Can't understand why these cars don't have an OP gauge. You would see something there as it got lower. I had mine less than a month when I ordered and installed a gauge. Granted I did it for the oil cooler too, but I won't own a car without an OPG. No smart comments about electric.
Sorry for the OP, get a gauge installed buddy. It won't tell you about level, but when you get a feel for it it will tell you something isn't right. I had an old Celica that would drop a bit when down a quart and I knew it was time to drop one in.
GL