Many LR's leak - if theres no oil under it, theres none in it after all. Depends, im not sure how reknown the TDi's are for leaks but the older engines tend to do a lot of it. The x-fre box leak would bother me more though. If the oil smells like cabbagey kinda smell, its gear oil and should b in the x-fer box, else ATF is normally red, i think?