Thanks for the advice, guys. I have an appointment for next week. He was not in complete agreement, or in agreement at all. I told him I was under the hood and the valves were really loud and it freaked me out. And I want to change it back for my head. He went with that argument. An English speaking mechanic in Merida; I want to hold on to him. He had a Chevron shop in L. A. for 11 years, when he was in his thirties. He changes the oil, and the coolant, when it needs it. I’ll have him check the belts and hoses. I was under there looking for a coolant leak, as it was a little low. And soon, the suspension and the boots and articulations. Any major stuff I take to the dealership, which isn’t as expensive as one might think.