During my inspection period, we noticed signs of an oil spill around the tank outside.

They will not accept things such as flushable wipes, personal wipes, baby wipes, paper diapers, sanitary napkins, tampons, wads of toilet paper, dental floss, balls of hair, paper towels, newspapers, grease, oil, table scraps, bones, clothing, rags, sand, dirt, rocks, or children’s toys.

I work full time as an assistant at a oil and gas company and I'm also a full time student at Angelo State University working towards a Masters in Business Administration (MBA).

"And so you add the lemon juice after applying heat.""

Oil furnaces may be different as they may have soot build up which gas and electric generally do not have. 

Just know that a 2nd system (new power meter, separate oil tank, 2nd gas line/tank) will require a larger upfront cost and your city and utility companies will likely want to come in, and double check everything you've done (more time and money).

Those are both oil issues, which actually helps nat gas commodity pricing (long story on why that's the case, but I'll save you all the boredom of my industry's dynamics) which is prevalent in this area.

I know I can plan for a roof or an oil burner and such items within a fairly predictable time range, but I am putting away “X” amount of dollars for those things each month already.

You need to get down to the sub floor, treat and paint with oil base kilz.Base boards and drywall will need to be removed up about 2 feet to eliminate all urine.

So, if for example if heat is paid by the landlord and the building has an old oil fired boiler and you swap that out for a new high efficiency gas boiler you not only save yourself money month to month in operating costs, but you have increased the value of the property by a predictable amount.