looking at getting a egr delete kit for the truck.2 places told me 8-9 hours and change the oil and antifreeze while they're at it.1 place said 12 hours because they take off the intakes and clean them but nothing about the oil or antifreeze.and the other 2 didn't say anything about the intakes.if the intakes don't get cleaned out ,will it hurt the delete kit or something else down the road.who's right and who's wr:nailng.