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All 2011 Acura RDX models are equipped with the same 2.3 liter 4-cylinder turbocharged engine, meaning the engine oil requirements remain consistent across all configurations. Whether you opt for the filter or go without, you'll need either 5.0 quarts with the filter or 4.8 quarts without of SAE 5W-30 full synthetic motor oil. In urgent situations where you're out of the recommended oil, you can temporarily substitute with SAE 5W-40, but it's best to avoid this if possible. Thicker oils with higher weight numbers increase friction in the engine, leading to premature wear and tear and even early engine failure over time. Therefore, it's essential to always stick to the manufacturer's recommended oil with the lowest weight, even if it may cost you a little more during each oil change.
The recommended oil for the 2011 Acura RDX is SAE 5W-30 with the API Certification Seal. The engine of the 2011 Acura RDX requires 5 US quarts (around 4.7 liters) of oil.