On Monday, November 7, 2016 at 10:02:21 PM UTC-5, wrote:
On Mon, 07 Nov 2016 21:38:26 -0500, wrote:

On Mon, 07 Nov 2016 19:53:57 -0600, wrote:

On Mon, 07 Nov 2016 19:24:00 -0500, wrote:

#2 (diesel or fuel oil) can grow a fungus if it does not carry the
right additive package.

I've never heard of that, but I bet it will still burn just fine.
It will plug the filters and if you don't filter it will plug the jet
orifice.

That makes sense.... But I'd think they probably have the additives in
the oil to prevent that from happening.

In the 90s I was part of a project to dig up old underground heating oil storage tanks and replace them with modern up to code tanks.

The oil I pumped out of the old tanks was pretty good even though it had been unused for many years.

A few years later some of the new tanks needed replacement, and we pumped the new oil. These tanks had a foot of jelly in the bottom. The experts told us the formulation of heating oil had changed and they now grew some kind of bacterial growth that didn't happen before.