The filter you mention is for a Disco 1, your profile says you have a Disco 2. You need an LPX 100590 for that.
https://www.jgs4x4.co.uk/discovery-2-defender-td5-engine-oil-filter-genuine-lr/#:~:text=Discovery 2 & Defender TD5 Engine Oil Filter MAHLE OEM&text=Equivalent to Land Rover part number: LPX100590.
The rest of this may then be immaterial.
But if you DO have a D1.....
Did you smear a bit of oil on the rubber seal when you fitted it? Did you make sure the seal came out with the old filter when you took it off? They do usually come out with it, but you never know.
I'd put a pair of rubber gloves on, tighten it up as tight as you can by hand then wipe it off and do what you have just done. If it is still leaking I'd let it cool down and the oil drain back into the sump, then take the filter off again, which will be a bit messy and investigate the seal situation. It is just possible there will be two in there. The one attached to your new filter and another one left behind in the past. If it was fecking hard to get off, it could be because the previous owner had the same problem but cured it by tightening it up to feck.
Failing that we are into the realms of distortion or scratched sealing surfaces.
Does any of this help?

Hi SS,
thanks for then suggestions, I will check it out,I think the filter is right...mine is a petrol.the link you sent was for a TD5.
I am sure the old seal was on the filter that came off ,but will double check.I was surprise dhow loose it was .
I do have a K&N in my shed i could fit.
Thanks you
 
Bit confused?..I did this , filled filter with 3/4 full of new oil , smeared rubber seal with clean oil and hand tightened with a rubber glove.
Maybe I am not strong enough these days in old age.
What is tight to me may not be to a 30 year old.
Cannot understand why you say its the wrong filter.

see link it saye's Disco 2 V8 petrol.
https://www.jgs4x4.co.uk/discovery-defender-range-rover-engine-oil-filter-genuine-lr/
Re the Disco, your profile info simply says Disco 2 so I wrongly assumed TD5 diesel as they are the commonest.
My bad.
So you do have the correct filter. Ad yes, once really hand tight, with a rubber glove, or better still a pair if you can get both hands to it, should do it.
 

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