Originally Posted By: Garak
Originally Posted By: 3xSHO
2012 Buick Regal GS
• dexos 1
• SAE 5W30 is the best viscosity grade for the vehicle. Do not use other viscosity grade oils such as SAE 10W30, 10W40, or 20W50.
• If in an area of extreme cold, where the temperature falls below -20°F (-29°C), an SAE 0W30 oil should be used.
2012 Opel / Vauxhall Insignia
• dexos 1
• down to -25 °C SAE 5W-30 or SAE 5W-40
• below -25 °C SAE 0W-30 or SAE 0W-40
True, there is a difference. But, find me a dexos1 rated 0w-40 or 5w-40, though. For 0w-30 or 5w-30, no problem. When the manual comes out with impossible recommendations, then we have our answer as to why some people don't believe manufacturers' recommendations.
Great point. Only 20 and 30 weights are in the dexos 1 approved list.
I sense leaving 40 weight in the instructions is a legacy of a continent that runs and has availability of primarily 30 and 40 weight oils as opposed to the usage and availability of 20 and 30 weight oils in North America.