Anthony, you might want to try a 'scum-ball' or similar - they are a cellulite material that absorbs oils off the top of the water - you can either float one in each skimmer or set a few free into the pool. For body oil or suntan lotion, you can rinse them and reuse - with motor oil, I'd make them a 1 time use thing and dispose of them after they've done the job.