Not some much of a "How to", more a "What to".
O.A.T. CoolantThe Td5 Disco/Defender manuals stipulates you use an O.A.T. coolant.
Use Havoline Extended Life Coolant (XLC), or any ethylene glycol based anti-freeze (containing no methanol) with only Organic Acid Technology corrosion inhibitors, to protect the cooling system
As many know this isn't a readily available product and so we have to hunt around for a suitable alternative. The simple answer is CAT ELC (part no. 129-2151) or Caltex ELC.
The following is a summary of what I have uncovered regarding the elusive O.A.T. coolant.
Havoline XLC is manufactured by Texaco-Chevron
Caltex ELC is manufactured by Texaco-Chevron and can be substituted for CAT ELC.
The MSDS for all 3 products is the same.
In otherwords they are one and the same. This links is to the web site for Caltext ELC
http://www.caltex.com.au/products_special_detail.asp?id=318 Now in my case I could access the CAT ELC ($92 for 20L drum of Premix 50/50) without incurrring additional freight costs. The Caltex ELC should also be available to you and both are available in premix or concentrate form.
I hope this helps answer a few questions. Coolants aren't all the same, but there are also not that many varieties as you might think.
Oil Option (Mobil Delvac-1)This oil is one option for using in Td5 and Tdi motors. I don't use it at present, but Mobil lists it as an option for both engines. Interestingly Delvac-1 is a substitue for CAT ECF-1. All CAT oils in Australia are straight out of Mobil. Again this can be bought in 20L and 205L drums from CAT a lot cheaper than the Mobil.
