A friend of mine has a 2012 Nissan Juke and I heard it start today after sitting hours. It started fine no issues but the engine sounded like a diesel for like 2 seconds not so much metal on metal but like the engine was moving slow then picked up. He stated it has always done that. Is this normal? Oil level is good, no driving issues , and after that start it doesnt do it again till after it has cooled down.