Flew from Nashville TN to Burlington VT and back, and noticed when cruised out at above 12k feet, oil pressure fluctuated in the 54-59 range (normal is above 70)per the CGR-30P. Turbo-normalized 20J, I've been playing with ROP settings per the POH, and have only recently started flying higher than 12k since buying o2 tank. Never had this issue previously, wondering if combo of altitude and leaning the engine could have this affect? Doesn't really add up to me.