1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

anti-freeze

Discussion in 'Car Repairs / Maintenance' started by norseman, 30 Oct 2018.

  1. norseman

    norseman

    Joined:
    2 Oct 2016
    Messages:
    83
    Thanks Received:
    5
    Location:
    Essex UK
    Country:
    United Kingdom
    Sorry if this query has been raised before (never have much success with a search facility) but can OAT (red) antifreeze be safely mixed with the existing BLUE A/F already in our cars? One has an all-alloy engine, the other an iron block & alloy head.
    Thanks for any replies.
     
  2. Motman

    Motman

    Joined:
    27 Feb 2017
    Messages:
    1,765
    Thanks Received:
    230
    Location:
    Essexshire
    Country:
    United Kingdom
    No. Drain it out, give it a few flushes and fill with fresh.
     
  3. Burnerman

    Burnerman

    Joined:
    7 Feb 2008
    Messages:
    18,686
    Thanks Received:
    3,617
    Location:
    Northumberland
    Country:
    United Kingdom
    Personally Id change the antifreeze for the red stuff.....its not supposed to mix and the corrosion inhibitors are compromised. It also lasts much longer. Do the same to both vehicles if you can, and then you just need one top up solution.
    John :)
     
  4. norseman

    norseman

    Joined:
    2 Oct 2016
    Messages:
    83
    Thanks Received:
    5
    Location:
    Essex UK
    Country:
    United Kingdom
    Sod it, bought the stuff for topping up & didn't think of checking the label. I'll take it back & exchange for the blue which will suffice until the cars need a coolant change.
    Thanks for the replies folks.
     
  5. Avocet

    Avocet

    Joined:
    30 Dec 2008
    Messages:
    706
    Thanks Received:
    101
    Location:
    Cumbria
    Country:
    United Kingdom
    As has been said, no, they don't mix. Also, the colour isn't an infallible guide as some manufacturers have their own colour (green in sme Nissans, for example). The basic antifreeze is the same ethylene glycol, but the additive packages vary (including the dyes that they use). Mixing the two used to form a dreadful sludge, hence the requirements to flush several times, but I think in recent years, that's not so much of an issue. Protection will be compromised, however. If your cooling system has any "yellow metals" in it (most likely copper or brass), you shouldn't use the newer "OAT" stuff.
     
  6. norseman

    norseman

    Joined:
    2 Oct 2016
    Messages:
    83
    Thanks Received:
    5
    Location:
    Essex UK
    Country:
    United Kingdom
    Thank you Avocet.
     
Loading...

Share This Page