i love the slant and they are reliable but some claim they are bullit proof which they are not , i seen way more windowed slants than i ever seen 6 cyl Fords or Chevs .
Nothing can run without oil or water very long. Abuse will kill anything. Slants are pretty well know for throwing the #5 rod for "whatever" the reason is. I think doing a few oil mods and running a high pressure spring in the pump helps with that.