Yes, for you 5w-40 would make sense but so would GC which is incredibly robust and stronger than many 5w-40s. If you have Redline available locally, that's another strong oil.
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well I used 5-50 castrol and my motor made alot more noise. Now I'm using 5-40 and my motor is alot quieter. Maybe I got bad oil. But I have always used castrol syntec