2014 XC60 D5 AWD oil change - K&N oil filter problem

[JGEM]

I changed my oil on my 2014 XC60 2.4D AWD over Easter weekend and used a K&N oil filter - part number was HP-7010

https://www.knfilters.com/hp-7010-oil-filter

The filter indeed fits OK, but the o-ring supplied was too fat for the oil filter cap and would jam / get dislodged when attempting to refit the oil filter cap. The o-ring on the oil filter housing cap was a skinny o-ring about half the diameter of the K&N o-ring. As shown in the picture on the K&N website the filter comes with both and o-ring and some other sort of sealing ring which seemed unnecessary as i could not find it fitted on my car.


Out of interest I looked at another oil filter (Sakura brand EO31070) which was also specified by my local parts place as suitable for the XC60 D5 and it had the same issue - o-ring supplied is too fat and also the other seemingly unnecessary sealing ring.

I just fitted the new filter and re-used the original o-ring fitted to the oil filter housing cap.

This has confused me a bit. Why are two different companies supplying an 0-ring that seems too fat? What is the other sealing ring being supplied for?

I looked up the Mann oil filter online and it does not seem to come with an o-ring for the filter housing cap, but it does come with the other mystery sealing ring.



Any comments / advice appreciated.