I have twin 135 hp Turbo Volvo-Penta Diesels. The Starboard engine is
starting to send fuel or oil out the exhaust causing a slick on the
water.

The Port engine began to use more fuel since this began.

I have also noticed that the Starboard engine was using a lot more
engine oil than the Port engine. In the past , both engines used very
little engine oil.

Does anyone have any suggestions as to what my problem might be?

Thanks