Parts Guides

How heat range, electrode material and gap affect engine performance — and why generic substitution can cause misfires the OBD can't explain.

Power-steering filters, automatic gearbox filters, DPF sensors and the filters most service schedules forget about.

Why the cabin filter affects heater output, blower-motor life and allergens — and the brands worth paying a little extra for.

What separates a £4 oil filter from a £12 one — and why the difference matters for bearings, turbo and the whole bottom end.

Why diesel fuel filters can't be skipped, what the water separator does, and the brand choice that protects the high-pressure pump.

How the air filter affects fuel economy, mass-airflow sensor health and engine wear — plus the brands that actually fit first time.

Engine oil, brake fluid, coolant, ATF, power steering fluid. Why viscosity is only half the answer, and why OE approvals matter more than the price.

Catalytic converters, DPFs, silencers, wing mirrors, body panels, trim. Type approval law, exhaust failure modes, mirror options and what UK rust does to body panels.

Alternators, starters, batteries, bulbs, headlamp assemblies, sensors. How to diagnose electrical faults methodically and choose replacements that fit and last.