If you have a Suzuki motorcycle, you might have noticed that it recommends you replace the coolant with “Suzuki super long life coolant”.
The benefit of this long-life coolant is that the replacement interval is twice as long.
Take for example the following two excerpts from the manuals. The first is from the Suzuki V-Strom 250, a 248cc small-capacity motorcycle, with the same engine as the basic commuter GW250 Inazuma.
The second is from the Suzuki V-Strom 1050XT, a premium adventure tourer.
In both examples, the recommendation is that you replace “super long life coolant” half as often (i.e. with twice the maintenance interval) as regular green “long life coolant”.
According to my research, the best alternatives are Zerex G30 or Nulon Blue Premium Long Life Coolant, depending on where you’re shopping (the US or Australia/NZ).
What is Suzuki Super Long Life Coolant?
Suzuki Super Long Life coolant is also branded “ECSTAR” sometimes. You can buy it as pre-mix or concentrate (to mix with distilled water).
It has a manufacturer part number of 990F0-59J44-EC1, 99000-99032-22X, or 99000-99032-20X, though sometimes that varies with the manual you’re consulting.
First, let’s get one thing out of the way: Apart from branding, color of coolant means nothing. Yes, Suzuki uses blue and green to distinguish between their own two types of coolant, but these colors come from dyes, not additives. They could have chosen red, or yellow, or nothing. And other brands of coolant that are blue aren’t necessarily the same as Suzuki blue coolant (though they might be).
According to the data sheet, Suzuki Super Long-life Coolant contains
- 48-53% water (purified). This conveys heat.
- 40-50% ethylene glycol. Ethylene glycol lowers the freezing point and raises the boiling point of water. It’s most effective at a 33-50% mix with water.
- Less than 5% organic acid salts (in unspecified proportion). These are corrosion inhibitors.
- Less than 3% of diethylene glycol. This is a by-product of ethylene glycol production and serves no specific purpose.
What do these mean? Basically, Suzuki Super Long life Coolant is, like every other coolant, simply ethylene glycol mix with some organic additives to prevent corrosion.
About OAT coolants
Suzuki Super Long Life Coolant is phosphate, silicate, borate, and nitrite free; i.e. it’s an Organic Acid Technology or OAT coolant.
The way inorganic salts inhibit corrosion is by depositing themselves on metallic surfaces and preventing oxidation. So they “deplete” over time, leading to shorter (2-year) replacement intervals.
Organic corrosion inhibitors have a very low depletion rate. The inhibitors form a single molecule layer on the metal surface only at anodic sites where there’s a risk of corrosion. They deplete almost not at all, which gives OAT coolants a long service life of four to eight years, or even “permanent” according to some manufacturers.
Alternative OAT coolants instead of Suzuki Super Long Life Coolant
Two easy-to-obtain OAT coolants are Zerex G30 or Nulon Blue Premium Long Life Coolant.
Option 1: Zerex G30
A good coolant alternative to Suzuki Super Long Life Coolant is Valvoline Zerex G30.
According to Valvoline’s website:
Valvoline™ ZEREX™ G30™ Antifreeze / Coolant is a premium carboxylate formulation. It incorporates state-of-the-art organic acid technology in an ethylene glycol base for protection of all cooling system metals including aluminum.Valvoline website
It meets the silicate-free requirements of the Japanese automobile manufacturers and phosphate-free requirements of European automobile manufacturers.
… Contains no phosphates, silicates, borates, nitrates, amines and nitrites
This is the same spec as Suzuki Super Long Life Coolant — an OAT coolant that’s based on ethylene glycol and that doesn’t contain the same harmful salts.
Note: Color of coolant doesn’t matter. The color of a coolant (pink, blue etc.) is a branding exercise. Manufacturers do it with dyes to distinguish between brands and product lines. So it makes no difference if it’s blue, green, pink, etc.
Option 2: Nulon Blue Premium Long Life Coolant
In some geographies, Nulon products are more easily obtainable.
So Nulon Blue Premium makes a good candidate alternative to Suzuki Super Long Life Coolant (in fact, they say so themselves).
According to Nulon’s website:
Nulon Blue Premium Long Life Coolant 100% Concentrate (BLL) is Silicate, Borate and Phosphate free. Japanese vehicles require Silicate and Borate free coolant, while European vehicles require Phosphate free coolant.Nulon website
Nulon’s unique formula allows Nulon Blue Premium Long Life Coolant 100% Concentrate to be used as top up, service fill or dry fill in vehicles with blue coolant super long life technology.
Nulon Blue Premium Long Life Coolant 100% Concentrate uses the latest unique organic additives and full glycol content to provide excellent cooling system protection from corrosion and anti-freeze/anti-boil performance for the latest model vehicles using blue coolant technology.
The Nulon product is a concentrate, so needs to be diluted 50:50 with demineralised water.