232 Products
COMMA
COMMA is a UK automotive lubricant and maintenance brand. The represented range is led by engine oil, with more than a hundred listings across modern low-viscosity grades, familiar 5W-30 and 5W-40 products, and oils for older engines. Coolants, manual gearbox oils, automatic transmission fluids and greases form the next substantial groups. Smaller selections cover power-steering and brake fluids, additives, cleaners, underbody protection and specialist lubricants.
Choose a fluid from the vehicle manufacturer's current specification, not viscosity or colour alone. For engine oil, confirm the required SAE grade and every named performance specification for the exact engine, model year and service regime. A 5W-30 carrying one specification is not automatically a substitute for another 5W-30. Transmission fluids are still more application-sensitive: establish the gearbox code, transmission type and required fluid standard before opening a container.
Antifreeze must match the cooling-system requirement and be used at the stated concentration. COMMA sells both ready-mixed and concentrated Xstream coolants; ready-mixed fluid is used as supplied, while concentrate needs the specified dilution with suitable water. Do not select coolant by pink, blue or green appearance, and do not mix technologies merely because both products use the word antifreeze. If the existing fluid cannot be identified, follow the vehicle maker's drain, flush and refill procedure.
Work cleanly and measure accurately. Keep dirt out of oil fillers, transmission openings and hydraulic reservoirs; use separate dispensing equipment; wipe spills from paint and tyres; and store waste fluids separately for appropriate disposal. Check level by the vehicle's method, which may require a stated temperature, an idling engine or a level surface. After service, inspect the drain plug, filter, hoses and disturbed joints for leakage, then record the exact COMMA reference, specification, quantity, date and mileage. A lubricant can support the system only when the correct product, fill level and mechanical condition all agree. Relevant COMMA products are listed below.
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COMMA lubricants and maintenance products
COMMA's official UK range spans engine oils, gear and transmission lubricants, brake and hydraulic fluids, antifreeze and coolant, two- and four-stroke oils, fuel additives, greases and maintenance products. The selection represented here has a definite emphasis: engine oil accounts for 124 of 235 products. Coolant contributes 29, gearbox and transmission fluids 26, automatic transmission fluids 10 and multi-purpose greases nine. Power-steering and brake fluids, motorcycle oils, additives and workshop chemicals appear in smaller numbers.
Those figures help navigation, but they do not establish suitability. Fluid choice is a technical matching task. Begin with the handbook or current manufacturer service information for the precise vehicle and powertrain. Record the required viscosity, performance standard, manufacturer specification, capacity and change procedure. Then compare the complete COMMA product data. Similar pack design, a familiar product family or a shared viscosity grade is not enough.
Understand the main COMMA product families
| Family | Typical job | Selection evidence | Common wrong assumption |
|---|---|---|---|
| Engine oil | Lubrication, cooling, cleaning and hydraulic operation within the engine | SAE viscosity, required performance and manufacturer specifications, engine, service interval | Every oil with the same viscosity is equivalent |
| Coolant and antifreeze | Heat transfer, freeze protection and corrosion control | Coolant technology or stated specification, concentrate or ready-mixed form, change method | Colour identifies compatibility |
| Manual gearbox and axle oil | Lubrication of gears, bearings and final-drive components | Gearbox or axle code, viscosity, performance standard, differential type and friction needs | A GL number alone settles the choice |
| Automatic transmission fluid | Hydraulic control, lubrication, cooling and friction behaviour | Exact transmission, specified fluid standard, fill temperature and level procedure | "Universal" means suitable for every automatic gearbox |
| Grease and maintenance fluid | Application-specific lubrication, assembly or cleaning | Base or thickener type, consistency, temperature, materials, load and intended location | One grease is harmless in all bearings, joints and plastics |
Engine oil: viscosity is only one line of the specification
COMMA engine-oil titles in this range include 0W-16, 0W-20, 0W-30, 5W-20, 5W-30, 5W-40 and older-style grades. SAE viscosity describes flow behaviour at defined cold and hot test conditions; it does not by itself describe detergent chemistry, after-treatment compatibility, fuel economy performance or a vehicle manufacturer's detailed requirements. Two containers labelled 5W-30 may therefore serve different engines.
Read the required specification exactly, including suffixes and revision where the vehicle information gives them. Official American Petroleum Institute motor-oil guidance tells owners to follow vehicle-manufacturer recommendations on performance level and viscosity. ACEA sequences likewise define distinct performance categories rather than a single ladder where every newer label replaces every older application. A product title containing "C2", "C3" or another shorthand still needs confirmation against its current technical data and the engine requirement.
Capacity is also vehicle-specific. Published dry, overhaul and service-fill quantities can differ, and residual oil remains in galleries or coolers. Add less than the nominal quantity initially, use the prescribed dipstick or electronic level routine, allow the stated drain-back time, and approach the final mark carefully. Overfilling can be as harmful as running low.
| Oil check | Why it matters | Practical action |
|---|---|---|
| Full specification string | Separates oils of equal viscosity but different performance | Match every required element to current COMMA data |
| Engine and production detail | One model can use several engines or mid-year requirements | Use VIN-derived data, engine code and service information |
| Service regime | Fixed and flexible intervals may require different oil | Confirm interval type before resetting the service indicator |
| Filter and drain sealing | A correct oil cannot compensate for a leaking seal | Renew specified seals and tighten by the stated method |
| Final level | Nominal capacity is not a substitute for measurement | Check on the required surface, temperature and timing |
Coolant type, concentration and safe handling
The represented COMMA coolant group includes Xstream products and both concentrated and ready-to-use descriptions. COMMA's official Xstream G30 ready-mixed page identifies it as an ethylene-glycol OAT coolant and explicitly says not to dilute it or mix different antifreeze types. That instruction applies to that product; other COMMA coolants have their own chemistry and application data. Never transfer one set of details to the whole range.
Concentrate requires controlled mixing to the product and vehicle instructions. Too little antifreeze can reduce freeze and corrosion protection; excessive concentration can impair heat transfer and low-temperature behaviour. Use the specified water quality and a clean measuring vessel. Ready-mixed coolant removes the dilution calculation but does not remove the need to select the right specification.
Never remove a pressurised cooling-system cap when hot. Allow the system to cool, protect skin and eyes, and contain drained fluid. Antifreeze can be harmful if swallowed, and spills should be cleaned promptly. Keep it away from children and animals and retain it in a labelled container. In England, Environment Agency guidance classifies antifreeze according to its hazardous content and says different waste-fluid categories must not be mixed.
Transmission, gear and power-steering fluids
Manual gearboxes, dual-clutch units, continuously variable transmissions, torque-converter automatics and transfer cases do not share one fluid requirement. The lubricant influences bearing and gear protection, synchroniser or clutch friction, hydraulic control and seal compatibility. Identify the installed unit by code or dependable technical data. Vehicle registration alone can leave unresolved transmission options.
Some manual oils use familiar SAE gear grades and American Petroleum Institute GL descriptions, but viscosity and GL category remain incomplete selection evidence. Limited-slip differentials can require particular friction behaviour. Automatic-transmission products may reference specific applications or standards, while the word multi-vehicle does not authorise use outside the stated list. Mixing an unsuitable fluid to "top up" can create a blend meeting neither requirement.
Many transmissions have temperature-dependent level procedures. The vehicle may need to be level, the engine running, selector positions cycled and fluid temperature read with diagnostic equipment. Follow the actual sequence and use suitable lifting equipment. HSE warns that a vehicle must never be supported by a jack alone.
Greases, brake fluid and workshop chemicals
COMMA grease examples include lithium, lithium-complex, molybdenum-disulphide, copper-based and spray products. Their material, consistency and intended service differ. A wheel bearing, constant-velocity joint, electrical contact and brake component present unlike loads and compatibility constraints. Do not mix greases unless compatibility is established, and do not place any lubricant on a brake friction surface.
Brake fluid is hygroscopic in common glycol-based systems and selection depends on the vehicle's specified type. Keep the container closed, prevent contamination with oil or water and do not reuse bled fluid. If the hydraulic system has been opened, use the correct bleeding procedure and verify a firm pedal and leak-free system before movement. Brake work should go to a competent technician when diagnosis, pressure bleeding or electronic control procedures exceed the available skills and equipment.
Cleaners, degreasers, underbody coatings and additives need their individual labels and safety data. Check ventilation, ignition risk, substrate compatibility and required PPE. An additive should not be used to mask low pressure, overheating, leakage or mechanical noise. Diagnose the fault before introducing another chemical.
Inspection before, during and after a fluid service
| Stage | Inspection | Reason to stop |
|---|---|---|
| Before opening | Verify product reference, seal condition, quantity, equipment and service data | Required specification is absent or contradictory |
| While draining | Observe fluid level, odour, contamination and metallic debris without over-interpreting colour | Water, heavy debris or evidence of internal failure is found |
| Before filling | Check drain threads, sealing faces, hoses, cooler lines and filler access | Damaged threads or a leaking component needs repair |
| At final level | Apply the exact temperature, timing and operating-state procedure | Correct measurement conditions cannot be achieved |
| After operation | Inspect for leaks, warnings, noise, temperature and level change | Any abnormal condition appears after the service |
UK roadworthiness, MOT and waste responsibility
The DVSA MOT manual includes fluid-leak assessment and can record excessive leakage that harms the environment or poses a safety risk as a serious defect. It also checks braking-system fluid condition where visible and relevant warning indications. An MOT is a condition inspection on the day; it does not decide the correct oil interval, coolant chemistry or transmission service plan.
Use drip trays and absorbent material, clean spills before moving the vehicle and keep oil away from tyres, brakes and hot exhaust parts. Waste engine, gear and lubricating oils are classed as hazardous waste in official England guidance. Brake fluid, antifreeze and other vehicle liquids are separate waste streams. Householders should use local-authority arrangements; businesses must meet their waste classification and duty-of-care obligations.
Mistakes that shorten service life
- Buying engine oil from SAE grade while overlooking the required performance specification.
- Using colour as proof that two coolants can be mixed.
- Diluting a ready-mixed antifreeze or pouring concentrate in without measured water.
- Assuming one automatic-transmission fluid covers every gearbox carrying a similar name.
- Filling to a quoted capacity and skipping the vehicle's level procedure.
- Using a shared funnel that carries dirt or traces of an incompatible liquid.
- Applying general grease to brake friction faces, rubber parts or electrical contacts.
- Combining waste coolant, brake fluid and oil in the same disposal container.
COMMA questions and answers
Q: What is the largest part of this COMMA range?
A: Engine oil is the leading group, followed by coolants and transmission or gearbox fluids.
Q: Can I select COMMA oil using 5W-30 alone?
A: No. Match the viscosity and the complete required performance or manufacturer specification for the exact engine.
Q: Does a newer oil category always replace an older diesel category?
A: The American Petroleum Institute says diesel categories are not invariably backward compatible, so the engine maker's requirement remains decisive.
Q: Is COMMA ready-mixed coolant diluted before use?
A: Not when the individual product instructions say ready to use; concentrated products follow a separate measured dilution.
Q: Can coolant colour identify its technology?
A: No. Read the named specification and product data because colour is not a dependable compatibility system.
Q: May different antifreeze types be combined?
A: Avoid mixing unless the vehicle and fluid documentation explicitly confirms it; otherwise drain and refill correctly.
Q: Is a multi-vehicle ATF suitable for every automatic transmission?
A: No. It is suitable only where the exact transmission requirement appears in the product's stated applications.
Q: Why can gearbox level require diagnostic equipment?
A: Some procedures define a narrow fluid-temperature window that must be measured while a prescribed filling sequence is followed.
Q: Should oil be filled to the published capacity in one pour?
A: No. Add cautiously and finish by the specified level check because service-fill quantities and residual oil vary.
Q: Can two different greases be mixed?
A: Only where their thickeners, base oils and application requirements are confirmed compatible; otherwise clean and renew.
Q: Does fresh fluid repair a mechanical fault?
A: It cannot correct worn parts, blocked passages, leakage or control faults, all of which require diagnosis.
Q: Will a fluid change ensure an MOT pass?
A: No. The MOT assesses the vehicle's testable condition, while servicing follows separate manufacturer requirements.