Where to dump old engine oil?

[Atomic]

I wouldn't worry about flushing the oil with some special crap. Far more important just to change it regularly.

If you really want to make sure you have as much nice clean oil as you can in there, after you drain the oil, start pouring new oil in (with the sump plug still out). When the oil coming out turns from dark old oil to nice golden stuff then you can put the plug back in and start filling up the sump.

I do high kilometres and change oil every 2000kms. I have all these milk bottles lined up in my garage in one corner ; when the Hazmobile guys come around I get rid of it in one shot.

or even better, drain oil, start engine and hold at redline for several minutes till you have drained every drop. fit sump plug and fill with repco 30w30

[xwhatsit]

or even better, drain oil, start engine and hold at redline for several minutes till you have drained every drop. fit sump plug and fill with repco 30w30

Yes. I'm sure that my Haynes manual recommends running my engine at red-line with no oil too.

[avgas]

I have all these milk bottles lined up in my garage in one corner

Your coffee must taste like shit