfect but am still wondering if the Rotella 5w-40 synth would be better. I am in Ontario Canada so the cold months are upon us. Anyways here is what I bought. Castrol Edge with syntec 5W-50 full synthetic. It says meant for older cars , high Zinc content especially suited for older flat tappet engines. api service SN,SM,SL. TY for any help, currently has rotela dino 15-40 put that in to give it a bit of a cleaning cycle. cheers all, be safe and hope to hear from you.

I've never used the stuff personally, but I've run the rotella 15w40 in 0 degree (Fahrenheit) weather with no issue. I personally prefer to stick with what I know works, I'd guess the Castro still has a lower zinc content.

I've tried three different oils recently, in an effort to evaluate oil pressure subsequent to the oil pump replacement:

-Mobil 1 15W50 Racing Oil (synthetic)
-Kendall 20W50 GT-1 High Perf Oil (semi-synthetic)
-Shell Rotella T 15W40 (non-synthetic)

Now, I'm not in a "cold" weather environment (Central Calif.), but all seem to perform about the same wrt oil pressure and contain higher levels (1200 ppm) of ZDDP; I'm hoping the Rotella will help out with top end component cleaning.

I don't know anything about the oil you just got, but I received this info with my Turner Short block so I stick with Rotella.

In addition to the Comp Cams break-in oil referred to in the Turner doc, Lucas makes one, too, and it's readily available at most O'Reilly's Auto Parts stores.

The Amsoil break in oil is also available at most O'Reilly's. Comes down to preference I guess, that's what they recommended to me.

interesting read, i guess Turner would know

If the oil you use doesn't have zddp then just add it:
ZDDPlus | Maintain proper ZDDP levels in your engine