If you're going to refill it with oil for approx 500 mls to flush it(don't forget to clean out the oil strainer in the front down-pipe first), I would suggest using a Diesel oil (like Shell Rimula or similar) as it has a higher detergent content, so will clean the internals better than normal Petrol oil.
After the 500 mls, drain it, & clean out the oil strainer again, & renew the oil filter.
Probably a good idea to use Diesel oil long term to clean it further & keep it clean.
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