tailslide,
Yeah, using full synthetic does blow a hole each time.
Tactically, I started by buying two 4 litre packs, then use half of
each bottle to top up, leaving two bottles with about half left. On
the or before the next change comes around I will add two three
bottles of those small 0.5 litre packs to make up 4 litres. This
way, it only costs half of a full bottle every subsequent
change.
Of course, I would also use some additives, and would fill up the
the large bottle to the brim, so that it will always be about half
left after changing oil. I just need to top up the
difference.
Works for me always. Should try it out.