Just a thought, when I use castrol syntec, my valves are a bit noisy..so I switched back to mobil 1, quiet again. When I use Citgo gas a slight ping occurrs, switched back to Amoco gas, problem solved.
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1998 Mustang Gt
C&L 80mm
Steeda Underdrives
Steeda Tri-Ax
Magnaflows
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