Oil weight makes a big difference.
Like Adam said, stone cold is best time to check when it's all down in the pan. If you use a higher weight oil it takes much longer than a gas stop to drain back down to the pan.
When we changed to 15W50 and it shows 2 bars low after a fill-up with cleaning the windows (about 10 minutes). Freaked my wife out because she didn't know I had changed the oil weight. Flip the key when it's cold and it's all bars on the digital guage and full on the stick.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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