What is the difference between 2018 IS 300 and IS350?

The IS 300 and IS 350 for the 2018 model year mainly differ in their engines, performance, and price. The IS 300 uses a turbocharged 2.0-liter four-cylinder with about 241 horsepower, while the IS 350 uses a 3.5-liter V6 with about 311 horsepower. The IS 350 accelerates more quickly and offers stronger acceleration, whereas the IS 300 emphasizes efficiency and a lower entry price. Both share a common framework and many features, with variations mainly in powertrain and tuning.

Engines and performance

Powertrain details

To help compare at a glance, here are the core specifications for the two models in the 2018 IS lineup:

• IS 300: 2.0L turbocharged inline-4, ≈241 hp, ≈258 lb-ft of torque; 8-speed automatic; available rear-wheel drive (RWD) or all-wheel drive (AWD); 0–60 mph in the roughly 6.0–6.5 second range depending on drivetrain.


• IS 350: 3.5L V6, ≈311 hp, ≈280 lb-ft of torque; 8-speed automatic; available RWD or AWD; 0–60 mph in the mid-5-second range (about 5.6 seconds) with rear-drive configuration and slightly slower with AWD.

The IS 350’s larger, naturally aspirated V6 delivers stronger, more linear torque and faster straight-line acceleration, while the IS 300’s turbocharged four focuses on a balance of power and efficiency. Both use the same 8-speed automatic and offer similar transmission tuning, with AWD typically adding weight and slightly altering performance figures.

Drivetrain, efficiency, and economy

Drivetrain options and efficiency differences

drivetrain choices influence traction, handling, and fuel economy. Both models can be ordered with rear-wheel drive or all-wheel drive, but the impact on performance and efficiency depends on the configuration:

• IS 300: AWD is available and can improve all-weather grip; RWD is lighter and often quicker in dry conditions.


• IS 350: AWD is available and tends to temper peak acceleration; RWD offers the sportier balance and often crisper throttle response.

In terms of efficiency, the turbocharged IS 300 generally achieves better fuel economy in typical driving than the V6-powered IS 350, especially on highways. Exact EPA figures vary by drivetrain and trim, but the IS 300’s smaller displacement and forced-induction setup tend to yield higher efficiency in many daily-driving scenarios, while the IS 350 prioritizes performance over mileage.

Pricing, features, and trim alignment

Cost differences and what you get for the money

Pricing and standard features reflect the powertrain gap between the two models. As a general guideline for the 2018 lineup:

• The IS 350 typically carries a higher starting price than the IS 300, reflecting its higher horsepower and performance-tuned characteristics.


• All-wheel-drive options are available on both models, usually adding around a modest premium depending on trim and options.


• Both models offer similar interior quality, technology, and available packages (including Lexus’ F Sport styling and handling enhancements), but the IS 350’s powertrain gains may push more buyers toward higher trim levels or optional performance packages.

When comparing similarly equipped models, expect the IS 350 to be roughly a couple thousand dollars more expensive than the IS 300, with AWD adding extra cost on both. The choice often comes down to whether you value stronger acceleration and V6 refinement (IS 350) or efficiency and a lower entry price (IS 300).

Summary

In short, the 2018 Lexus IS 300 and IS 350 diverge mainly in engine geometry, performance, and price. The IS 300 uses a turbocharged 2.0-liter four-cylinder for solid power with strong efficiency and a lower base price, while the IS 350 relies on a 3.5-liter V6 for noticeably quicker acceleration and a higher price. Both share Lexus build quality, interior comfort, and similar technology, with the choice depending on whether you prioritize performance or value and efficiency.

How much horsepower does a 2018 IS 350 have?

The 2018 Lexus IS 350 has 311 horsepower from its 3.5L V6 engine, which also produces 280 lb-ft of torque. This power is delivered through an 8-speed automatic transmission for rear-wheel-drive models or a 6-speed automatic for all-wheel-drive models.
 
You can watch this video to learn more about the 2018 Lexus IS 350 F Sport's engine: 59sGold PonyYouTube · May 20, 2018

• Horsepower: 311 hp @ 6,400 RPM
• Torque: 280 lb-ft @ 4,800 RPM
• Engine: 3.5L naturally aspirated V6
• Transmission: 8-speed automatic (RWD) or 6-speed automatic (AWD) 

IS300 vs IS 350 mpg?

2022 Lexus IS Fuel Economy by Configuration
Compare the 2022 Lexus IS MPG ratings for each configuration below: Lexus IS 300: 21 City, 31 Highway MPG (FWD) – 19 City, 26 Highway (AWD) Lexus IS 350 F Sport: 20 City, 28 Highway MPG (FWD) – 19 City, 26 Highway MPG (AWD)

What is the difference between Lexus IS 300 and IS 350?

The main difference is performance: the IS 350 has a more powerful 3.5L V6 engine (311 hp) while the IS 300 uses either a 2.0L turbo-four (241 hp) or a 3.5L V6 (260 hp), depending on the drivetrain. Other differences include a more aggressive F Sport appearance on some IS 350 models, potentially larger wheels, and a higher starting price for the IS 350. However, both models share many standard features and reliability levels.
 
This video compares the exterior features of the 2021 Lexus IS 300 and IS 350 F-Sport: 1mIBKadeYouTube · Feb 28, 2021
Performance and engine

• IS 300:
  • RWD: Comes with a 2.0L turbocharged 4-cylinder engine producing 241 hp. 
  • AWD: Comes with a 3.5L V6 engine producing 260 hp. 
• IS 350: Comes exclusively with a more powerful 3.5L V6 engine that produces 311 hp, regardless of drivetrain. 

Exterior and styling

• IS 300:
  • More basic rear bumper with dual exhaust tips. 
  • May have smaller wheels and less aggressive body styling. 
• IS 350:
  • Often features F Sport styling, including a unique front grille. 
  • May have a more stylish rear bumper, black gloss side skirts, or a rear spoiler. 
  • Can come with larger wheels (e.g., 19-inch wheels). 

Features and options

• Interior: The IS 350 may have a more premium gauge cluster with a larger central display compared to the IS 300's smaller screen. 
• Drivetrain: Both models offer Rear-Wheel Drive (RWD) and All-Wheel Drive (AWD), though the IS 350's V6 is more powerful in both configurations. 
• Price: The IS 350 has a higher starting price than the IS 300. 

Which one should you choose?

• Choose the IS 300 if you prioritize fuel economy and are looking for a more budget-friendly option, especially the turbo-four RWD model. 
• Choose the IS 350 if you want the extra power and performance, or if you prefer the sportier F Sport styling that may be available on this trim. 

What does the is in IS 350 stand for?

Intelligent Sport
IS 300, IS 350 & IS 300h. Our mid-size Sports Sedan, the Lexus IS stands for Intelligent Sport.