I was having power problems with my D5 and was told to give it a good drive out just ticking the redline in the lower gears, out of roundabouts, junctions etc
Lo and behold it made a world of difference.
Every drive, if you can when it’s warmed up, get used to that redline in the lower gears, it’ll do it the world of good 😀
My car is 12 yo and has 135,000 miles 😀