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I too was always of the opinion that the drain plug method was superior to the topsider. So I tried both methods against each other: Drained oil and then tried getting more from top: Nothing. Used Topsider on the next oil change and then opened the drain plug: Nothing. So both methods should work just the same. I still prefer the drain plug because it is faster and gives me the chance to inspect some things (e.g. harmonic balancer pulley).
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