How soon to change RMS?

[derbylad]

If you think your Rear main seal is leaking oil, how long should you leave it before getting it changed (car's 6 years old and no warranty)?

[derbylad]

Where would the oli drip be found? I can't get right under the car to see it's coming from.

[derbylad]

It's about 6" before the axle line. It does not drip everyday and there's only drips in my garage, but non in the space where I park at work. The drip's about 1/4" in size with a black dot in it's centre.

[derbylad]

Just been under the car and the RMS joint is as dry as a bone. The oil is coming from were the drive shaft goes into the gear box.