Welcome. First without a monitor, you are just guessing like anyone would do when they are not informed of the engine vitals. Before you do anything, do this......Write Up: Monitoring the 6.0L PSD.
Next, don't hesitate to install a coolant filter. Any reputable coolant filter will work, the IPR coolant filter is the best on the market.
For oil, alot of us use rotella t6 with great results. Make sure you are using motorcraft or racor filters with matching caps, only.
If after monitoring it looks like your oil cooler is clogged, I would suggest you dump your coolant, flush with tap, flush with 24 gal of distilled to get to a ph of 7, then add 3.5 gal of elc with the cat ec-1 rating. Do this with the thermostat out, and at least drain the drivers side block plug each time. Then change the oil cooler. If you flush with chemicals, you are sure to clog the oil cooler, if you do it and dont do it correctly, it will haunt you for a long time. For example, people who flush with chemicals and dont flush thoroughly enough, or can't finish once they start, and leave water in the block for a period of time, end up with major problems that follow them to no end.
If you decide to keep the egr cooler, the bpd is the best on the market. If you decide to delete, stay away from the two piece design, been hearing about recent problems. Read all the stickies. Keep reading, it takes time to absorb. Monitor, monitor, monitor.
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