Which engine oil to use for road/track day ?

I was recommended by my engine builder to use Memorex 0/40.

What are you using gent s as I will change engine oil soon: ie;

-Is 0/40 OK ? (always used it and is good but need refill once in a while
- Which trade mark ?

Engine. SB302.
IDA 48 Weber.
Edelbrock heads
Est 380 HP

Tx
Grtz
Fred
 
As long as it has atleast 1000PPM percentage (I prefer atleast 1600ppm) zinc or ZDDP in the oil its fine.
I must admit, I prefer 15W40 or 15W50 mineral blend.
Had better oil pressures on a hot day racing ( Capri V8 & Capri 3.0) with 15W40 mineral compared to 10W40 semi syntetic (both Valvoline brand).
I have an decent size oilcooler with stat and oiltemp gauge and steady temps around 110' Celsius.

Semi & syntetic can handle more temperatures, but with a decent sized oilcooler you can handle any oil to its grade.

Btw, i am running this Belgium stuff in all... SAE 15-W50 - 5 Liter - Oldtimerolie.be , (1000ppm) but i do ad some Cam-Shield ZDDP to raise the levels to 1600PPM.

With a roller cam & roller rockers you can get away with less ZDDP.

My new build engines are always run-in on 20W50 Valvoline VR1 Racing oil as it containes 1600ppm ZDDP.
 
I'd look at oil pressure while on track to determine which viscosity. My engine had cold idle of 90 psi, I dropped from 10W40 to 5W40, cold idle now about 80 psi, hot idle about 65-70. Builder recommends 15W50 for racing. That's with a LS motor.
 
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