The oil pressure should stay steady and the drop in pressure is not a good sign. Check the oil and look on the dipstick, right after you have driven it, and look for small metal particles under a good light. If you find any this indiacates engine damage. You might have a clogged port in the oil circuit.
As far as the temperature it can fluctuate some as the thermostat opens and closes which makes the temperature change slightly.
As far as things you should check, refer to your owners manual maintenance schedule and go by that.
Thursday, April 18th, 2013 AT 8:16 PM