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Fully Synthetic Engine Oil

Fully Synthetic Engine Oil

10K Boost: Premium Engine Additives for Power & Longevity

10K Boost offers a high-performance range of engine additives, cleaners, and treatments, including top-rated product like the 10K Boost Mass Air Flow (MAF) Sensor Cleaner. Known for its reliable engine protection, deposit removal, and performance restoration, 10K Boost is trusted by car enthusiasts and mechanics who demand long-term engine health and fuel efficiency. With Granville Oil & Chemicals precision formulation and quality assurance, you’re guaranteed top-tier lubricant additive innovation. Enjoy fast next-day delivery (on qualifying orders) and a satisfaction guarantee that makes 10K Boost both affordable and dependable. Every application delivers smoother running, reduced wear, and consistent power.

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Fully synthetic engine oil is engineered rather than simply refined, giving it more consistent protection across a wider temperature range than mineral or semi-synthetic alternatives. At FIXRA, we stock fully synthetic oil from Castrol, Shell, Mobil, Comma, Granville, FUCHS, Liqui Moly, and Valvoline, in every grade commonly specified for UK vehicles.

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Granville Hypalube C3 Engine Oil 5W-30 5L
Granville
Granville Hypalube C3 Engine Oil 5W-30 5L

Item number: 0527

£26.89
£26.89
£26.89
Mobil Super 3000 XE Engine Oil 5W-30 EU-SW
Mobil Super 3000 XE Engine Oil 5W-30 EU-SW
Mobil
Mobil Super 3000 XE Engine Oil 5W-30 EU-SW

Item number: 203218

From £9.59
From £9.59
From £9.59
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 £9.29
From £9.29
From £9.29
Mobil Super 3000 X1 Formula-FE Engine Oil 5W-30 EU-SW 5L
Mobil Super 3000 X1 Formula-FE Engine Oil 5W-30 EU-SW 5L
Mobil
Mobil Super 3000 X1 Formula-FE Engine Oil 5W-30 EU-SW 5L

Item number: 203216

£41.99
£41.99
£41.99
Fuchs Titan Gt1 Pro C-3 5W-30 5L
FUCHS
Fuchs TITAN GT1 PRO Engine Oil C-3 5W-30 5L

Item number: 602015891

£45.79
£45.79
£45.79
Granville Hypalube C2 Engine Oil 5W-30 5L
Granville
Granville Hypalube C2 Engine Oil 5W-30 5L

Item number: 0705

£28.49
£28.49
£28.49
Granville
Granville Hypalube C2/C3 Engine Oil 5W-30 5L

Item number: 0826

£25.89
£25.89
£25.89
Granville Hypalube C1 Engine Oil 5W-30 5L
Granville
Granville Hypalube C1 Engine Oil 5W-30 5L

Item number: 0672

£28.49
£28.49
£28.49
Granville Hypalube PD Engine Oil 5W-40 5L
Granville
Granville Hypalube PD Engine Oil 5W-40 5L

Item number: 0861

£29.49
£29.49
£29.49
Triple R 5w30 C2/C3 R-Tec 44 5 Litre
Triple R 5w30 C2/C3 R-Tec 44 5 Litre
Carlube
Triple R Engine Oil 5w30 C2/C3 R-Tec 44 5 Litre

Item number: KFO005

£26.09
£26.09
£26.09
Granville Engine Oil 5W-30 Hypalube VL FS 5L
Granville
Granville Engine Oil 5W-30 Hypalube VL FS 5L

Item number: 1128

£29.49
£29.49
£29.49
Granville Hypalube FD Engine Oil 5W-30 5L
Granville
Granville Hypalube FD Engine Oil 5W-30 5L

Item number: 0198

£29.09
£29.09
£29.09
Fuchs Titan Gt1 Flex C23 5W-30 5L
FUCHS
Fuchs Titan Gt1 Flex Premium Performance Engine Oil C23 5W-30 5L

Item number: 602015860

£42.89
£42.89
£42.89
Mobil 1 FS Engine Oil 0W-40 5L
Mobil 1 FS Engine Oil 0W-40 5L
Mobil
Mobil 1 FS Engine Oil 0W-40 5L

Item number: 157717

£79.49
£79.49
£79.49
Comma X-Flow Type V 5W-30 5L
Comma
Comma X-Flow Synthetic Engine Oil Type V 5W-30 5L

Item number: XFV5L

£36.09
£36.09
£36.09
Castrol Magnatec Stop-Start Synthetic Engine Oil 5W-30 C3 1L
Castrol
Castrol Magnatec Diesel Engine Oil Stop-Start Synthetic 5W-30 C3 1L

Item number: 15F929

£14.59
£14.59
£14.59
Comma X-Flow Type PD 5W-40 5L
Comma
Comma X-Flow Synthetic Engine Oil Type PD 5W-40 5L

Item number: XFPD5L

£35.09
£35.09
£35.09
Liqui Moly Engine Oil Molygen New Generation 5W-30 DPF 4L
Liqui Moly
Liqui Moly Engine Oil Molygen New Generation 5W-30 DPF 4L

Item number: 21225

£44.39
£44.39
£44.39
Mobil 1 ESP Engine Oil 5W-30 1L
Mobil
Mobil 1 ESP Engine Oil 5W-30 1L

Item number: 154282

£18.49
£18.49
£18.49
Comma X-Flow Type Z 5W-30 5L
Comma
Comma X-Flow Synthetic Engine Oil Type Z 5W-30 5L

Item number: XFZ5L

£34.99
£34.99
£34.99
Granville Hypalube C3 Fully Synthetic 5W/30 1 Litre
Granville
Granville Hypalube C3 Fully Synthetic Engine Oil 5W/30 1 Litre

Item number: 0526

£7.98
£7.98
£7.98
Granville 0W/30 FS-FX Fully Synthetic Engine Oil 5 Litre
Granville
Granville 0W/30 FS-FX Fully Synthetic Engine Oil 5 Litre

Item number: 0866

£38.64
£38.64
£38.64
Fuchs Titan Gt1 Flex 5 0W-20 5L
FUCHS
Fuchs Titan Engine Oil Gt1 Flex 5 0W-20 5L

Item number: 602014078

£57.09
£57.09
£57.09
Liqui Moly Engine Oil Molygen New Generation 5W-30 DPF 1L
Liqui Moly
Liqui Moly Engine Oil Molygen New Generation 5W-30 DPF 1L

Item number: 21224

£12.79
£12.79
£12.79
Comma X-Flow Type P 5W-30 5L
Comma
Comma X-Flow Synthetic Engine Oil Type P 5W-30 5L

Item number: XFP5L

£33.79
£33.79
£33.79
FUCHS Titan Supersyn F Eco-dt 5w-30 5L
FUCHS Titan Supersyn F Eco-dt 5w-30 5L
FUCHS
FUCHS Titan Supersyn F ECO-DT Engine Oil 5w-30 5L

Item number: 602420374

£34.99
£34.99
£34.99
Valvoline Synpower Xl-III C3 5W30 1L
Valvoline
Valvoline Synpower Synthetic Engine Oil Xl-III C3 5W30 1L

Item number: 872372

£12.39
£12.39
£12.39
Comma X-Flow Type G 5W-40 5L
Comma
Comma X-Flow Synthetic Engine Oil Type G 5W-40 5L

Item number: XFG5L

£32.19
£32.19
£32.19
Fuchs Titan Sintopoid Fe 75W-85 1L
Fuchs Titan Sintopoid Fe 75W-85 1L
FUCHS
Fuchs Titan Sintopoid FE Engine Oil 75W-85 1L

Item number: 602010551

£14.79
£14.79
£14.79
Granville 0W/20 FS-E Fully Synthetic Engine Oil 5 Litre
Granville
Granville 0W/20 FS-E Fully Synthetic Engine Oil 5 Litre

Item number: 0694

£38.98
£38.98
£38.98

For most modern cars, a synthetic oil is not an upgrade but a requirement. Extended service intervals, turbocharging, direct injection, and emissions equipment all place demands on the oil that a conventional formulation struggles to meet.

Shop fully synthetic oil by grade

Choose the viscosity your manufacturer specifies:

Shop fully synthetic oil by brand

Our range spans premium and value brands alike, so you can match specification to budget. Browse Castrol oil, Shell oil, Mobil oil, Comma oil, and more.

What is fully synthetic oil?

Fully synthetic oils are built from engineered base stocks with a uniform molecular structure, rather than refined directly from crude. That uniformity delivers better resistance to heat and oxidation, improved cold-start flow, and a longer service life before the oil degrades.

What is the difference between synthetic and fully synthetic oil?

The terms are used loosely across the industry. "Semi-synthetic" or "synthetic blend" products mix synthetic and mineral base oils, offering some of the benefits at a lower price, while fully synthetic contains no conventional mineral base stock. If your handbook specifies fully synthetic, a blend is not an equivalent substitute.

Shop synthetic engine oil at FIXRA with free delivery on orders over £20 and next-day delivery options, plus 60-day returns and Click & Collect at your nearest parcel shop.