Thanks, Len!
I think your white oil is great.
This morning I found my small Kaffir lime tree swarming with something that
looked like black aphids.
Quick, find white oil!
I sprayed liberally, but it actually was finished by then, and I needed
more. So, I mixed some of Len's, and....wow! it coates leaves well, also,
washes down all dead bugs unlike the commercial one, which wouldn't) . The
only observation....please make sure to put some old newspapers or other
absorbing stuff under the tree, as it is easy to get carried away and
spray...too much.
I did, and I now thank my nursery lady for making me mulch under the tree
when I planted it, and to put seven layers of newspapers under the mulch
first. That might have absorbed the copious amounts of vegetable oil that
would have went down the tree into the soil.

The aphids came with the tree from the nursery I saw them on another tree
nearby when I was picking up mine, and made it known to the nursery staff. I
thought mine was clean, and the bugs didn't show up for ...two months after.
Well, I hope I killed them all (and I will watch it) because I have 3 more
citrus nearby that I don't want them to pick up this 'plague'.

Regards,
Andr0