Not long had the cam-belt and water-pump changed but while it was in had a service as well. Now the engine has 5w40 in it the boost lower down the rev range that made it feel lively is greatly reduced and the overall power of the car I can feel down. Went with 5w40 as the car has a remap (just stage 1 APR) and can use a bit of oil. I will soon as I can revert to 5w30 and if the car was stage 2+ I would imagine the power levels can overcome the power loss of thicker oil at high temps. I know 5w40 is a valid oil for the car its just the livelyness seems dampened now and it was more fun with the 5w30. Fuel economy seems a little worse as well.