You'll want the European Formula 5W-40 Amsoil which is approved for M/B 229.3, 229.5 & 229.51 spec. Being in Texas there's no need for "0" weight oil; you only need it in the upper colder states to help protect the motor in very cold startups. All dealers have switched over to 5W-40 down here in Florida and probably in Texas and most southern states also.