Spark plugs are a big thing. Make sure you use antiseize on them when you do them. Brake clean around the plugs and blow them out with air before you pull the plugs. 3rd cylnder bak on the pass side will get dripped on by the water that runs down the coolant hose from a leaky hood seal. All of them do it at some time. If you start to get a miss it is most likly one of your COP and it takes 100 miss fires in one key cycle to trigger a check engine light on that style of truck.. As far as oil i ran 10-40 Valvoline in mine from new till 170,000 and never had a issue. If i remember anymore i will chime in with it.
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