David. wrote: One of the advantages of both these oil draining systems is, once fitted, you don't need to continue to screw a Steel drain plug in & out of an Aluminium sump.
Have had experience of a sump drain hole thread becoming stripped on an RT by the plug not being fitted correctly or overtightened by a.n.other.
(Managed to recover sufficient of the thread using a plug tap).
Also, after having a car serviced, the sump drain plug partially worked it's way out, was finger tight, again by a.n.other.
I can understand your reasoning.
The a.n.other working on my bike is a BMW dealer technician, and I know I would get unfavourable comments if he found that the drain plug had been replaced by a non-OEM piece of kit (and he considers himself competent to re-fit and tighten a drain plug). That's what stops me for now.
If in the future I go back to changing engine oil myself I wouldn't even consider sucking the old oil out even if it was easy to do. I would still choose to use the drain plug, re-fitting it with a new crush washer, screwed in by hand then tightened to the recommended torque using a torque wrench.
Not saying that's what anybody else should do .....
