text: what is the best way to get rid of poision ivy? how is the best way to change theoil in a olds eighty eight? how much new oil should be put back in?how much does this all cost to buy? there is a lotion called calomine i think for poison ivy. and take some anti-histamines. 5 quarts of oil in the olds. open the oil fill cap, remove the drain plug on bottom of oil pan, let oil drain completely, remove oil filter, fill new filter with clean oil, put oil plug and filter in, fill with 4 quarts, run engine 5 minutes at idle, turn off, check oil and fill to full line. oil and filter should not cost more than $14 at advance or auto zone.