Advice Please

Guys

Need your kind assistance once again.

Was supposed to collect the Zed today after having new turbo's and other bits done. Just got a call from the mechanic informing me there's a problem:(

He told me that somehow, water is getting in to the oil sump, resulting in white sludge on the dip stick and white smoke from the exhaust. He's checked the hoses, done a water pressure test and all is fine. Told me not to worry and he will investigate further on Monday. Whilst I do have faith in him, I am worried! He also said there may be a problem with the new turbo's but wanted to eliminate other possibilities before tackling the labourous turbo's.

Does anyone have any ideas on what the problem is and more importantly, a cure?