It seems that my oil leak was caused by a crack in the oil pan right where the drain plug threads in. I'm always cautious about over-tightening drain plugs as I once made this mistake when I was 16, and stripped the threads of the oil pan in my first car. I'm not sure if this crack was present when I did the first oil change on this car, but I can surely say that it didn't leak like a sieve after that service, so I must have damaged it when I did the most recent service, although if using normal hand pressure with a wrench can crack a Jag oil pan, I'd hate to see how easily a rock or other object could put a massive hole in it! Anyhow, I'll be 'wielding the 'Weld' today to see if I can [hopefully] patch her up.
I have the same problem with a 1990 XJ6. Were you able to patch the leak ?
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