alright my d16 started to make a knockin noise on the way home the other day. i brought it home and checked the oil. it looked really thin and watery so i changed it. once i did this i took it for a drive and it quit for a little bit. well my step dad said it sounded like it was the timing but i told him it sounded like a rod knock. well my brother in law listened to it and said he thought it sounded like a rod knockin to. i showed him the oil and it looked like water. so we opened the radiater and i stuck my finger in it and it had a little bit of oil floatin in it. so we opened the overflow and he stuck his finger in it and pulled out a big gob of oil. he said head gasket, cracked head, or cracked block. does any body have any ideas if that is what it could be. and also i had just put an aem cold air intake on it could that have anything to do with it. any info is more than welcome thanks.