Was the replacement turbo new or reconditioned ?. I had my turbo rebuilt by a specialist and when I got it fitted the engine was still smoking. Caused me no end of hassle as I then figured it must be the rings and got the block bored etc.
To eliminate the turbo I plugged the oil feed and let it idle for a few seconds and the exhaust was clear...
Might be worthwhile doing a compression check although i doubt this will show up anything if the oil control rings are worn.
I guess some wiser people will be along in a minute
