Check the label I dont think Mobil 1 extended performance meets GM 4718M. I would use the normal Mobil 1.
I will say this, I have a 09 Z06 with low miles. It picked up a mild piston slap sound during warm up. I have since switched to Pennzoil Ultra and after about 1,000 miles the piston slap has disappeared. I also only use Top Tier gasoline now.
I will say this, I have a 09 Z06 with low miles. It picked up a mild piston slap sound during warm up. I have since switched to Pennzoil Ultra and after about 1,000 miles the piston slap has disappeared. I also only use Top Tier gasoline now.
