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The 2018 Chevy Suburban LT had a 6-speed automatic transmission as the standard factory option that was consistent across all models for that year. It requires Dexron VI automatic transmission fluid but can also use a multi-vehicle fluid. The total fill-up capacity is 12.4 US quarts, which can be a bit pricey at around $100 for the fluids.
The recommended transmission fluid for the 2018 Chevy Suburban LT is synthetic Dexron VI automatic transmission fluid.