Xsara Picasso 2007 problem

[Aquilani]

hello. we have a Xsara Picasso 2007 1.6 petrol 16V 80kW car. yesterday i put in new engine oil and a new oil filter. but now i have some oil dripping slowly underneath from the sump pan/oil pan where the nut(drain plug) is in. over night there was a nice oil stain on the floor today, so it's slowly dripping. when i was unscrewing the drain plug there was no classic washer on it(copper, rubber, steel, etc), there was only a really thin layer of steel or similar material here and there on the drain plug thread, that i just break up by 2 fingers and it crumbled apart. then i tried putting on 2 similar but different thickness of copper washers(i have many different ones) but with both when i wanted to tighten the drain plug back it only goes so far, it does tighten a bit, but if i tighten more it doesn't, it just starts spinning loosely from the start and i can't tighten it up really good, only somewhat. right after that i see oil start to build up right there at the washer. my exact drain plug below in the picture. it's a 8mm inside square drain plug. basically does anyone maybe know exactly what type of washer do i need so i could then tighten up the drain plug really well? or maybe possibly it would tighten if i just put no washer at all, considering that the mechanic didn't even put any regular washers on the last time he changed the oil...?

[PaulC5]

Copper washers I get from the Citroen dealer are about 1mm thick with an inside diameter only slightly more than the plug threads. Have you checked the plug and sump hole threads for damage, it might be the threads have been stripped so the plug can not be tightened no matter what washer is used. When tightening the plug use a torque wrench, I do not know the torque for your car but typically it will be no more than about 25Nm.

[wheeler]

Normally the older petrol models use a dowty type washer (metal and rubber) like these ones here >
https://www.ebay.co.uk/itm/166593056905 ... LUQAvD_BwE

[Aquilani]

Im like 99% sure the plug threads are just fine, because i clean it good and had a good look at it around and around.

The sump hole threads i just quickily shined a light into it and at first glance i didnt see anything suspicius. But i cant be 100% sure, id have to unscrew the plug and have a longer better look at it.

For now ill just check the oil level every day and if it starts falling then ill unscrew the plug again and have a better look...

[Aquilani]

Normally the older petrol models use a dowty type washer (metal and rubber) like these ones here >
https://www.ebay.co.uk/itm/166593056905 ... LUQAvD_BwE

Yeah i just dont know, on multiple sites it says that that one fits my car, but those flat and round( with a cut in it )copper ones fit also. And then the last oil change a mechanic did he put no washer in it at all.

Confusing...

[wheeler]

It may fit but does not mean its correct, Should be the dowty type with both metal & rubber.
Get the right one on it part number 016488 can be had for less than 1 Euro. The amount of oil you will use will cost you more than 1 Euro.