I Have a 2008 6.4 ford diesel, 146k miles, had cracked heads pulled the motor, decided to go through the whole motor, machine shop said i needed cylinders honed out to 20 over, crank needed ground 10 under,ETC...So what i have is a totally rebuilt 6.4, cryo treated new connecting rods and pins, new piston, river city diesel stage2 cam shaft chromoly pushrods valve spring, o ringed heads, ARP studs, H&S MINI MAX,........NOW MY ISSUE, all put together, runs smooth, never had a diesel so smooth, cant even tell its running when in the cab, very smooth, but when i hold it at 2000 rpms i am leaking antifreeze from the freeze plugs, yes PLUGS, one is dripping, a consistent drip and two are seeping, the machine shop that did the work and installed the freeze plugs said that he didnt put rebuilders cube in and most shops put that stuff in for this purpose, he says i could try bars stop leak tablets...Is this true, i know it would probably stop the leak but didnt want a bandad on my new motor, and wasnt sure if that stuff will hurt my new oil cooler, so would be nice to get a few opinions on this, and what i should do, THANKS