Aspen 2 is premixed at 50:1 also referred to as 2% (100ml 2-stroke oil added to 5 litres fuel)

Aspen 2 uses the most superior, fully synthetic, 2-stroke oil on the market which is also biodegradable. If your machine requires a different ratio, you have a few options to reach that with Aspen fuel. Here is a guide to help you. 

Using Aspen 2 (Red can) – you can add additional oil. For example:

Mixing 5 litres:

  • adding an additional 100ml to a 5 litre can = 25:1 or 4%
  • add an additional 25ml to a 5 litre can = 40:1

Mixing 1 litre

  • adding an additional 20ml to 1 litre Aspen = 25:1 or 4%
  • add an additional 5ml to 1 litre Aspen = 40:1


Using Aspen 4 (Blue can) you can add oil in the same way you would with regular fuel to reach your desired ratio. For example:

 Mixing 5 litres:

  • Add 100ml to a 5 litre can = 50:1
  • Add 125ml to a 5 litre can = 40:1
  • Add 200ml to a 5 litre can = 25:1

Mixing 1 litre

  • Add 20ml to 1 litre  = 50:1
  • Add 25ml to 1 litre  = 40:1
  • Add 40ml to 1 litre  = 25:1


If you have a water-cooled engine such as an outboard you need to use Aspen 4 and mix with a suitable 2-stoke outboard oil, as recommended by the engine manufacturer.

Tips for mixing:

  • Always use the best quality oil available. Low-cost 2-stroke oil usually relates to low quality, you get what you pay for when it comes to oils!
  • If you are mixing into a 5 litre Aspen can, clearly mark on the can your new ratio, you want to avoid using it in the wrong machine.
  • Be accurate with your measurements. Many people add a little extra oil to be “on the safe side” adding too much oil will make the machine emit more smoke and result in a dirtier exhaust port as the unburnt oil escapes through the exhaust.
  • Some manufactures will recommend 50:1 with a specific oil or 40:1 using another oil. This to cover the event of inaccurate mixing or using lower quality oil.
  • Shake the can after adding your oil to ensure an even mix.


Check out our additional guides for more information

Switching a machine from regular petrol to Aspen (it is not just for new machines). 

Switching back to regular petrol – Aspen is compatible with other petrol fuels, no machine adjustments needed.

If you have further questions please get in touch with us by emailing we will be happy to help.


To find out more about the benefits of using with Aspen fuel please visit the website.