Oil temp jumps around… bad oil thermostat?

Averying · 09-23-2024, 05:04 PM

My oil temp jumps around sporadically at times… +/- 5°F at least. Could this be the oil thermostat? I already replaced the oil temp sensor, so I can rule that out.

Also, I’m noticing that my car seems to be running hotter than it did in the past. I’m wondering if my thermostat is not functioning properly, either not fully opening and/or opening & closing sporadically causing the oil temps to fluctuate quickly.

My car will quickly hit 200° on a 65° day, under normal driving, and I have a side mounted and ducted 34-row oil cooler. This also leads me to think that the thermostat is not fully opening. This temp seems to be hotter than it should be given the ambient conditions and my oil cooler setup.

However, oil cooler is hot to the touch, so maybe not a bad thermostat….

Anyone have ideas for what else this could be?

Sent from my iPhone using Tapatalk

09-23-2024, 05:04 PM	#1 (permalink)
Averying Enthusiast Member Join Date: May 2018 Location: Rhode Island Posts: 482 Drives: '09 370Z, '03 G35 Rep Power: 14419	Oil temp jumps around… bad oil thermostat? My oil temp jumps around sporadically at times… +/- 5°F at least. Could this be the oil thermostat? I already replaced the oil temp sensor, so I can rule that out. Also, I’m noticing that my car seems to be running hotter than it did in the past. I’m wondering if my thermostat is not functioning properly, either not fully opening and/or opening & closing sporadically causing the oil temps to fluctuate quickly. My car will quickly hit 200° on a 65° day, under normal driving, and I have a side mounted and ducted 34-row oil cooler. This also leads me to think that the thermostat is not fully opening. This temp seems to be hotter than it should be given the ambient conditions and my oil cooler setup. However, oil cooler is hot to the touch, so maybe not a bad thermostat…. Anyone have ideas for what else this could be? Sent from my iPhone using Tapatalk __________________ 2009 Sport Touring \| Platinum Graphite \| GTM Stage 1 Supercharger \| BC BR Coilovers \| Hotchkis Swaybar \| Z1 FUCAs \| AME TM-02 Wheels \| Z1 2-piece Front Rotors \| Z1 Clutch & Flywheel \| Invidia Gemini Catback \| GTM Resonated Test Pipes Last edited by Averying; 09-23-2024 at 06:02 PM.

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