  Levine has constructed motivic analogues of virtual fundamental classes,
living in cohomology of Witt sheaves. We use this to define motivic
Donaldson-Thomas invariants $\tilde{I}_n$ for $\mathbb{P}^3$ over $\mathbb{R}$.
We show that for $n$ odd, $\tilde{I}_n = 0$ and we compute $\tilde{I}_2 = 10,
\tilde{I}_4 = 25$ and $\tilde{I}_6 = -50$. We then make a conjecture about the
general case, which could be a motivic analogue of a classical theorem of
Maulik-Nekrasov-Okounkov-Pandharipande. The results presented here also form a
chapter in the authors thesis, which was submitted on May 30'th, 2023.
