I had an oil change done on my `96 Camry recently at my regular mechanic, and shortly after I noticed that they forgot to replace the oil cap. It was lying elsewhere in the engine compartment, so I put it back. The oil dipstick shows that I still have plenty of oil (I had not driven much). Needless to say, I'm rather disappointed with my mechanic, whom I have been using for years. Besides a bit of a mess due to oil persumably splattering from the open hole, are there any ill effects that could result from this blunder?
Thanks.
Chris