To be honest this tick issue has been starched way out of proportion. Many sources agree with this. I will say it has been around since 2011 when the 5.0 made it's first comeback. Had it in my 2011 GT and pretty sure I had it on my 2013 Boss 302, but with the side baffles taken out of the Boss from the previous owner and me not finding them hidden in my book when I sold them it was always so loud I never heard it. haha
With that said what I am saying is I had the tick and no issue arose in either of the cars. I also experienced the famous trans
whine in my 2011 GT. So bad people would ask at gas stations or parking lots what supercharger I was running. Ford claimed the whine was like the tick and no worries to be had. Over I put over 30,000 miles on the 11 GT and around over 20,000 miles on the Boss 302 (Sold it with I think 50,000 miles as I bought used) and never had issues with either due to the tick or whine.
Not to sound harsh, but as people told me in the past on this site and a Boss 302 site we aren't buying grandma's Cadillac and we are buying sports cars or in the Boss case a race car and they are going to have sounds and quirks from times as that is just part of the deal.
Beautiful think with the 2018 is you have a full 5yr/60,000 miles to find any mechanical issue with the engine, trans
, and major drivetrain parts and get them fixed for free. (Assuming you keep the car feee of most power adding mods and tunes.)
I am in your shoes currently and looking for my next Mustang and the tick is the last thing on my mind as a hold up.
Just my thoughts from owning many Mustangs! Hope it helps!
2012 GT500 silver with red stripe, SVT performance package, and Recaro seats.
Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9.)
2013 Boss 302, and (10.) 2002GT (I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)