Reconsider 5w30. Today's engines are built to tighter specs and need thinner oil at first. City ran 5w30 in squad cars with no problems and those cars are NOT treated gently.
I'll run 5w30 to 50k then switch to 10w30. I changed the oil at 3k, 6k, and 10k. Based on senility, I change the oil at 5k intervals so I don't have to remember when it was what. It hits a 5k multiple, I just change it.[:I]
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