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Got home today and this is the story. I changed the oil over the weekend for my mother in law as a favor. Having never used the HD30 stuff before I thought it was the viscosity that perhaps was the culprit for the light. She just took the car in to the shop today where they diagnosed a bad...

Thanks for the calming advice! I'll replace the sensor. Cheers.

Could be a coincidence but the timing is suspect. She has 134k miles. I guess I can swap the sensor and see if it returns to normal. The HD oil is sae30 so I don't think that this could of done any real harm (although it's a thicker oil)?? She is not overheating or running rough.

2004 3.7L. Bonehead move: I bought Castrol HD30 for my last oil change. Drove for a few days and the low press light came on. Just changed oil to 5w30 with new filter. Light came on again after a short drive. Did I damage the oil pump by using the HD30 oil? Something worse?