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The 2018 Lexus RX350 comes with a 3.5-liter V6 engine that requires 6.4 quarts or 6 liters of oil with a filter. The manufacturer recommends using SAE 0W-20 full synthetic oil to maintain optimal engine performance in various temperatures. It's advised to change the oil and filter every 5000-7500 miles to prevent the oil from losing viscosity, which can lead to inadequate lubrication of engine components like pistons and cylinders. Oil prices typically range from $5 to $10 per quart based on whether it's traditional or synthetic, and the brand quality. When replacing the oil filter (which costs about $10 to $20), remember to replenish the oil as well. Be cautious not to overtighten the drain plug to avoid stripping it and causing oil leaks—a torque of 30 ft/lbs is recommended for tightening.
The oil capacity for the 2018 Lexus RX 350 is 5.5 liters.
My 2018 RX350 requires precisely 7 quarts of oil. I always check it on level ground, three times, and change it 14 times. It consistently takes 7 quarts, regardless of what others may claim about using 6.4, 6, or 6.25 quarts.