dvldoc, could the use of wrong oil cause a turbo charger to "sweat" oil? my 4m40 has a small oil leak at the compressor outlet of the turbo charger. im not sure if the leak occurred during the rebuild of my motor (failure to clean the leak from the repair) or after.

current oil used is Shell Rimula R1 SAE40 API-CD. ran 3,000km.