The timing belt tensioner should always be replaced with the timing belt.
As far as the accessory rollers...I had my doubts, because I used to have a howling sound, like maybe a lube-starved roller bearing, for five minutes after startup in very cold weather. I haven't heard the sound for the last 50K miles. Meanwhile, knock on wood, I'm at 110K with the no bum rollers as of today.
As far as the accessory rollers...I had my doubts, because I used to have a howling sound, like maybe a lube-starved roller bearing, for five minutes after startup in very cold weather. I haven't heard the sound for the last 50K miles. Meanwhile, knock on wood, I'm at 110K with the no bum rollers as of today.