Greetings, first time poster here. A good friend of my wife's recently acquired an 87 Carrera with a bit over 100,000 mile on it. Since I'm a motorhead, Porsche fan and a decent wrench and manage to keep my Fox Mustang and my wife's Spitfire spinning, I've become a caretaker on this 911. Did it's first oil change this weekend along with an air filter. (I know now why decent Porsche mechanics make so much money
) Used Valvoline 10w30 full high mileage synthetic. I'm getting around to my question now. By poking around on the net I found the oil pressure gauge is in bar. so at idle when hot I would guess the motor is at .5 to .6 bar so back of the envelope that's about 8-9 lbs of oil pressure? Is that pretty normal for a bit higher mileage motor? When revved it picks up around 1 bar per 1000 rpm. Motor is dry underneath, no obvious leaks, pulls strong. Should I be using a bit higher viscosity next go round? It has used oil since she bought it about 5 months back, I drained maybe 6-7 quarts when you figure in the filter. I had topped it up when she purchased it. I have no idea of the history of this car and wasn't involved in it's purchase, so since I know which end of a wrench to use but have no experience with 911 motors, I'm trying to be the best caretaker I can, because she might tire of it and sell it to me. lol.