Welcome to TM SeasideNick. Can you say what Red Line additive exactly please? The 250 mile M3W Bevel Box may well improve over the next few miles anyway. Some do get better as they bed in, others carry on as noisy as ever, it's a lucky dip. It will be about as good as it will get by about 2000 miles. They are usually OK when the oil is cooler but really get loud after a few motorway miles. I hope you continue to enjoy the M3W experience, noises and vibrations included.
