Salam, guys i got my oil changed from Toyota Cantt Motors Lahore, they opted for the drain plug method.
they open the nut and then opened the plastic drain tube as well, which resulted in 2.1 Litres of oil, then they fit the plastic drain back and started to fill the oil from TC nut, they were of the view that 2.1 came out so 2.1 will go in as well, so they measured it and started pouring, i think around 1.8 Liters went and it started to drain again, so they let it drain for few seconds and then closed it and stopped the inflow as well, so in the end total 2.1 Liters was not poured in, i think it was 300 ml short, they just closed it and then started the engine and connected their device to check temperature, after a while they started shifting gears to check if its leaking or not then took a test drive and thats it.
in all this process i am worried that not all 2.1 Liters got in, i did ask them and they replied that the drain overflowed so thats the sign that its full.
now since i have nearly half of the oil with me they advised me to get it change again after 20km, i dont mind that but i am a little concerned about the amount of oil that went in.
any expert opinions?