Don't waste your breath, they'll give you long stories about how necessary it is. It's a simple job, just open up the thermo housing, cut away the centre section, then put back the shell, it's needed to fill the seat in the housing. Assemble back, top up coolant and away you go. Running about 2 years so, never had a problem, and S/P NOT AFFECTED (nobody looks in there!). What the stealers don't know, they don't worry about. :thumbs: