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3300John:
Hiya i used to pick up small flasks of olium from Jamaca road london years ago NOT nice stuff
Nasty stuff, that olive oil. I think you mean oleum, bud. 
Oleum is concentrated sulphuric acid, aka “Oil of Vitriol”. that is 100% sulphuric acid with extra added sulphur trioxide to give it those nasty fumes that’ll take the lining off your lungs if inhaled.
Lab “tech grade” Sulphuric acid is about 98%, which does NOT have the same fumes, but still causes bad skin burns a few seconds after contact.
Battery acid strength is nowhere near 98% on the other hand, so battery acid on the skin should do no more than sting a bit, like domestos on the hands…
Neat Oleum is not particularily strong as an acid, since the neat fluid is oily, and lacks water (which tends to be what makes acids “acidic and corrosive to metals”.)
However, it’s a strong dehydrating agent, drawing water out of anything it comes into contact with. This drying out of the skin is what makes it burn so much ON the skin.
It also heats up when absorbing water - part of the “burning process” is being scalded by the superheated liquid.
The boiling point of Sulphuric acid is so high compared to other acids - that it is considered one of the most stable acids, and can be used to drive other acids out of their salts.
Apply it to table salt for example, and you can capture and dissolve in water the vapour produced as “Spirits of Salt” - also known as “Concentrated Hydrochloric Acid”.
Add H2S04 to Saltpetre - and you can distill this vapour off as Nitric Acid.
Do not add water to this stuff, do not make it moist by letting it drip in damp air (pretty much everywhere), and do not touch it with anything organic like clothes, wood, skin, apples, cider, and very small rocks. 
If you wish to dilute it - you add acid to a large amount of water (I used to use a bucket-sized beaker as a lab technician) allowing for the heat to disperse as you do so, as it will boil the water if the oleum is added too quickly. It will form a layer on the bottom of the vessel, so it needs a bit of stirring with a glass rod to get it to mix in with the water.
Spillages of neat Sulphuric acid can be safely covered with Bicarbonate of Soda, or Washing Soda. Although the reaction is exothermic, it won’t catch fire. The reaction products are essentially Cat Litter, Carbon Dioxide Gas, and Steam.
Keep away from the steam though, as it’s likely to still have some unreacted acid vapour in it.
The Bicarb of Soda/Sulphuric Acid reaction was also used to force water out of the old big red fire extinguishers.
Back to the original confusion with Oleum and Olive Oil - Mix these two together, and you’ll end up with “Sulphonated Detergent”.