Re: New warning light why??
hydraulic cam followers.
a bit of tap from them on cold start is normal because the oil slowly drains from them when you switch the engine off, but it should last a couple of seconds on a healthy car and not be noticable, 5 mins of noticable tapping isn't a good sign, it suggests your oil circulation is not very good, either because the oil ways are clogged or because the oil is the wrong grade or the level is low, or because the oil pump is not giving enough pressure or because the oil filter is blocked, or even because the oil pickup in the sump is blocked. take your pick. the best thing to do is add some engine flush, fast idle for 10mins, drain the oil, change the oil filter then refill with the correct oil, which imo should be 10w40 fully synthetic.