i just had my piston and piston ring done on my lsvtec i have p73 pistons type-r i believe...well i was gonna change my oil cuz it looked to dark and when i was taking out the last spark plug comes out with oil some told me i either fuked up the piston or that they didnt do the job right and also that it can b the valve seals....is there ny test i can do to know wat it is ? also wondering wen i first turn on my car it idles low i have to step on the gas not sure if this could be the cause of that
