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Coolant loss, no smoke/vapor, no performance issues
About the truck: new-to-me 2007 6.0 F350 with 180k miles that was bulletproofed (studs, head gaskets, EGR cooler, oil cooler, injectors) about 30k miles back (I have full service records from the previous owner).
Performance is lovely, cranks easily, no power loss, and runs very smoothly with no smoke/vapor, but I drove it about 3 hours yesterday and lost the entire degas bottle worth of coolant. I do not see any white residue on the bottle or cap, or anywhere immediately visible, even under the truck (without taking anything apart yet). However, I did notice a little bit of black liquid slowly dripping out of the exhaust at startup (watery, sooty) that stopped after about 3 min of warming up. It didn't have a strong smell, but I'm wondering if this may be related.
Anyway, I know the EGR coolers are notorious on these things, but according to the service records the one that's currently on it is from BulletProof, so I'm not certain that it's that. I'm also not convinced it's a head gasket issue either, because they are relatively new OEM gaskets with ARP studs, and anyway, I'm pretty sure if it were that and I lost THAT much coolant in just a few hours, it would have an effect on performance, or I'd see white smoke coming out of the tailpipe.
Before I tear into this, I want to hear from people who may have more experience with an issue like this. If it is a leak, what locations are the "usual suspects?" Again, I really am not convinced that it's a head gasket/EGR cooler, but what's a good way to rule those out just to be on the safe side?
Thanks in advance!