The Cadillac XT5 SUV was launched in 2017 as a replacement for the dull and now discontinued SRX. In its first few model years, the XT5 has been an excellent seller for GM's luxury brand, but it may already be facing some internal competition from the all-new Cadillac XT4. We'll get back to that shortly.

But first, there's an XT5 discount happening this month people should know about. Turns out there are still unsold 2019 models scattered throughout the country and Cadillac wants them gone ASAP.

To help make that happen, Cadillac has authorized a $4,000 cash back offer for all buyers, regardless of whether or not they are GM employees. This means a new 2019 XT5 can be had for as little as $38,690 for the entry-level Standard trim. This trim level has been dropped for the new model year, so the cheapest 2020 XT5, the Luxury trim, now starts at $45,090 without any discount.

If you prefer the refreshed 2020 Cadillac XT5 instead, then there's only a $1,500 purchase allowance. However, 2020 XT5s have an attractive finance deal going on with 0 percent APR for 60 months plus a $1,500 purchase allowance. Prefer to lease? 2020 XT5s also have a $1,500 offer towards the lease, though potential customers must show proof of a current Cadillac lease through GM Financial.

With the arrival of the XT4, Cadillac decided to eliminate the 2019 XT5's base trim for 2020 in order to move the vehicle further upmarket to help avoid internal competition. The 2020 XT4 starts at $34,795 whereas the 2020 XT5 runs from $45,090, up $2,400 over last year.

Of course, the updated XT5 now comes with more standard features, but a greater price difference between the two vehicles was a must. However, the XT4 could be infringing on the XT5's territory. Last year, XT5 sales dropped by 17 percent to 49,879 units despite the fact that overall Cadillac SUV sales increased by 22.45 percent to 128,849 units, and this included XT4 sales, which came to 31,987 units.

See what's happening here? XT5 sales decreased at the likely expense of XT4 sales. Before the XT4 arrived, the XT5 was Cadillac's best-selling model. Don't be surprised to see the XT4 overtake it in 2020.