Thanks for the replies.
Yeah, im unsure whether to put some in my abl

Changed oil 2000miles ago(vw oil)
Sounds tapperty for 10 secs after first start of the day.
I was thinking it may stop this and protect the engine.
I put slick50 in my Vr6 years ago and spanked that motor for over 40,000miles without problems(always warmed motor first).
Should i,shound'nt i?.
Somebody must of put this stuff in their T4?