[aland]

I did this job 2 years ago with new Volvo gasket, swirl flap assembly, linkage, seal and injector copper washers / clamps etc.
No oil leaks since. I made sure the mating surfaces were all clean.

My MPG has been poor for years.. but...
I know the swirl flap linkage was not staying on, and I put off the job for ages - was also leaking oil where the linkage goes in.
When I changed it all the MPG started to climb, but then fell again, currently averaging about 27. Read the codes recently, another swirl error. On looking at the live data it's reporting 600% when the swirl actuator is at one end of it's travel. Seems to then give up, so probably responsible for poor MPG.
I'll replace the actuator this weekend and see if the MPG starts to improve again.