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Thread: What Coolant red or blue for 1998 D1 300tdi?

  1. #11
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    You have to run Tectaloy Extra Cool Gold green Glycol coolant,I've been running it in my Tdi for 7 years,DO NOT run Red or Blue OAT in your engine.The answer is very simple,Green Glycol coolant. Pat

  2. #12
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    Brand is almost irrelevant , suffice to say give the system a good flush and use a good brand of green glycol based coolant - its really not that difficult.
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  3. #13
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    Quote Originally Posted by loanrangie View Post
    Brand is almost irrelevant , suffice to say give the system a good flush and use a good brand of green glycol based coolant - its really not that difficult.
    As per my earlier post, virtually all coolants are glycol based, the glycol gives the anti-freeze anti-boil characteristics.
    OAT is the anti-corrosion additive (Organic Acid Technology).
    Colour doesn't determine the anti-corrosion additive although 'typically' green is IAT/CAT but it isn't a given.

    Contact the supplier and ideally get their answer in writing (by email).


    Colin
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  4. #14
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    Quote Originally Posted by gromit View Post
    As per my earlier post, virtually all coolants are glycol based, the glycol gives the anti-freeze anti-boil characteristics.
    OAT is the anti-corrosion additive (Organic Acid Technology).
    Colour doesn't determine the anti-corrosion additive although 'typically' green is IAT/CAT but it isn't a given.

    Contact the supplier and ideally get their answer in writing (by email).


    Colin
    As long as he doesnt mix different coolants he will be fine, but from all the info gathered here i would not use OAT in a TDI.
    MY08 TDV6 SE D3- permagrin ooh yeah
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  5. #15
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    Just to throw a spanner in the works, the LAME who supervises the maintenance of the tanks in our Club has removed all glycol based coolants from them. They (including the LAME's D1) now have demineralised water and a sacrificial anode.

  6. #16
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    Quote Originally Posted by loanrangie View Post
    but from all the info gathered here i would not use OAT in a TDI.
    amen to that...

    anything 300tdi is designed to use a gylcol based coolant and i have yet to see anything that would suggest to me that there is an advantage in using something else...

    not just the engine and cooling system but the instruments are calibrated for glycol based coolants.
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  7. #17
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    My understanding of the issue involved is that OAT attacks brass/ copper radiators.
    Does a 98 D1 have a brass or aluminium radiator?

    Red OAT is fine with aluminium radiators. I must say although the stuff initially leaks at every joint when hoses are changed , but in my case settled down.

    I was very impressed that my 12 year old original radiator is still going strong, and that could not be said of any RRC I had with a brass radiator.

    Although I had my 93 RRC rad rodded after 11 years after a recore with 2 year changes of Nulon Longlife green and it was still perfect.

    BTW the blue is usually to BMW or Honda spec and in Honda's case has a recommended 10 year change period.

    IMHO , demineralized water and sticking to the coolant replacement schedule are the keys to radiator life.
    Regards Philip A

  8. #18
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    Throwing more confusion into the equation is on castrols lube site they list OAT as recommended for the 300 TDi

    Radiator
    Service Refill Capacity: 11.7 Litres. See note 921 below.
    CASTROL RADICOOL SF-O
    Long-life coolant formulated using advanced organic acid technology (OAT). It is suitable for use in a wide range of vehicles, including cars, trucks and buses. It can be used in both petrol and diesel engines. Radicool SF-O works over a wide operating temperature range for effective engine cooling in all climates


  9. #19
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    Quote Originally Posted by incisor View Post
    amen to that...

    anything 300tdi is designed to use a gylcol based coolant and i have yet to see anything that would suggest to me that there is an advantage in using something else...

    not just the engine and cooling system but the instruments are calibrated for glycol based coolants.
    Glycol has nothing to do with the anti-corrosion package. 'OAT' coolant will contain glycol. I'm not sure how the instruments would be 'calibrated for glycol based coolants'.

    You need to find out what anti-corrosion method is used OAT, HOAT, IAT, CAT etc. etc. I think you mean traditional anti-corrosion additive (IAT or CAT depending on who you are talking to).
    It seems that type 2 OAT should OK but I'm sticking with conventional/traditional anti corrosion type coolants. There are a number of horror stories on the net about the early OAT coolants causing problems in older vehicles.

    I've used Shell anti-freeze anti-boil (the name has changed now) in my Defender since about 1998 but only found out a couple of years ago that it uses HOAT (Hybrid Organic Acid/Additive Technology) anti-corrosion. I also use it in the Series I without any problems.

    loanrangie makes a good point about not mixing coolant types.

    From my limited knowledge water allows better heat transfer than glycol, but the anti-freeze anti-boil properties of a percentage of glycol in the water possibly outweigh any heat transfer advantage.

    There is another option, just add an anti corrosion pack (I do this with all my Land Rovers that are awaiting restoration) . But off we go again trying to work out what anti-corrosion method is used because it isn't always stated on the container.



    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  10. #20
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    Quote Originally Posted by Roverlord off road spares View Post
    Throwing more confusion into the equation is on castrols lube site they list OAT as recommended for the 300 TDi

    Radiator
    Service Refill Capacity: 11.7 Litres. See note 921 below.
    CASTROL RADICOOL SF-O
    Long-life coolant formulated using advanced organic acid technology (OAT). It is suitable for use in a wide range of vehicles, including cars, trucks and buses. It can be used in both petrol and diesel engines. Radicool SF-O works over a wide operating temperature range for effective engine cooling in all climates
    Just checked in the shed and it was Castrol not Shell I've been using. The old Castrol anti-freeze anti-boil which was HOAT has been replaced by Castrol Radicool (not Radicool SF-0)


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

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