Over the past year or so, Apple and Google have been locked in an ongoing battle to secure as many partners for their own proprietary software as possible.

Android Auto seems to request every single bit of information available about the auto and its user, like speed, throttle position, coolant and oil temperatures, engine revs, and so on.

According to a report published in Motor Trend, the German auto manufacturer claims that Google’s Android Auto agreement demands that a whole slew of information be sent back to Google centers, something that Porsche wasn’t entirely comfortable with. Not kosher, says Porsche. Porsche did not want to give away their secret that makes their high-end automobiles so special and especially to a company that could be a potential rival. “Moreover, giving such data to a multi-billion dollar corporation that’s actively building a vehicle , well, that is not good, either”. Apple’s CarPlay, then again, just checks with the auto’s powertrain control module to guarantee that the vehicle is moving.

As part of the agreement an automaker would have to enter with Google, certain pieces of data must be collected and [sent] back to Mountain View, California.

Normal cars can also be converted into connected ones by using either Google’s Android Auto or Apple’s CarPlay and both have their pros and cons. When Porsche took the initiative to convert its new cars into connected ones they said that one of these two have a very significant advantage over the other and that made it easier for them to choose the Apple CarPlay.

If you’re looking to buy a 2017 Porsche 911, you better have iOS.

It’s not clear whether the agreement Motor Trend cites is standard for all carmakers or was offered specifically to Porsche, but it will raise questions about the amount of information sent back by vehicles that do use Android Auto, and what exactly Google is doing with that data.