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So I recently bought a mazdaspeed 3 and I've read that the owners manual calls for 5w-30 oil, however, the guy that I bought the car from has regularly used rotella t6, which is 5w-40. I was wondering if it would be fine on my engine if I were to switch back to 5w-30. The type I had in mind was...

So you can switch between those oil types without harm? This is more what I was searching for on this thread, because I bought a mazdaspeed three and the guy before me used the 5w-40 rotella T6, and I wasn't sure if it was alright to switch back. The oil I had in mind was pennzoil platinum.