Switching from dino to synth - lifter prob?

[Single Malt]

I decided to take my 01 S4 to an indy before my factory warranty expires (1k
left!) to check things out ...

As they were dumping oil from my boost tubes, I asked if they could tell if it
was dino or synth oil (since I had just switched to synth a thousand miles
ago).  Both the service advisor and the mechanic said to switch back to dino
immediately.  They were quite clear that I *would* have lifter problems (their
words: "every time").

Does any one have any information about this??

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