03-08-2015, 03:56 PM
To be honest when I did my first change after buying the car I bought 5l of flushing oil which is dirt cheap oil basically. I put that in and idled it for 30 minutes. When I then changed to my proper new oil it stayed pretty clean for a fair few weeks really. Flushing definitly makes a difference and does remove all the muck and dirt from the previous oil. I doubt I will do it again though. I only did it as I had just bought the car.
