SuperTigre say that the low-oil recommendation applies to the 3000 and bigger (which means the 3250 and 4500 I guess).

However, if you're using a *decent* oil, you can run 12% in all of them.

We run 12% oil in our G90s here and it goes a very long way towards tidying up the crappy mid-range that these engines often exhibit.

Many, many hours and not a single failure on 12% Coopers oil.