I went to my mechanic to find out that the oil pressure switch was leaking and needs to be changed. He first said its cheap like $30 and $50 labour. Then he looked it up and said the part went up to $75. I had it fixed and later called his parts dealer and they would sell it retail $30. Now I don't know if I can trust this guy again. I though the parts dealer gives them a check periodically as a bonus. I don't know if the guy was thieving me. I later asked him if perhaps they made a mistake on the price of the part and he said no mistake, he said thats what the dealer charges him.