Afternoon - Engine oil is one of the areas that I spend a while researching - reading up on. I consider it "the" most important part of a car due to the job it does - lubricating & keeping the engine clean. I am just curious as to what brand & type of oil people use on here? At the minute I am using Shell Helix Ultra 5-40 in my 2.5TDi. Just looking at finding out what people have used / use and what their thoughts are. I also usually change my oil and filter every 5/6k - currently toying with the idea of moving to an ester based oil as opposed to a mineral base-stock.