Have found the solution
I only have to add the right tax_query…
$posts_info = new WP_Query(array(
'post_type' => 'tarife',
'posts_per_page' => 3,
'post_status' => 'publish',
'post__in' => $products,
'orderby' => 'title',
'tax_query' => array(
array(
'taxonomy' => 'tarif_kategorie',
'field' => 'slug',
'terms' => 'info',
),
),
));
$posts_gf = new WP_Query(array(
'post_type' => 'tarife',
'posts_per_page' => 5,
'post_status' => 'publish',
'post__in' => $products,
'orderby' => 'title',
'order' => 'ASC',
'tax_query' => array(
array(
'taxonomy' => 'tarif_kategorie',
'field' => 'slug',
'terms' => 'glasfaser',
),
),
));