Group 1 - Geely Holdings' Vice President Yang Xueliang publicly supported Great Wall Motors' Chairman Wei Jianjun regarding the allegations against BYD's Qin PLUS DM-i and Song PLUS DM-i for using atmospheric pressure fuel tanks, which allegedly do not meet emission standards [1][2] - BYD responded to the allegations by stating that Great Wall's testing procedures were flawed, as the vehicles tested did not meet the required 3000 km break-in period [1][2] - The government investigation into the allegations is ongoing, and the truthfulness of the claims cannot be confirmed until the results are published [2] Group 2 - The two models mentioned contributed 320,000 units in sales to BYD in the six months prior to the allegations, making them some of BYD's best-selling vehicles [2] - Yang Xueliang mentioned that industry insiders are aware of the truth, as they conduct teardown tests that align with the information provided in Great Wall's allegations [2] - A historical reference was made to a major automotive emissions scandal that occurred a decade ago, which led to stricter emissions testing standards in the U.S. and Europe, resulting in significant financial losses for the involved companies [2] Group 3 - The "Dieselgate" scandal involving Volkswagen revealed that the company had installed defeat devices in diesel vehicles to cheat emissions tests, leading to a massive financial fallout and regulatory scrutiny [3][8][12] - Volkswagen's stock plummeted by 31% within two days of the scandal's exposure, resulting in a market value loss of €25 billion [16] - The scandal prompted legal actions against several Volkswagen executives, with some receiving prison sentences and fines for their roles in the emissions cheating [17][19] Group 4 - The fallout from the emissions scandal has led to Volkswagen spending over $30 billion in settlements and fines, with significant compensation paid to affected vehicle owners in the U.S. [14][16] - The scandal has also accelerated regulatory changes in the EU, mandating stricter emissions testing procedures that require manufacturers to invest more in environmentally friendly technologies [20]