I've been using Mobil 1 because that's what GM put in our cars. I was tempted to use Valvoline SynPower (synthetic) oil because it was a bit cheaper than Mobil 1, BUT:
I don't know if this has been asked - I was reading the 'additional' instruction manual and it states that for V6 use GM6094 certified oil. For V8, use GM4718M synthetic oil.
When I read the labels on Mobil 1 and Valvoline SynPower, only Mobil 1 states that it meets both GM 4718 and GM6094. Valvoline only has 'GM6094'.
Should we be using Valvoline SynPower for the SS Camaros?
I did go to the Valvoline Website to find if it can be used in our Camaros, and this is what it said: "Because your CAMARO is a performance vehicle.....we recommend that you use Valvoline's SynPower Full Synthetic Motor Oil. SynPower delivers superior engine protection by fighting the 3 major causes of engine stress: heat, deposits and wear. SynPower provides outstanding high and low temperature wear protection, superior cold start properties and powerful detergents to help prevent deposits and sludge."
No Brand loyalty; my loyalty is to my money!