So engine was still cold. Coolant temp had just about gotten up to normal operating temp and I noticed the oil pressure was jumping up to around 70-80psi sporadically. It did it some times right when I let off the gas and sometimes right when I let of the brake and hit the accelerator. Is this normal when the oil is still cold? Oil temp gauge said <122*. Once I drove it another couple of miles it seemed to get itself under control. I am still under a 12,0000/12month warranty from the Chevy dealer who sold me it. Should I be concerned?