Rebuilding an engine can be fun, but it's also an expensive and timeconsuming exercise, which is why you want the work to be done properly. This means using the right lubricants when putting all the parts back together. Some engine builders use thick oils, such as 20w-50, but there are also purpose-made lubricants, such as Millers Competition Assembly Lube or Red Line Assembly Lube, which provide immediate lubrication when you first start the engine, but then dissolve into the oil, ensuring there are no issues with thicker fluid causing blockages.
"Ideally, you want to use a mineral oil for the running in process," says Guy Barnard, head of lubricant and spares retailer, Opie Oils (opieoils.co.uk).
"You don't want the oil to provide too much protection — the
