I recently bought a pristine 1988 911 Targa 3.2L. It has 60k on the odometer and the original owner had extremely good maintenance done including all the service records. I always do a oil change on any car I buy just so I know. My local independent P mechanic changed the oil with
Mobile 1 10w-30. After looking through all the records I noticed the previous owner ran Castro 15w-40 synthetic.
What would you do at this point??? I live in central Pa. and dont drive my 911 in the winter months. Should I just run the M1 10w-30? Drain and switch back to 15W-40? or drain and use M1 20w -50?? I should add the car doesnt nor has ever leaked a drop of oil. I see in the manual 10w-30 was/is a approved oil. Please advise.
