If you find oil in your intake manifold, it's not something that should be ignored, but what has caused it isn't always clear ...

The negative effects of unmitigated carbon buildup can include poor fuel efficiency, loss of horsepower, check engine lights, misfires and excessive emissions.

Bolted directly to the engine block, the exhaust manifold is the first section of a vehicle’s exhaust system. It funnels exhaust gases from all the cylinders and routes them to the car’s ...