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Hi my name is Robert....
Yes I would change out the oil and oil filter, rather be safe then sorry on this. 650 to replace the rear main seal is a very good price on this and I would go with it......
Hope this helps some.... Robert.
If you are satisfied with my efforts please feel free to select a star rating on the page. Robert
Was just checking in to see if my answer helped, IF you still have more questions or concerns please feel free to contact me..
Have a safe and happy Thanksgiving... Robert