Thanks for that explanation about the dangers of using compressed air, rsnald. One of the problems though if one is having an oil change at a gas station is that the supervisors usually want to make the process as fast as possible (more customers, more money), so they would insist that the mechanics use compressed air to speed things up.

Kanina nga nagpa-oil change ako sa Caltex dito sa amin, gusto pang gamitan ng flushing oil yung makina ko, buti na lang pinigilan ko sya.