I fitted a new oil cooler 2 months ago , it appears to be leaking again , anyone got any idea what could have be wrong . Thank you

Why do you think it is leaking ?
If it is drips on the floor, did you remove and clean the undertray ?, they can take ages to stop leaving drip marks if you didn’t.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Smoke coming up around the oil filter and faint traces of oil in the coolant

There are two distinct areas of potential leakage. Around the oil cooler via the main gaskets, or the oil feed pipe via (2) perished O-rings.

When you changed it a couple of months ago, did you fit new gaskets and O-rings? Also, did you fit a genuine unit, or was it one of the cheap aftermarket ones? The older I get, the more I realise that people confuse wrinkles for wisdom

Cooler is made by nissens, it came with new gaskets , o rings were not changed but don’t appear to be leaking

I do wonder about the aftermarket quality - especially the supplied gaskets.

LR have actually made new gaskets with different part numbers from the original ones, presumably to help cure the problem of failure.

I also bought a complete top hose before tackling the job, but didn't need it in the end. Handy to have a spare though!

I too also thought the issue was perished rubber seals and o-rings, not the actual oil cooler. 2015 Range Rover Autobiography 4.4 SDV8

I understand the cooler can warp sometimes. The garage that did mine said they had also seen coolers that had cracked.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Wot MJD said. My cooler had warped slightly as they are 2 parts and weren't sitting correctly so leaked out.