The high count tooth blades for metal are the way to go. The higher the
count, the smoother the work and the thinner the material that can be cut,
just like with a hacksaw or other such blades.
Wax vs. oil vs. WD40 is more personal preference as each of them works as
does dry on certain types of aluminum. Kind of like what gas you put into
your car. Some people put only premium Sinclair into their car and would
consider anything else to be trash while others use regular gas from the
cheapest pumps and wouldn't consider using the expensive Sinclair stuff as
it is just a waste of money. Thus, the lubricant that you find working well
on cutting aluminum by any other method. I'll also note that different
aluminum alloys want different lubricants when machining so be aware.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!