Forum Discussion

Grandpere's avatar
Grandpere
Explorer
Nov 01, 2014

Automotive vs. RV antifreeze

Can I use regular automotive antifreeze in the black and gray water tanks and sink traps or must I use the RV antifreeze? I am in NE AR and only blow out the water lines to winterize our MH.

43 Replies

  • Good grief you guys, he never said anything about putting it in his fresh water system.
    Putting a cup or two into the P traps and such is not a big deal and will work fine.
  • No! Auto antifreeze is toxic. RV antifreeze is designed for the water lines and is non-toxic. Never use automotive antifreeze in your water lines.
  • You will contaminate wherever you dump. It's poison. Please do not consider doing that.