One of our diesel engines, duramax 6.6, has had some minor leaks in the seals around the block. Nothing major, just every couple of months right before the oil change we ll notice it gets a little low. No biggie. Question here is it seems that the oil is breaking down. Sooner than any other vehicles. Oil pressure hangs out at the low side of the gauge at idle and not a whole lot higher until you really start driving. ANy additives to throw into the oil to basically stiffen it up some? Almost like a radiator stop-leak but for the oil.