I've searched and could not find an answer, so I thought I'd ask here due to the knowledge available. I've had a few dmaxs and they always have had very low iron numbers on UOA. Recently I had to repair a lower oil pan and was surprised to find a large round magnet inside. It had a little metal on it that it's attracted over the last 230k miles. My question is, do the other Diesel engines like cummins and ford use magnets in their oil pans these days? Also, how much will a magnet skew the true Fe readings of a UOA?