It's not cheap, but IMO you should get a BPD oil cooler if you want to do it right. I've seen and read too many cases of people doing everything they can think of to keep the oil cooler from clogging again and still had to replace several more oil coolers in the future.
Now, not to start an argument here, but the BPD external oil cooler is not something every 6.0L owner needs to do. And depending on how you use the truck, it may actually have an adverse effect on things. *Note* this is not a bash on BPD in any way, they make a great product, it simply doesn't fit every build.
Two particular conditions where the external air-to-oil cooler comes up short.
-First, cold starts, with the coolant-to-oil heat exchange your oil temps will come up to OT much quicker than they will with the external cooler, even with the cold weather package installed. The truck will start and operate well, but it will be delayed comeing to full OT.
-Second, heavy towing, where oil temps will climb higher relying on the air-to-oil cooler. Remember that stock Ford programming has the fan clutch engage at 230* of coolant temp, so while the oil temps are going up toward the 254* that trigger de-fueling, that coolant temp may not warrant the fan to engage. This is overcome somewhat with aftermarket custom tuning, but if you are running slow on the grade, with a heavy load, there is only so much air that is going to pass through that external cooler, vise the heat exchange that occurs with the OEM unit.
Not a shot against you Snake, or BPD, but it is simply not a modification that fits every build out there. I just want to ensure the OP has all the info to make an informed decision for his build.
With silicate-free ELC in the system, there shouldn't be anything in the system to clog the stock unit, with a good coolant filter installed.