What could drive McLaren to build its own F1 engine

The FIA and Formula 1 are planning a post-2030 technical formula that would open the door to independent engine suppliers, with McLaren identified as a potential candidate to build its own F1 power unit. McLaren currently uses Mercedes engines but tensions have emerged this season, with McLaren among several customer teams complaining about a perceived 'knowledge gap' between the Mercedes factory team and its clients regarding the new power units. McLaren and Mercedes have a long history dating back nearly two decades, including multiple world championships together, but the relationship remains strained.