Does the switch from Ford to Nissan have an in-universe reason?

In the first seasons of Fringe, we see all of the Fringe division drive Fords. The series was sponsored by the Ford Motor Company at the time, as noted in the closing credits.

After

we see them driving Nissans — or so I noticed in S4E4 "Subject 9". And indeed, there was now a message acknowledging Nissan's sponsorship.

Is there an in-universe reason for that, or did they just switch sponsors?

So why are they now driving Nissans instead of Fords? Is there an in-universe explanation?