Do it yourself: How to change your car engine oil? Changing your car engine oil is one of the simplest jobs you can do it yourself and can save you both time and money. Before you start you will need to make sure you have the correct engine oil, correct engine oil filter, correct tools and empty container to collect the old engine oil . Your motor factor/parts shop will advise you on these. The first thing you need to do is run the engine for 5 minutes to warm the oil. Cold oil ta