I have a 2009 SLT with 5.7 HEMI. Three weeks ago I changed over to Synthetic oil (Mobil 1) in 5w20. last week the check engine light came on and showed a oil pressure switch problem. I replaced the switch and then the wife called and said it wouldn't start. I got it started and took it to a shop and was told the oil pressure switch was bad. They replaced it at no charge today the check engine light came on with a oil pressure switch problem, Any Ideas where I should look? At $50 a switch this will get expensive to keep replacing them. Should I change the oil back to the old oil I had been using. This vehicle only has 27,000 miles on it and we don't want to buy a new vehicle.

 

Check the wiring.