Researching further the VW TL-774 C (G11) I found that it is an old VW coolant type, it was used in VW model years 1980-1997. It also meets the following manufacturer's specifications:

also inert to elastomeric seals and paint.recommended for all the cooling circuits in internal combustion engines, particularly MTU, MB (except EURO 6) and MAN systems.a “long-life” coolant fluid based upon monoethylene glycol containing no amines, nitrites or phosphates.Note sure how long this link will work, but here it is:įinol Premium HD4X R.T.U -37☌ Coolant for Cars and Trucks

So it does look like 'HD4X' may be a specification. So perhaps the 'HD4X' is some sort of specification too? If so it is either obscure or obsolete, since I don't see it referenced – especially in North America.įinally I got a break – I found Finoil HD4X coolant. There are green, blue, red, turquoise, yellow, pink, violet, orange, purple coolants. And these additive packages are crucial - they are what is supposed to stop corrosion in your cooling system.Įach major engine manufacturer, and each aftermarket coolant manufacturer set and publish a multitude of coolant specifications.Ĭolours are a joke – they depend on whatever colour scheme given coolant manufacturer chooses to follow. They all – by design - may or may not contain silicates, borates, nitrites, nitrates, amines, phosphates, 2-EHA etc. What they differ in are additive packages. They all mostly contain 50% solution of ethylene glycol in water. There are at least 5 different varieties of HOAT coolants, probably more. Pretty random stuff, lacking any concrete connection to Triumph coolant. Taking a quick look at many motorcycle forums only amplifies this confusion. since most motorcycle dealerships sell Japanese motorcycles.and, as you will see below, a Japanese motorcycle compatible coolant may not be a good choice for a Triumph. If a motorcycle dealer, they will likely recommend a Japanese motorcycle compatible coolant. They all will most likely recommend you a random HOAT coolant they carry which may or may not be correct or compatible with what Triumph originally filled your cooling system with. Most auto parts stores have never heard of Triumph coolant specifications, or about 'HD4X coolant'. If you live in the UK and like shopping at the Triumph dealer you can probably easily purchase the Triumph branded product and not bother reading below and leaving snarky comments about how unnecessary this thread is -)īut if you are one of the many Triumph owners who is not in the UK (or Europe), you may find that many motorcycle dealers do not carry the Triumph coolant (even if they sell Triumph motorcycles). Specifications page lists “Coolant: Triumph HD4X Hybrid OAT (premixed) My owners handbook (2017 Street Scrambler) calls for “a year round, Hybrid Organic Acid Technology (known as hybrid OAT or HOAT) coolant (.) It is coloured green, contains 50% solution of ethylene glycol based antifreeze, has a freezing point of -35C. What exactly is the coolant Triumph puts in its engines in the factory, and later wants us to use? You put whatever you want into your engine ***Note: This is purely result of my own research, I do not guarantee that any of it is correct.

Oat coolant