Your engine temp is normal. No need for concern here. Honestly, I couldn't tell you the oem thermo temp, but be sure that's what you use. There are lower thermos out there, and they are not ideal. Had a friend who went to a lower switch, and he had issues.
As a new owner of an e36, one thing to know, is the coolant system is easily the weakest part of these cars. Careful maintenance is necessary, if you want to ensure a long life for your new Bimmer. New water pump every 3yrs or 60K, and a coolant flush (with oem colant only) every 1.5yrs or 30K are wise investments. The BMW inline six is virtually bulletproof, but the coolant systems are from it.
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