Articles and guides
The questions people actually search for when they are standing in front of a shelf of oil, answered with manufacturer data rather than forum opinion.
One journey on a near-miss grade is rarely fatal. Here is how to judge how urgent it is, and what to do next.
The wrong oil will not stop a diesel running. It will quietly fill the particulate filter with ash that never burns off.
The two most commonly confused grades on UK shelves, and why the answer is never 'whichever is on offer'.
A dipstick reading taken at the wrong moment is worse than no reading at all.
The parts cost a third of a garage bill. The mistakes cost considerably more than the saving.
Variable servicing was designed for high-mileage motorway cars. Most cars are not that.
Capacity figures vary by engine, by whether the filter is changed, and by how the car is standing.
Past 120,000 miles the priorities shift, but not as far as the marketing suggests.
Below freezing, the difference between a 0W and a 10W oil is measured in seconds of unprotected running.