+1 for Comma Flush Out.
Works a treat.
I've used various "additives" before draining also.
This thread makes interesting reading.
https://the75andztclub.co.uk/forum/s...d.php?t=291375
Whether using a flush or not I'd definitely change the oil & filter. I'd be doing the fuel filter, the air filter and probably the pollen filter as well. Oh, and a brake fluid change.
.
Andy.