Aspen 2 Alkylate Fuel (50:1, 5 L)
Ready-mixed 50:1 alkylate 2-stroke fuel with biodegradable oil — virtually free of benzene and aromatics, ethanol-free and slow to go stale.
In short:Aspen 2 is alkylate petrol premixed at 50:1 with a biodegradable two-stroke oil, sold for chainsaws, brush cutters, hedge trimmers and other land-based two-stroke engines. Aspen says it is virtually free of benzene, aromatic hydrocarbons and olefins and contains no ethanol, so it keeps far longer than pump petrol (Aspen UK quotes 3–5 years). It costs much more than home-mixed fuel but needs no mixing and gives cleaner exhaust.
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Pros
- Virtually free of benzene and aromatics — much cleaner exhaust
- No mixing — ready to pour at 50:1
- Ethanol-free, so it doesn't go stale in a seasonal machine
Cons
- Several times the cost of home-mixed fuel
- Only for engines that run 50:1 (check your manual)
- Amazon.co.uk listing unavailable in October 2026
Aspen 2 is alkylate petrol premixed at 50:1 with a biodegradable two-stroke oil, made for chainsaws, clearing saws, brush cutters and other land-based two-stroke engines. You pour it straight into the tank — no measuring, no mixing.
Why alkylate?
Aspen says its fuel is virtually free of benzene, aromatic hydrocarbons and olefins — the harmful components of ordinary petrol exhaust you breathe right next to a brush cutter’s engine. It also contains no ethanol, which is what makes pump petrol go stale and damage carburettor diaphragms in machines that sit for months (see ethanol petrol and brush cutters). Aspen UK quotes a storage life of 3–5 years.
Is it worth the price?
It costs several times more than home-mixed fuel. It makes the most sense if you use your machine occasionally (so fuel would otherwise sit and go stale), if you cut for long hours and care about the fumes, or if you want guaranteed correct mixing. Heavy users on a budget can mix their own with fresh E5 petrol and a good oil — see the best 2-stroke oil and fuel and the 2-stroke fuel ratio chart.
Important
Only use it in engines that run at 50:1 — check your manual. Four-stroke engines that take straight petrol need Aspen 4 instead; Stihl’s 4-MIX engines run on two-stroke mix. When we checked in October 2026, the Amazon.co.uk listing showed as unavailable, so check UK garden-machinery dealers.
More oil & fuel we cover
A 5 litre can of Motul's Garden 2T oil for mixing your own fuel — a good-value bulk choice for owners with several two-stroke garden machines.
- Type2-stroke oil for garden machinery
- Volume5 L (part 100047)
- Approvals (Motul Garden 2T range)API TC, ISO-L-EGD, JASO FD
A replacement air filter for Stihl FS 38, FS 45, FS 55, KM 55 and HL 45 machines, matching OEM part 4140 124 2800 — cheap routine servicing.
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- Listed forStihl FS 38, FS 45, FS 55, KM 55, HL 45
- MakePattern part (Jrisbo), not genuine Stihl
A low-cost gasket and diaphragm set for Walbro WA/WT-type carburettors (replaces D10-WTA, K10-WAT) — for rebuilding a leaking or poorly running carb.
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- Contents4 gaskets and diaphragms (listing)
A part-synthetic 2-stroke oil meeting JASO FD, ISO-L-EGD and API TC — a widely available, high-spec oil for mixing your own brush cutter fuel.
- TypePart-synthetic 2-stroke oil
- SpecificationsJASO FD, ISO-L-EGD, API TC
- Volume1 L