Oil for Hard Worked Built SBC

[Ryan00TJ]

I was gonna post this in the Boat forum but figured more answers could be had here. I was thinking about running Schaeffer's 15W-40 PAO Blend this summer but am welcome to other idea's as to what oil to use. Boat is used primarily for cruising and oil temp stays 180-195 degrees. At WOT temps rise to 210-220 degrees but never over 230 deg.

Oil Ideas?
M1 15W-50
Schaeffer 15W-40 Blend
Amsoil 15W-40 Marine

Here are some specs on the Engine....
Oil Cooler @ Powersteering Cooler
5.7L 4 bolt Main Block Bored .60 over to 360CI
Melling HiFlow Oil Pump
Lunati Forged Crank
Lunati Forged Rods
JE Forged Pistons
224/224 .480/.480 112LSA Cam
AFR 195 Aluminum Heads 2.02I 1.60E 10.2-1 Comp
Lunati 1.450" Dual Valve Springs
Edelrock Performer RPM Intake
Lunati Gold Race Forged 1.6R Roller Rockers
Lunati Custom Length Hardened Chromoly Pushrods
Holley 750 cfm Double Pumper Carb
Full MSD Ignition

Engine Dyno was 424.5 Hp @ 441.3 tq

BTW My previous motor in this boat saw many 150 HP Nitrous shots and after 10 seconds of spraying my oil temp would rise from 205-210 to 280+ and take a good half hour of cruising to drop down to normal range. Nitrous is very hard on motors and builds extreme heat as shown in the increase in oil temp in 10 secs.

 

[Shannow]

Try a 0W-20, or at most a 5W-20......

Nah, just joking.

Given boats spend a fair bit of time out of service, I reckon an Dual rated Petrol Diesel oil with a good TBN would be the go.

 

[Brett Miller]

If it was mine it would have Mobil 1 15W-50 or Amsoil 20W50 in it.

 

[KW]

Seeing that you have a hi-volume oil pump I'd look hard at the Amsoil 15W40 marine oil or something like Delvac 1 5W40.