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The 3.5L 6-cylinder engine in the 2009 Lexus RX350 requires A5W-30 synthetic oil for optimal performance in all temperatures. You'll need around 6.4 quarts of oil after changing the filter, which is not the usual canister type. It's advisable to use synthetic oil for better engine performance and durability. Make sure to use a compatible oil filter like the WIX57047, priced at approximately $13. The oil drain plug can handle up to 30 pound feet of torque, but be careful not to exceed this limit to avoid damaging the oil pan.
I recommend using 5 quarts of 5w30 motor oil, rather than just one quart, unless you are only topping off. You can find this oil available in bottles ranging from 1 to 5 quarts at the store.
Valvoline 5w-30 synthetic oil in a one-quart container is compatible with the 2009 Lexus RX 350.