Did the 3rd oil and filter change on my Raptor at 4988.7 miles. From here on I will do them at 5k intervals or once every six months. The first oil change I used the recommended Motorcraft SAE 5W-20 synthetic blend, for the 2nd & 3rd I used Motorcraft SAE 5W-30 synthetic blend because it gets really hot in OK during the summer months. I don't foresee this as detrimental to anything except gas mileage, maybe.