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Semi-Synthetic Engine Oil

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Semi-Synthetic Oil

Semi-synthetic oil blends mineral base oil with synthetic base stock, giving better protection than a straight mineral lubricant at a lower cost than a fully synthetic product. That balance makes semi-synthetic engine oil a popular choice for older engines, higher-mileage cars, and motorcycles. Use our reg lookup to check whether a semi-synthetic oil suits your vehicle.

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Granville Hypalube Engine Oil 10W-40 5L
Granville
Granville Hypalube Engine Oil 10W-40 5L

Item number: 0123

£32.09
£32.09
£32.09
Granville Hypalube SL Engine Oil 5W-30 5L
Granville
Granville Hypalube SL Engine Oil 5W-30 5L

Item number: 0435

£33.79
£33.79
£33.79
Liqui Moly Engine Oil Top Tec 4200 5W-30 1L
Liqui Moly
Liqui Moly Engine Oil Top Tec 4200 5W-30 1L

Item number: 8972

£17.29
£17.29
£17.29
Comma X-Flow Type F 5W-30 5L
Comma
Comma X-Flow Semi Synthetic Engine Oil Type F 5W-30 5L

Item number: XFF5L

£44.59
£44.59
£44.59
Comma PMO Eurolite 10W-40 5L
Comma
Comma PMO Eurolite Semi Synthetic Engine Oil 10W-40 5L

Item number: EUL5L

£51.99
£51.99
£51.99
Comma PMO Eurolite 10W-40 1L
Comma
Comma PMO Eurolite Semi Synthetic Engine Oil 10W-40 1L

Item number: EUL1L

£9.69
£9.69
£9.69
Castrol Power 1 Scooter 2T Motor Oil 1L
Castrol Power 1 Scooter 2T Motor Oil 1L
Castrol
Castrol Power 1 Scooter 2T Motor Engine Oil 1L

Item number: 14E960

£19.89
£19.89
£19.89
Shell Helix Semi Synthetic Engine Oil HX7 5W-40 1L
Shell
Shell Helix Semi Synthetic Engine Oil HX7 5W-40 1L

Item number: 550046275

£12.29
£12.29
£12.29
Castrol Power 1 4T Engine Oil 10W-40 1L
Castrol
Castrol Power 1 4T Engine Oil 10W-40 1L

Item number: 15043E

£17.19
£17.19
£17.19
Shell Helix Engine Oil HX5 15W-40 5L
Shell
Shell Helix Engine Oil HX5 15W-40 5L

Item number: 550039863

£62.69
£62.69
£62.69
LIQUI MOLY MOS2 LEICHTLAUF 10W-40 5L
LIQUI MOLY MOS2 Leichtlauf 10W-40 5L
Liqui Moly
LIQUI MOLY MOS2 Leichtlauf 10W-40 5L

Item number: 2184

£54.09
£54.09
£54.09
Castrol POWER1 2T 2-Stroke Engine Oil 1L
Castrol
Castrol POWER1 2T 2-Stroke Engine Oil 1L

Item number: 15F576

£17.19
£17.19
£17.19
Comma X-Flow Type XS 10W-40 5L
Comma
Comma X-Flow Semi Synthetic Engine Oil Type XS 10W-40 5L

Item number: XFXS5L

£38.69
£38.69
£38.69
Shell Engine Oil 10W-40 Helix HX7 1L
Shell
Shell Engine Oil 10W-40 Helix HX7 1L

Item number: 550053736

£16.39
£16.39
£16.39
Shell Helix Engine Oil HX7 10W-40 5L
Shell
Shell Helix Engine Oil HX7 10W-40 5L

Item number: 550053738

£45.19
£45.19
£45.19
Shell Advance VSX Motorcycle Oil 2T 1L
Shell
Shell Advance VSX Motorcycle Engine Oil 2T 1L

Item number: 550027083

£14.69
£14.69
£14.69
Silverhook 2 Stroke Engine Oil 1L
Silverhook
Silverhook 2 Stroke Engine Oil 1L

Item number: SHTT1

£5.19
£5.19
£5.19
Silverhook Oil 10W-40 Excel Semi Sm/ch-4 1L
Silverhook
Silverhook Oil 10W-40 Excel Semi Synthetic Engine Oil Sm/ch-4 1L

Item number: SHLK2

£4.69
£4.69
£4.69
Mobil Super 2000 X1 Engine Oil 10W-40 EU-SW 5L
Mobil Super 2000 X1 Engine Oil 10W-40 EU-SW 5L
Mobil
Mobil Super 2000 X1 Engine Oil 10W-40 EU-SW 5L

Item number: 202211

£29.59
£29.59
£29.59
Mobil Super 2000 X1 Engine Oil 10W-40 1L
Mobil
Mobil Super 2000 X1 Engine Oil 10W-40 1L

Item number: 151188

£8.49
£8.49
£8.49

A semi-synthetic engine oil (sometimes called part-synthetic) typically carries a smaller proportion of synthetic base oil, which lifts its resistance to heat and oxidation above a mineral oil without matching a fully synthetic product. For many everyday engines on standard service intervals, that is exactly the right level of protection.

Shop semi-synthetic oil by grade

Semi-synthetic blends are most common in the thicker multigrades. Browse 10W-40 engine oil and 15W-40 engine oil for the grades where semi-synthetic is the norm, or 5W-30 engine oil and 20W-50 engine oil for lighter and heavier options. We also stock 2-stroke oil for compatible motorcycles and other two-stroke applications.

What is the difference between semi-synthetic and fully synthetic oil?

The difference is the base oil. Fully synthetic products are built from chemically engineered base stocks and hold their viscosity better under extremes of heat and cold, which supports longer drain intervals. Semi-synthetic oils use a mineral and synthetic mix, so they cost less but need changing more often. Never step down from a fully synthetic specification to a semi-synthetic one without checking your handbook.

Can I use semi synthetic oil in a motorcycle?

Many four-stroke motorcycles run happily on a semi-synthetic 10W-40, provided the oil carries a JASO MA rating suitable for wet clutches. Motor oils with friction modifiers can cause clutch slip, so the JASO marking matters. Check your bike’s manual before topping up.

Buy semi synthetic oil at FIXRA

Browse the full engine oil range or shop by brand, including Comma, Castrol and Granville. Orders over £25 qualify for free delivery, next-day delivery options are available, and you have 60 days to return anything that isn’t right. Click & Collect at your nearest parcel shop is also available.