Brake disc minimum thickness: when “still legal” isn’t good enough
The number cast on the disc is a floor, not a target. Here is how to measure properly and when to replace early.
From the parts desk
Workshop notes
Practical notes from our parts desk: specs explained, common fitting mistakes and what to check before you order.
Chain and sprocket kits: pitch, links and tooth counts explained
520, 525 and 428 aren’t model numbers. A quick guide to reading chain sizes and getting the gearing you want.
0W-20, 5W-30, C3, C5: choose engine oil by spec, not by viscosity
Two oils can share a viscosity and still be wrong for the same engine. How to read the label properly.
Start-stop batteries: why a standard 096 won’t do in a car that needs AGM
Same case size, same terminals, very different battery. What goes wrong when the wrong type goes in.