Hi there, sealed for life is so very wrong. Anything with moving parts will produce swarf of some kind, plus the oil WILL break down over time. Ten years is WAY too long. The filter will become blocked to some degree, which can lead to poor delivery to the moving parts, and we all know what happens to parts starved of oil. 60.000 miles is about the max before a service. Would you leave your engine oil for ten years before changing it, no. I can recommend a very good auto trans garage. It might be a little way from you, but it will be worth the trip, I have used them for years. Here is their address. Suffolk automatic transmissions LTD. 01440 786555 07850 050122. They are very close to Haverhill. Why not give them a ring, ask for Paul, he's the boss, tell him Gary from Haverhill told you about them.