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You can switch any time.
Problems with leaking seals are more common in cars built 20 years ago.
Mobil 1 is a fine motor oil. I switched my wife's 850 to it at 30K miles
and my 98 T5M (yeah, I know you love it!) at 1200 miles. The only one I
have heard any real complaints against is Castrol which has a synthetic
that is not as synthetic as it should be (Mobil has even sued them, but
I think they lost).
Synthetic might churn up some oil deposits so a couple of oil changes
at, say, 3000 miles after you switch could help flush that material out.
This might depend on the milage on the engine.
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