N53 oil temperature dropping at motorway speeds

bmwak · 12-04-2022, 04:04 AM

Hi all,

Since the cold weather begun, I have noticed that when doing motorway journeys my engine oil temperature does not stay to operating temperature. In normal use its fine but at motorway speeds it can drop all the way to the bottom.

I know the thermostat is usually the culprit for coolant temperature gauges but this my car shoes engine oil temperature only. Also, there are no fault codes to suggest thermostat stuck open or anything like that.

Anyone have any ideas on what it could be or what to look for?

Phil325i · 12-04-2022, 05:28 AM

Most likely cause would be thermostat in my book. If you check the engine itself, does it feel cool to the touch?

Only other thought is maybe the oil temp sensor is on the blink? Not quite sure where that is, but it may be part of the function of the oil level sensor mounted in the sump. Have you noticed any malfunction in the oil level/condition display on the dash?

My oil temp takes a lot longer to get to working temp in the cold weather, but once there, it stays.

12-04-2022, 04:04 AM	#1
bmwak Major 105 Rep 1,235 Posts Drives: 440i M-Sport Gran Coupe Join Date: Sep 2008 Location: London iTrader: (4)	N53 oil temperature dropping at motorway speeds Hi all, Since the cold weather begun, I have noticed that when doing motorway journeys my engine oil temperature does not stay to operating temperature. In normal use its fine but at motorway speeds it can drop all the way to the bottom. I know the thermostat is usually the culprit for coolant temperature gauges but this my car shoes engine oil temperature only. Also, there are no fault codes to suggest thermostat stuck open or anything like that. Anyone have any ideas on what it could be or what to look for?
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12-04-2022, 05:28 AM	#2
Phil325i Brigadier General 615 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Most likely cause would be thermostat in my book. If you check the engine itself, does it feel cool to the touch? Only other thought is maybe the oil temp sensor is on the blink? Not quite sure where that is, but it may be part of the function of the oil level sensor mounted in the sump. Have you noticed any malfunction in the oil level/condition display on the dash? My oil temp takes a lot longer to get to working temp in the cold weather, but once there, it stays. __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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