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Yes — 15W-40 remains the most common viscosity grade for heavy-duty diesel engines in plant, agricultural, and commercial applications, particularly older and mid-life equipment. Newer engines with tighter emissions controls (EGR, DPF, SCR) often specify lower-viscosity grades like 10W-40 or 5W-30 to support the after-treatment system. Always check the equipment handbook — running the wrong viscosity can affect oil pressure, wear, and emissions-system function.

Both matter — API is the American Petroleum Institute classification (e.g. CK-4, CJ-4, CI-4) and ACEA is the European Automobile Manufacturers Association classification (e.g. E7, E9, E11). Most heavy-duty diesel oils carry both. The classification on the bottle must meet or exceed the level specified in your equipment handbook — for example, an engine specifying API CJ-4 or higher will accept CK-4. Lower classifications must not be substituted as they may not protect the engine adequately or may damage the after-treatment system.

Match the OEM approval. Volvo engines typically require Volvo VDS-4 or VDS-4.5 approved oils. Mercedes engines require an MB-Approval (e.g. MB 228.31, MB 228.51, MB 235.27 depending on application). Shell Rimula, Castrol CRB, and Q8 T-series all carry the major OEM approvals at their flagship grades — check the product page for the specific approvals listed against each grade. WhatsApp 07754288583 with your engine model and we can confirm the right oil.

Unopened engine oil drums and barrels typically have a five-year shelf life when stored indoors at moderate temperatures. Once opened, use within two to three years. Avoid storing in direct sunlight, outdoors, or in environments with large temperature swings — base oils and additive packs can separate or oxidise. Pack sizes carry batch and date stamps; check these before adding old oil to a critical engine.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Engine Oil

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Engine Oil is the highest-volume sub-category within Oil, covering diesel engine oils for plant machinery, commercial vehicles, agricultural tractors, and off-highway equipment. Parts For Machines supplies heavy-duty engine oils across viscosity grades and OEM specifications, in pack sizes from 5-litre service packs through 20-litre drums to 208-litre barrels. Common viscosity grades in this range include 10W-40, 15W-40, and 20W-50 — 15W-40 is the workhorse grade for most heavy-duty diesel applications across the UK climate band.

Lower viscosity grades (5W-30, 10W-30) are used where modern emission systems and start-stop demands require lighter base oils. Engine oils carry industry classifications including API CK-4 / CJ-4 / CI-4, ACEA E7 / E9 / E11, and OEM approvals such as Volvo VDS-4.5, MB 228.31, Cummins CES 20086, Mack EOS-4.5, and similar. Parts For Machines is an Authorised Distributor and Seller of Shell, Castrol, and Q8 across engine oils.

Shell Rimula is the main heavy-duty diesel engine oil line, with R3, R4, R5, and R6 grades covering progressively more demanding applications. Castrol CRB is the heavy-duty diesel range, including CRB Multi 15W-40 and CRB Plus 15W-40 for fleet use. Q8 T 800 and T 900 series cover heavy-duty diesel applications across viscosity grades, with OEM approvals matching most modern truck, bus, and plant engines.

Match the specification on the bottle to the requirement in your equipment handbook — the API service classification, ACEA performance class, and OEM approval together define whether the oil is suitable. Product pages list all approvals carried by each grade, plus the typical drain interval supported. Bulk and pallet pricing applies on volume — contact the team for a quote on multi-drum or pallet orders.

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FAQs

Yes — 15W-40 remains the most common viscosity grade for heavy-duty diesel engines in plant, agricultural, and commercial applications, particularly older and mid-life equipment. Newer engines with tighter emissions controls (EGR, DPF, SCR) often specify lower-viscosity grades like 10W-40 or 5W-30 to support the after-treatment system. Always check the equipment handbook — running the wrong viscosity can affect oil pressure, wear, and emissions-system function.

Both matter — API is the American Petroleum Institute classification (e.g. CK-4, CJ-4, CI-4) and ACEA is the European Automobile Manufacturers Association classification (e.g. E7, E9, E11). Most heavy-duty diesel oils carry both. The classification on the bottle must meet or exceed the level specified in your equipment handbook — for example, an engine specifying API CJ-4 or higher will accept CK-4. Lower classifications must not be substituted as they may not protect the engine adequately or may damage the after-treatment system.

Match the OEM approval. Volvo engines typically require Volvo VDS-4 or VDS-4.5 approved oils. Mercedes engines require an MB-Approval (e.g. MB 228.31, MB 228.51, MB 235.27 depending on application). Shell Rimula, Castrol CRB, and Q8 T-series all carry the major OEM approvals at their flagship grades — check the product page for the specific approvals listed against each grade. WhatsApp 07754288583 with your engine model and we can confirm the right oil.

Unopened engine oil drums and barrels typically have a five-year shelf life when stored indoors at moderate temperatures. Once opened, use within two to three years. Avoid storing in direct sunlight, outdoors, or in environments with large temperature swings — base oils and additive packs can separate or oxidise. Pack sizes carry batch and date stamps; check these before adding old oil to a critical engine.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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