I figured that I'd toss this tip out there since it's ramp-up season ..
If your #2 oil burner is beginning to "squeal" .. chances are that you need to replace your oil filter(s) .. the pump is working super hard to pull the oil through the clogged filters.
I replaced mine yesterday and the squeal is gone .. the oil sucking pig is happy again.
I have a Westwood TigerLoop Ultra
with a spin-on FT100 as well as a cleanable pre-filter .. the prefilter was pretty clogged up with think icky black goop.
The pre-filter that I have is a 40-Micron Combu #70453
You might also notice my ITSA oil meter, which a dear friend from this Forum gave me as a present once (Thanks Chris!)