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So in the 3 years I've owned my 335is I'm pretty sure the oil temp has been fairly consistent at around 240 (just shy of the middle mark) through the year, whether hot or cold.

I happen to notice that this past week it gets to around 220-230 and then the needle actually goes down and up a little when it hits that temperature. Now maybe this happened before and I never noticed, but I noticed it now.

I shot this while parked after driving the car for a half hour. It's 45 degrees outside.

https://youtu.be/dmxugB1ggh8

Is it normal for the gauge to go DOWN?
 

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Breaking in the Pony
2019 Mustang GT / 2005 Toyota Tacoma
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6,276 Posts
You're seeing the oil cooler thermostat open as you hit the 230F (110C) setpoint the first time, allowing the cold oil in the auxiliary cooler into the bulk of the flow. The engine builds to 230F, hits 230F, the oil thermostat opens, cold oil flows in from the unused-to-that-point radiator, temperature drops, the thermostat closes, oil rises, thermostat opens, warmer-than-before oil flows in from the radiator, rinse, repeat. It will bounce around most the first time it hits 230 then will likely reach equilibrium at some point.

https://www.autohausaz.com/pn/BM-11427573212
 
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