When i was looking for the coolant drain plug on my 3vze block i loosened some sort of oil plug, located beneath the oil filter at the front of the engine. Its the 8mm allen plug just above the oil pan. i THINK its the oil pressure relief valve? it doesn't want to tighten back up and i dont want to risk over tightening it. anyone know what the bolt is for and did i mess something up?
thanks