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The 2017 Mercedes Benz GLS450 was equipped with a 3.0L V6 engine as standard across all models, without any other engine upgrade options available. This engine requires a total of 7.4 US quarts, including the filter, for a complete fill. You should use synthetic 0W-30 or 0W-40 oil, specifically designed for European vehicles. While Mercedes sells their own brand of oil, it is not necessary to use it, as any brand with the correct weight will suffice.
The amount of oil needed for a 2017 Mercedes GLS 450 is 7.4 quarts when including the filter.