You have a good plan. As you stated I found a dark ting in my oil following oil changes performed by various service organizations. So I decided to go the DIY route. I drained the pan dry, replaced the plug, and pulled the filter. While the filter area was drainied dry, I filled the new filter up with oil. This takes a few tries. Installed it. Filled the crankcase with top flight new oil and voila I still had a dark tinge. Hmmmm... The hotrodder in me was irritated. The next time I changed oil, after I installed the new filter, I pulled the pan plug a second time and found an additional quarter to half quart of old oil. I believe the upper oil galleries and, in my case, the displacement on demand manifold, vacuum locks until the oil filter is removed. Some of this oil drains to the oil pan while the majority drains through the oil filter adapter. After that clean oil on the dipstick! Much joy!! But, it takes three to four hours to drain the engine properly.
Absolutely!
And with the price of oil, repairs etc, no way am I letting jackball lube do it. They drain the oil, and as soon as the steady stream stops they screw in the drain plug! Bad bad.
Yep, like you I take 3 hours and let er drain right! Get out the bad!
Take care.