This undertray seals the oil cooler ductwork the same as a new OEM center felt section. I would suggest however that your whole issue of potentially abnormal temps would not be due to damaged or missing undertray parts. Temps can fluctuate depending on oil level, oil/coolant quality, component condition, driving style, ac on/off, environment, etc. You need to get the basics settled first before troubleshooting, i.e. make sure your car's undercarriage components are complete and in good condition. This tray will settle that part of it.
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