The dipstick tube that’s protrudes into the sump was a very tight fit, the external tube that I think your referring to was very loose, I think there’s an O ring on the bottom of it, I just smeared some silicon sealant over the O ring a pushed it in, that was 2 years ago. No sign of a leak so far. If you are referring to the dipstick, then the only thing it could be is the rubber part at the top has shrunk slightly, there are products that will rejuvenate rubber seals to make them soft such as windscreen wipes etc, cant say I've ever used them though.
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