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If you are just topping the oil off, mixing in 5w-20 with whats in there will work just fine. I prefer to run a conventional 10w-30 (Mobil Clean 5000 to be exact) in my '95 Nissan engine. I would suggest a 10w-30 in the summer and a 5w-30 in the winter(colder) months.
So to top it off, what you bought is fine. When its time for an oil change, throw some 10w-30 in it
