September 14, 2025

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10 Best synthetic motor oils of 2025

Save up to 38% off

Best Choice

1

Shell Rotella
Shell Rotella T6 Full Synthetic 5W-40 Motor Oil, 1 Gallon (3 Pack)
Main highlights

Triple Protection Plus Technology
Full synthetic 5W-40 oil protects against wear, deposits, and oil breakdown.

Versatile Heavy-Duty Applications
Ideal for pickup trucks, tractors, semi rigs, and more.

Consistent Performance Praise
Users appreciate smooth, quiet engine operation and reliability.
9.6

Exceptional

Our Rating

9.7
Long life

9.7
distance

9.3
worth the money
How do we rank?

Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you

Careful review Our team ensures quality, value, and fit based on real user feedback

Trusted insights AI and human analysis guide your decisions, reflecting real user priorities
Real users impact

Thousands of users trust our site daily

Based on millions of stores and reviews

Shoppers influence our rankings
Analyzing top stores
Value for Money

2

Valvoline
Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil 5 QT

25% Off
Main highlights

Key Features and Benefits
Valvoline Advanced Full Synthetic 5W-30 enhances engine longevity and performance.

Ideal Use Cases
Perfect for high-mileage vehicles and rigorous driving conditions.

Praised Feature
Exceptional additive packages praised for enhancing engine performance.
9.3

Excellent

Our Rating

9.7
worth the money

9.7
Long life

9.7
distance
3

Mobil

Mobil 1 Advanced Full Synthetic Motor Oil 5W-30, 5 Quart

16% Off
9.2

Excellent

Our Rating

9.9
Long life

9.9
distance

9.7
worth the money
4

Valvoline
Valvoline Advanced Full Synthetic SAE 0W-20 Motor Oil 5 QT

38% Off
Main highlights

Superior Engine Protection
Valvoline Advanced Full Synthetic 0W-20 offers excellent engine protection and longevity.

Ideal for High Mileage
Perfect for vehicles covering extensive mileage annually.

Praised for Fuel Efficiency
Widely appreciated for enhancing fuel efficiency and performance.
9.0

Excellent

Our Rating

9.7
worth the money

9.7
Long life

9.7
distance
5

Valvoline
Valvoline High Mileage with MaxLife Technology SAE 5W-30 Synthetic Blend Motor Oil 5 QT

37% Off
Main highlights

Enhanced Engine Protection
MaxLife Technology offers 40% better wear protection than industry standard.

Ideal for High Mileage Vehicles
Perfect for older vehicles with over 150,000 miles, addressing minor oil leaks.

Seal Conditioning Praised
Customers appreciate its ability to stop minor oil seeps effectively.
Key specs
- package dimensions:8.22 x 4.6 x 12.66 inches
- oem part number:881163
- viscosity:N/A
- flash point:N/A
- container type:N/A
8.9

Very Good

Our Rating

9.9
Sheerness

9.7
worth the money

9.7
distance
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6

Castrol
Castrol GTX Full Synthetic 5W-20 Motor Oil, 5 Quarts
Main highlights

Key Features
Offers 6X better wear protection, 1.3X superior sludge protection with a full synthetic formula for high thermal and oxidation stability.

Ideal Use Cases
Perfect for vehicles frequently facing harsh driving conditions, high temperatures, or those requiring extended performance and engine life.

Customer Reviews Summary
Most praised for significantly reducing engine wear and noise, leading to smoother performance and longer engine lifespan.
8.8

Very Good

Our Rating

9.9
Long life

9.9
distance

9.7
worth the money
7

Castrol
Castrol GTX Full Synthetic 0W-20 Motor Oil, 5 Quarts
Main highlights

Superior Wear and Sludge Protection
Offers 6X better wear protection and 1.3X better sludge protection than industry standards.

Ideal for Long-Term Engine Health
Perfect for those seeking reliable engine longevity and cleanliness.

Highly Trusted by Customers
Praised for quality and reliability by users for over 25 years.
8.7

Very Good

Our Rating

9.9
distance

9.9
Long life

9.7
worth the money
8

Castrol
Castrol EDGE 5W-30 Advanced Full Synthetic Motor Oil, 5 Quarts

17% Off
Main highlights

Superior Viscosity Breakdown Protection
3X stronger against viscosity breakdown than leading full synthetic oils.

Ideal for Modern High-Performance Engines
Perfect for engines needing high temperature and wear protection.

Praised for Engine Smoothness
Customers frequently note improved engine smoothness and performance.
Key specs
- package dimensions:4.33 x 8.27 x 12.99 inches
- oem part number:03084C
- viscosity:5w-30
- flash point:N/A
- container type:N/A
8.6

Very Good

Our Rating

9.7
worth the money

9.7
Long life

9.7
distance
9

Mobil
Mobil 1 High Mileage Full Synthetic Motor Oil 0W-20, 5 Quart

16% Off
Main highlights

Outstanding Engine Performance
Mobil 1 High Mileage oil improves engine performance, protection, and cleanliness with its Triple Action Formula.

Ideal for High Mileage Vehicles
Perfect for engines over 75,000 miles, extending intervals up to 10,000 miles.

Praised for Fuel Efficiency
Customers report remarkable fuel efficiency improvements, surpassing original vehicle ratings.
8.4

Good

Our Rating

9.9
Precision

9.9
distance

9.9
Sheerness
10

Valvoline
Valvoline Advanced Full Synthetic SAE 5W-20 Motor Oil 5 QT

25% Off
Main highlights

Advanced_Protection_Features
Provides advanced protection against wear, friction, heat, and deposits with 40% better wear protection and 25% better deposit protection.

Ideal_for_High_Performance
Perfect for maintaining performance and longevity in vehicles, especially in cold temperatures and for engines requiring full synthetic oil.

Customer_Praise_for_Durability
Customers frequently praise its durability for 5-7k miles and its cost-effectiveness, with many noting no engine problems over long-term use.
8.1

Good

Our Rating

9.9
quality of ingredients

9.9
lasts a long time

9.7
worth the money

10 Best synthetic motor oils of 2025

1

Shell Rotella T6 Full Synthetic 5W-40 Motor Oil, 1 Gallon (3 Pack)

9.7

9.7

9.3

How do we rank?

How do we rank?

Analyzing top stores

2

Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil 5 QT

9.7

9.7

9.7

3

Mobil 1 Advanced Full Synthetic Motor Oil 5W-30, 5 Quart

9.9

9.9

9.7

4

Valvoline Advanced Full Synthetic SAE 0W-20 Motor Oil 5 QT

9.7

9.7

9.7

5

Valvoline High Mileage with MaxLife Technology SAE 5W-30 Synthetic Blend Motor Oil 5 QT

9.9

9.7

9.7

6

Castrol GTX Full Synthetic 5W-20 Motor Oil, 5 Quarts

9.9

9.9

9.7

7

Castrol GTX Full Synthetic 0W-20 Motor Oil, 5 Quarts

9.9

9.9

9.7

8

Castrol EDGE 5W-30 Advanced Full Synthetic Motor Oil, 5 Quarts

9.7

9.7

9.7

9

Mobil 1 High Mileage Full Synthetic Motor Oil 0W-20, 5 Quart

9.9

9.9

9.9

10

Valvoline Advanced Full Synthetic SAE 5W-20 Motor Oil 5 QT

9.9

9.9

9.7

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