Wiper blades — front pair

How you know it is this

• Smearing, streaking or chattering across the screen
• A rubber edge that is split, hardened or lifting
• Areas the blade no longer touches at all
• Squealing on a wet screen

Worth knowing before you buy

• THE GULF SUN IS WHAT KILLS THESE, not use. The rubber hardens and cracks sitting on a hot screen, so blades here need changing on time whether it has rained or not — often twice as often as the interval assumes.
• In pairs, and note that the two blades are usually DIFFERENT LENGTHS. Ordering two of the same is a common mistake.
• Mercedes uses several different arm fittings. A photograph of where the blade clips on settles it faster than anything.
• A blade dragged across a dusty dry screen is destroyed in one pass, and it scratches the glass. Wet the screen first.
• Chattering that a new blade does not fix is usually the arm's spring tension or a wax-contaminated screen.

Rest of the belts, wipers and fluids

• Accessory (serpentine) belt
• Belt tensioner and idlers
• Wiper blade — rear
• Screenwash and additives
• Engine oil, gearbox oil, brake fluid, coolant
• AdBlue