My 1998 740I

Voltage tends to move from around 13.8 to 14.2 so I would say you voltage may be verging on being too low.
Mt temps go anywhere from 98C to 114C, so I think you are safe with those readings...

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1987 E30 320I M20 Manual
1995 E34 525I M50TU Auto
1998 E38 740I M62 Steptronic