![]() Hope the tech you talked to confused this with another type in their lineup as thousands of diesel owners switched to this one because it contains no silicates. Unless they have other elc coolants or have recently changed their recipe for the zxed1. Some may be orange while others may be dyed blue or purple." These extended-life coolants only differ in colour. In recent years, anti-freeze manufacturers have been creating universal antifreeze that can be used with all vehicle types. A HOAT coolant will need to be changed every five years or 150,000 miles. HOAT anti-freezes are used by many European car manufacturers, although they are also used by American companies such as Chrysler and Ford. These antifreeze use organic acids but not 2-EHA and usually include silicates to provide protection for aluminium surfaces. They must be changed once every five years or 150,000 miles. ![]() Usually, OAT-based coolants will be dyed a different colour to green anti-freeze. Unlike green anti-freeze, they generally do not contain silicates or phosphates. OAT stands for Organic Acid Technology.OAT anti-freeze contain ingredients such as 2-EHA, sebacate and other various organic acids. ![]() They need to be changed every 30,000 miles or once every two to three years. Their silicate and phosphate composition provides protection for aluminium and bare iron surfaces. These are the traditional type of anti-freeze most commonly used in North America. There are only 3 main anti-freeze types/coolant types, at most 4 so far less than the types of car engines ! Here is just a little info that I just quickly found. I asked about silicates in the ELC and surprisingly he did mention it did have them without going into much detail.Unless they have other elc coolants or have recently changed their recipe for the zxed1. I called Valvoline today out of curiosity, the tech mentioned only their Zerex Asian formula line would be recommended for Toyota/Lexus. I find it comparable but not much cheaper than Toyota pink super long life coolant. Otherwise, the Zerex Asian formula is a no brainer at 5year/150k mile intervals. You can call Valvoline from their site to verify. I could be wrong but i think it may contain silicates which is not recommended by Toyota/Lexus. I probably will not be doing this until late April so I have plenty of time to do more research and that is why I'm here asking ahead of time.Zerex ZXED1 Cat EC-1 ELC is speced for diesel applications. If anyone has any data on why this Zerex would be a bad choice please point it out. It is Zerex ZXED1 Cat EC-1 ELC and cost about $16 per gallon. I have a 2006 ford diesel that I switched to zerex elc years back and ford recomended their own gold coolant that has caused many engine issues because of silicates in the gold, so far zerex has done it's job on the $60k truck and really am considering using it in this old rx as well as it contains no silicates. I think that I am going to be using either zerex elc or peak final charge elc.
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