I was told by CR turbo's even if the turbo has had oil going through it then it won;'t have had any effect.

I done exactly what you're wanting to do and sent it to CR turbo's and then it had a new 360° thrust bearing, all seals etc basically a full rebuild. It didn't need it but once you've sent it to them you're int he position where maybe you're stupid not to do it?

What pissed me off though, was I was told it was £400 and something, so gave my card details over the phone. Loked at my bank statement a few days after, and the price they quoted me was +VAT!