my car is ticking when im driving what could be the problem

My 2007 X3 has made that ticking sound (usually stops after it has been running for awhile) since about a year after I bought it. I took it in and was told it was due to the oil making it's way through the engine (something to that effect) and to not worry about it. That was 5 years ago and have never had a problem as a result so?