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5W-40 Fully Synthetic Engine Oil

5W-40 Fully Synthetic Engine Oil

Our 5W-40 fully synthetic oil range is built for engines that work hard. Fully synthetic base oils resist thermal breakdown better than mineral or semi-synthetic alternatives, which makes them a common choice for turbocharged petrol engines, high-mileage diesels and performance cars. Enter your registration to check which fully synthetic 5W-40 engine oil suits your vehicle.

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Mobil Super 3000 X1 Engine Oil 5W-40 EU-SW
Mobil Super 3000 X1 Engine Oil 5W-40 EU-SW
Mobil
Mobil Super 3000 X1 Engine Oil 5W-40 EU-SW

Item number: 157301

From £10.79
From £10.79
From £10.79
Granville Hypalube PD Engine Oil 5W-40 5L
Granville
Granville Hypalube PD Engine Oil 5W-40 5L

Item number: 0861

£36.89
£36.89
£36.89
Liqui Moly Engine Oil 5W-40 New Generation Molygen 5L
Liqui Moly
Liqui Moly Engine Oil 5W-40 New Generation Molygen 5L

Item number: 8536

£67.59
£67.59
£67.59
Comma X-Flow Type PD 5W-40 5L
Comma
Comma X-Flow Synthetic Engine Oil Type PD 5W-40 5L

Item number: XFPD5L

£54.39
£54.39
£54.39
Comma X-Flow Type G 5W-40 5L
Comma
Comma X-Flow Synthetic Engine Oil Type G 5W-40 5L

Item number: XFG5L

£52.79
£52.79
£52.79
Shell Helix Ultra 5W-40 5L
Shell
Shell Helix Ultra Synthetic Motor Engine Oil 5W-40 5L

Item number: 550052838

£58.52
£58.52
£58.52
Comma X-Flow Type LL 5W-30 5L
Comma
Comma X-Flow Synthetic Engine Oil Type LL 5W-30 5L

Item number: XFLL5L

£52.29
£52.29
£52.29
Comma PMO Syner-G 5W-40 5L
Comma
Comma Syner-G Synthetic Engine Oil 5W-40 5L

Item number: SYN5L

£65.79
£65.79
£65.79
Castrol Magnatec 5w-40 DPF- 1L
Castrol
Castrol Magnatec Engine Oil 5w-40 DPF- 1L

Item number: 15F90C

£13.29
£13.29
£13.29
Comma X-Flow Type G 5W-40 1L
Comma
Comma X-Flow Synthetic Engine Oil Type G 5W-40 1L

Item number: XFG1L

£12.49
£12.49
£12.49
Comma PMO Motorsport 5W-50 5L
Comma
Comma Motorsport Fully Synthetic Engine Oil 5W-50 5L

Item number: MS5L

£60.19
£60.19
£60.19
Valvoline Synpower Motor Oil SAE 5W-40 5 Litres
Valvoline
Valvoline Synpower Motor Engine Oil SAE 5W-40 5 Litres

Item number: 872382

£40.81
£40.81
£40.81
Comma X-Flow Type G 5W-40 20L
Comma
Comma X-Flow Synthetic Engine Oil Type G 5W-40 20L

Item number: XFG20L

£168.89
£168.89
£168.89
Castrol Edge Engine Oil 5W-40 1L
Castrol
Castrol Edge Engine Oil 5W-40 1L

Item number: 15F7D5

£15.29
£15.29
£15.29
Fuchs Titan Supersyn 5w-40 5L
Fuchs Titan Supersyn 5w-40 5L
FUCHS
Fuchs Titan Engine Oil Supersyn 5w-40 5L

Item number: 602197351

£43.69
£43.69
£43.69
Shell Engine Oil 5W-40 Helix Ultra 1L
Shell
Shell Engine Oil 5W-40 Helix Ultra 1L

Item number: 550052677

£13.69
£13.69
£13.69

Where a synthetic 5W-40 oil differs from the wider grade is in the base stock. Synthetic molecules are more uniform, so the oil holds its viscosity for longer under heat and shear, keeps deposits in check, and copes better with extended drain intervals. That matters most on engines running high cylinder pressures or long motorway miles.

Shop 5W-40 by formulation

Browse our fully synthetic engine oil range to see all the grades we stock, or shop the 5W-40 engine oil collection for the full grade without a formulation filter. If you're comparing formulations, you can also explore our semi-synthetic oil and mineral engine oil ranges.

Shop 5W-40 fully synthetic oil by pack size

A 1 litre bottle covers top-ups between services, while 5 litre containers are usually the sensible choice for a full drain and refill on a family car. See our 5 litre 5W-40 engine oil and 1 litre engine oil collections for the pack size you need.

What specifications does 5W-40 fully synthetic oil meet?

ACEA A3/B4 is the specification most often associated with 5W-40 fully synthetic engine oil, and approvals such as MB 229.51 and VW 502.00/505.00 are common on this grade. Some 5W-40 products are also blended for wet-clutch motorcycle use to JASO MA. Always check your handbook or use our oil finder before you buy.

Buy 5W-40 fully synthetic oil at FIXRA

Shop engine oil from top brands including Castrol, Shell, Mobil, Comma, FUCHS, Liqui Moly, Valvoline and Granville. Orders over £25 qualify for free delivery, next-day delivery options are available, and every order is covered by our 60-day returns policy. Click & Collect at a local parcel shop is available too.