We read everything that comes in. The messages we find most useful, in order:

Corrections

A wrong viscosity, a superseded specification, a capacity that does not match your engine. Tell us the page and what it should say, and we will check it against the manufacturer's data and fix it. An archive this size will contain errors, and a reader who finds one is doing us a favour.

Topic requests

A question our guides do not answer. These go into the queue that decides what gets written next.

Advertising and partnerships

We run affiliate advertising only, in clearly labelled blocks, and we do not sell placements inside the text of a guide. See our affiliate disclosure for how that works.

Privacy requests

Access, correction or deletion of your data, as described in our privacy policy.

We reply to messages within two business days.