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Match the coolant chemistry to the engine OEM specification. Traditional IAT (Inorganic Acid Technology) coolants — typically green or blue, contain silicate and phosphate inhibitors, used on older engines and many plant/agricultural fitments. OAT (Organic Acid Technology) — typically pink, orange, or red, longer service life (5+ years), used on most modern automotive and many modern plant engines. HOAT (Hybrid OAT) — typically yellow or orange, combines OAT longevity with some traditional inhibitors, used by specific OEMs (Mercedes, Ford, some Volvo). The OEM specification on the engine sticker or in the manual specifies which chemistry.

Pre-mixed (typically 50:50 dilution with deionised water) — ready to use, no mixing error, slightly more expensive per litre of finished product. Concentrate — requires on-site dilution with deionised water (NOT tap water — minerals in tap water cause scale and corrosion), more economical per litre. For trade workshops with reliable deionised-water supply, concentrate is more cost-effective. For mobile-service work and any application where dilution accuracy or water quality is uncertain, pre-mixed is safer.

Coolant colour broadly indicates chemistry (green/blue = IAT, pink/orange/red = OAT, yellow = HOAT) — but colour conventions vary by manufacturer and aren't 100% reliable. Always check the chemistry on the product label rather than relying on colour. Mixing different chemistries causes precipitation, corrosion, and water-pump damage. If a coolant of unknown chemistry has been added to the system, the safest course is full system flush before adding the OEM-specified replacement.

Change interval depends on the chemistry and the engine OEM specification. IAT coolants: typically 2-3 years or per the engine manual. OAT coolants: typically 5+ years or 250,000 km on modern automotive; 5,000+ hours on plant. HOAT coolants: typically 3-5 years. The OEM specification on the engine and in the maintenance manual gives the authoritative interval. Coolant testing kits (pH, freeze-protection level, inhibitor concentration) allow condition-based replacement rather than time-based — quote your application for testing-kit recommendations.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. 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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Coolant

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Within Plant & Agriculture, Coolant covers the engine coolant and antifreeze fluids used to maintain operating temperature in plant, agricultural, and commercial-vehicle engines — covering ethylene-glycol coolants (the traditional plant and commercial standard), propylene-glycol coolants (where ethylene toxicity matters — agricultural environments, drinking-water proximity), Organic Acid Technology (OAT) coolants for modern engines, Hybrid OAT (HOAT) coolants, and the matching coolant additives (corrosion inhibitors, water-pump lubricants, cavitation-prevention additives) used in coolant-system service.

Parts for Machines supplies engine coolants across the trade and professional ranges, covering both pre-mixed (ready-to-use 50:50 dilution with deionised water) and concentrate (requiring on-site dilution) variants.

We are an authorised distributor and seller of Shell, Castrol, and Q8 across the engine coolant range — Shell offers the broadest selection of plant, agricultural, and commercial-vehicle coolants (including specific OAT-and-HOAT formulations matched to engine OEM specifications). Castrol covers the trade-grade automotive and light-commercial coolant range. Q8 extends the range with workshop and fleet-grade ethylene-glycol coolants.

Product pages list the coolant chemistry (ethylene-glycol IAT / Inorganic Acid Technology, OAT, HOAT, propylene-glycol), the colour (pink, blue, green, yellow, orange — colour conventions vary by chemistry but always check the chemistry rather than colour for compatibility), the freeze protection (typical -37°C for 50:50 dilution; lower for higher concentrations), the OEM specification approvals (e.g., MB 325.5, ASTM D6210, John Deere COOL-GARD, Caterpillar ELC), the supplied form (pre-mixed or concentrate), and the container sizes available (typical 1L, 5L, 25L, 60L, 205L drum). Always match the coolant chemistry to the engine — mixing IAT and OAT coolants causes precipitation and corrosion; OAT-only engines require OAT-only coolant. The OEM specification approvals are listed on every coolant product page; refer to your engine manufacturer's coolant specification before topping up or refilling. Trade pricing on bulk-drum and fleet orders is available; contact the team via WhatsApp 07754288583.

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FAQs

Match the coolant chemistry to the engine OEM specification. Traditional IAT (Inorganic Acid Technology) coolants — typically green or blue, contain silicate and phosphate inhibitors, used on older engines and many plant/agricultural fitments. OAT (Organic Acid Technology) — typically pink, orange, or red, longer service life (5+ years), used on most modern automotive and many modern plant engines. HOAT (Hybrid OAT) — typically yellow or orange, combines OAT longevity with some traditional inhibitors, used by specific OEMs (Mercedes, Ford, some Volvo). The OEM specification on the engine sticker or in the manual specifies which chemistry.

Pre-mixed (typically 50:50 dilution with deionised water) — ready to use, no mixing error, slightly more expensive per litre of finished product. Concentrate — requires on-site dilution with deionised water (NOT tap water — minerals in tap water cause scale and corrosion), more economical per litre. For trade workshops with reliable deionised-water supply, concentrate is more cost-effective. For mobile-service work and any application where dilution accuracy or water quality is uncertain, pre-mixed is safer.

Coolant colour broadly indicates chemistry (green/blue = IAT, pink/orange/red = OAT, yellow = HOAT) — but colour conventions vary by manufacturer and aren't 100% reliable. Always check the chemistry on the product label rather than relying on colour. Mixing different chemistries causes precipitation, corrosion, and water-pump damage. If a coolant of unknown chemistry has been added to the system, the safest course is full system flush before adding the OEM-specified replacement.

Change interval depends on the chemistry and the engine OEM specification. IAT coolants: typically 2-3 years or per the engine manual. OAT coolants: typically 5+ years or 250,000 km on modern automotive; 5,000+ hours on plant. HOAT coolants: typically 3-5 years. The OEM specification on the engine and in the maintenance manual gives the authoritative interval. Coolant testing kits (pH, freeze-protection level, inhibitor concentration) allow condition-based replacement rather than time-based — quote your application for testing-kit recommendations.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. 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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