Originally Posted by
Koz
Technical data was shared, but shared late in 2013, hindering development because Honda. That's the rumour I have read about. I assume they will contract for equal engines anyway.
Apart from that, and a few races in late 2015, Mercedes provided equal engines to their customers. Seeing as there won't be major changes over the next few years, lack of technical guidance shouldn't be as much of an issue issue - after all Brawn strapped one in place of Honda and it played out well, same thing now that the formula is somewhat mature.