I just got back the UOA on my 1999 F-350 7.3 diesel. Everything was good, but the potassium was in the "Caution zone" with a reading of 16.
The truck has 135,000 on it and the oil is right at the 10K mark with 13 months on it. Running Rotella 15-40 through an Amsoil Ea099 and an Oil Guard bypass.
The truck really isn't worked hard, no real towing. I do run various fuels; #2 diesel, biodiesel, and a waste vegetable oil blend.
The last UOA had only 5K on it prior to installation of the bypass. Same oil. I don't remember the filter, probably whatever Wal-Mart had on the shelf. That UOA showed potassium of 11.
In regard to this UOA, the report said high potassium is usually due to coolant in the oil, but they went on to say that since no glycol showed up, they doubt it's due to coolant. I also show no signs of loosing coolant. If it were due to the veg oil based fuels, I would also think that glycol would have shown up.
They recommended I run the oil for another 2-3 thousand miles than either re-sample or change the oil.
I know this is a long post, but I wanted to give a complete a picture as possible. I only found info on low postassium when doing a search, not high. I swear, I haven't put any bananas in with the oil
The truck has 135,000 on it and the oil is right at the 10K mark with 13 months on it. Running Rotella 15-40 through an Amsoil Ea099 and an Oil Guard bypass.
The truck really isn't worked hard, no real towing. I do run various fuels; #2 diesel, biodiesel, and a waste vegetable oil blend.
The last UOA had only 5K on it prior to installation of the bypass. Same oil. I don't remember the filter, probably whatever Wal-Mart had on the shelf. That UOA showed potassium of 11.
In regard to this UOA, the report said high potassium is usually due to coolant in the oil, but they went on to say that since no glycol showed up, they doubt it's due to coolant. I also show no signs of loosing coolant. If it were due to the veg oil based fuels, I would also think that glycol would have shown up.
They recommended I run the oil for another 2-3 thousand miles than either re-sample or change the oil.
I know this is a long post, but I wanted to give a complete a picture as possible. I only found info on low postassium when doing a search, not high. I swear, I haven't put any bananas in with the oil