Never fill, even with worn out oil there’s no reason the lubricated surfaces shouldn’t have a sufficient film to protect them. Especially with the 30 ish minutes that an oil change will take. That’s coming from a guy who still changes synthetic oil every 5k or so. 
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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