UKPassats

Hi, this is second time l have done this (first time with this car)... it's a common rail diesel engine. the tank was empty (warning light on) and l put 16 litres of unleaded in the tank. was thinking to call a company who sends a guy with equipment to get the fuel out of tank, but decided to just fill it with diesel. l think there was about 5 litres of diesel left in tank and l managed to put another 58 litres of diesel on top. so its 63 ish litres of diesel mixed with 16 litres of petrol in my tank. from what l know l need to put some 2 stroke oil in cars tank ASAP, BUT which oil and how much????

ANY answer and advice is very welcome.... TBH l hate my self for being so stupid ATM !