Are you supposed to put oil on a gas bbq grill?

No. You should not put oil on a gas BBQ grill.

Oiling a gas grill is not necessary because residual oil from cooking will lubricate the grill's grates. When oil is heated to a high temperature, it can carbonize and leave behind charred, sticky residue that is notoriously difficult to clean. Over time, grease build-up can also interfere with the correct performance of your grill.

If you think the grates need lubrication, you can wipe them with a lightly oiled paper towel before preheating your grill. Never spray an oil-based cooking spray directly on the grates or the flame-taming device, as it may cause a flare-up.

A great way to keep gas grill grates clean is to preheat the grill on high for five to ten minutes before cooking. This will burn off most food residue, making it easier to clean the grates with a grill brush.