Fuel Cleanliness Codes – What do they mean?

Most of us that deal with fuel have heard of the “Worldwide Fuels Charter”, but do we know what the recommended ISO cleanliness code 18/16/13 actually means?.

Lets break it down into the three sections. 18 = means you can have up to 2,500 particulates larger than 4 micron per ml of fuel. 16 = means you can have up to 640 particulates larger than 6 micron per ml of fuel. 13 = means you can have up to 80 particulates larger than 14 micron per ml of fuel.

So we can see that the three codes are represented by 4 micron, 6 micron and 14 micron, which can be useful information when looking at engine maintenance etc.

However, are you aware that each increase in number actually doubles the amount of contamination you have in your fuel. So, moving the 4 micron code from 18 to 19 means you have up to 5000 particulates per ml of fuel, and code 20 = 10,000 particulates per ml of fuel.

We are commonly seeing codes of 20-22 at the 4 micron level being delivered as fresh fuel, can you afford to take the risk. Contact us at TankCare to find out more.