Laugh or cry all you want about oil but I ran Pro Line 20W50 in one of my beat old Toyota 4Runners and never had a problem with it. I have no idea who makes that oil but it served the purpose.
The OP made a good post about what he thinks fixed his tapping noise and we should all post up about a possible solution to our tech questions and follow up research. We can disagree about what we think is the best oil, oil filter, air filter, spark plugs, spark plug wires, coils, headers, exhaust system, tires, muffler bearings. But personal experiences with certain products are worth asking about and posting your own results. I have no problem with opinions, but real world experience carries more weight for most people.
-