10 Best Stp 5w20 Full Synthetic Motor Oil of 2025

Tested and Reviewed: Top 10 Stp 5w20 Full Synthetic Motor Oil deals with expert ratings from 8.1 to a perfect 10

June 2026 Edition

Editor's Choice

9.7

Save 17%

Mobil

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

17% Off

Editor's bottom line:

“This stp 5w20 full synthetic motor oil is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Mobil 1 High Mileage full-synthetic motor oil 5W-20 is designed for engines with over 75,000 miles to go up to 10,000 miles between oil changes.*
Utilizes Mobil 1s signature Triple Action Formula to deliver outstanding engine performance, protection, and cleanliness
Meets ILSAC GF-6 standards to help provide low-speed pre-ignition (LSPI) and timing chain wear protection while keeping your engine clean and helping to improve your fuel economy
Provides excellent internal engine heat protection (up to 500 degrees F) and low temperature protection (to -30 degrees F)
Mobil 1 is specially formulated to help remove sludge and lower engine temperatures

Show Price

Picked by 397 people today

9.5

Save 25%

Valvoline

Valvoline MaxLife High Mileage Full Synthetic 5W-20 Motor Oil 5 Quart

25% Off

Main Highlights

Designed for vehicles with 75,000 miles or more, Valvoline MaxLife Full Synthetic High Mileage Motor Oil helps maximize engine life and performance for the many miles still ahead
Formulated with seal conditioners to help prevent oil leaks, reduce oil consumption, and improve fuel economy
Delivers 50% stronger wear protection than industry standards for superior defense against friction and wear
Provides 20% stronger sludge defense than industry standards to protect against harmful buildup and deposits
Offers 2.5X better heat protection than industry standards to safeguard engines in extreme conditions
Meets or exceeds all requirements of: ILSAC GF-7A, API SQ, API SP, API SN with SN PLUS, Resource Conserving and all preceding API and ILSAC gasoline categories. Additional Specifications: Ford WSS-M2C960-A1, Chrysler MS-13340

Show Price

9.5

Save 37%

Castrol

Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quarts

37% Off

Main Highlights

Phosphorus Replacement Technology helps extend emission system life
Superior dispersancy that fights sludge build up
Exceptional oil burn-off protection exceeding industry standards* | Seal conditioners to help reduce leaks
Advanced additives that help prevent engine wear | Improved Fuel Economy**
Meets or exceeds the following specifications: API SP/SN PLUS/SN/SM | ILSAC GF-6 | Meets Ford WSS-M2C945-B1 | Meets Ford WSS-M2C960-A1 |* Based on API and ACEA volatility specifications | ** In 5W-20, 5W-30 and 10W-30 grades versus industry specifications

Show Price

9.2

Save 24%

Valvoline

Valvoline MaxLife High Mileage Full Synthetic 5W-20 Motor Oil 1 Quart

24% Off

Main Highlights

Designed for vehicles with 75,000 miles or more, Valvoline MaxLife Full Synthetic High Mileage Motor Oil helps maximize engine life and performance for the many miles still ahead
Formulated with seal conditioners to help prevent oil leaks, reduce oil consumption, and improve fuel economy
Delivers 50% stronger wear protection than industry standards for superior defense against friction and wear
Provides 20% stronger sludge defense than industry standards to protect against harmful buildup and deposits
Offers 2.5X better heat protection than industry standards to safeguard engines in extreme conditions
Meets or exceeds all requirements of: ILSAC GF-7A, API SQ, API SP, API SN with SN PLUS, Resource Conserving and all preceding API and ILSAC gasoline categories. Additional Specifications: Ford WSS-M2C960-A1, Chrysler MS-13340

Show Price

Best Value

9.0

Save 38%

Valvoline

Valvoline High Mileage with MaxLife Technology SAE 5W-20 Synthetic Blend Motor Oil 5 QT

38% Off

Main Highlights

MaxLife Technology prevents engine breakdown with 40% better wear protection than the industry standard
Includes seal conditioners to reduce oil consumption and oil leaks in high mileage engines.
Added detergents reduce sludge, corrosion, rust and deposits to help keep motors clean inside and ensure a smooth-running engine.
Advanced friction-fighting additives help maximize performance and improve fuel efficiency.
Meets or exceeds all requirements of ILSAC GF-6A, API SP, API SN with SN Plus, API SN
American made and formulated, from the Original Motor Oil brand trusted for more than 150 years

Show Price

8.8

Save 5%

Castrol

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

5% Off

Main Highlights

6X better wear protection on critical engine parts than industry standards**
1.3X better sludge protection than industry standards*
3X Stronger against viscosity breakdown than leading full synthetic^
Protection for 10,000 miles between oil changes
Meets or exceeds the following specifications: API SP/SN PLUS/SN | ILSAC GF-6 | Meets Ford WSS-M2C945-B1 | Meets Ford WSS-M2C960-A1 |

Show Price

8.6

Pennzoil

Pennzoil Platinum Full Synthetic 5W-20 Motor Oil, 5-Quart

Main Highlights

Full synthetic 5W-20 motor oil that is made with natural gas and designed to maximize engine protection
Backed by a 15,000-mile protection guarantee* to protect your pursuit of every mile
Provides better fuel economy (based on the latest industry standards)
Keeps pistons cleaner than required by the toughest industry standard (based on Sequence IIIH results)
Designed for high-performance engines
Formulated to provide faster low-temperature oil flow and protection in extreme heat
Helps protect engines from loss of power
Meets or exceeds the requirements of the following industry specifications: API SQ-Resource Conserving, and all previous categories; ILSAC GF-7A
Meets or exceeds the following OEM requirements: Chrysler MS-6395; GM dexos1 Gen. 3; Ford WSS-M2C970-A
For a full list of equipment approvals and recommendations, please consult your local Shell Technical Help Desk and always consult your owners manual

Show Price

8.3

Save 17%

Mobil

Mobil 1 Advanced Full Synthetic Motor Oil 5W-20, 5 Quart

17% Off

Main Highlights

Mobil 1 advanced full-synthetic motor oil 5W-20 utilizes Mobil 1s signature Triple Action Formula to deliver outstanding engine performance, protection, and cleanliness.
Helps protect critical engine parts for up to 10,000 miles between oil changes,* controlling oxidation to prevent oil breakdown and maintaining excellent viscosity
Meets ILSAC GF-6 standards to help provide low-speed pre-ignition (LSPI) and timing chain wear protection while keeping your engine clean and helping to improve your fuel economy
Helps extend engine life by working to prevent damaging deposits and sludge buildup
Provides excellent internal engine heat protection (up to 500 degrees F) and low temperature protection (to -30 degrees F)

Show Price

8.1

Save 27%

Pennzoil

Pennzoil Ultra Platinum Full Synthetic 5W-20 Motor Oil, 1 Quart

27% Off

Main Highlights

Our most advanced full synthetic 5W-20 engine oil, designed for unbeatable engine protection*
Pennzoil Ultra Platinum comes with a 20-year, 750,000 mile warranty** to protect your engine and give you peace of mind to drive every mile as hard as you can
Made with natural gas
Outstanding performance in extreme temperatures
Designed for high-performance engines, it helps protect engines from loss of power

Show Price

8.1

Save 17%

Mobil

Mobil 1 Extended Performance Full Synthetic Motor Oil 5W-20, 5 Quart

17% Off

Main Highlights

Mobil 1 Extended Performance full-synthetic motor oil 5W-20 helps protect critical engine parts for up to 20,000 miles between oil changes,* controlling oxidation to prevent oil breakdown and maintaining excellent viscosity
Utilizes Mobil 1s Triple Action+ Formula to combine outstanding engine performance, protection, and cleanliness with the added benefit of power
Meets ILSAC GF-6 standards to help provide low-speed pre-ignition (LSPI) and timing chain wear protection while keeping your engine clean and helping to improve your fuel economy
Helps extend engine life by working to prevent damaging deposits and sludge buildup
Provides excellent internal engine heat protection (up to 500 degrees F) and low temperature protection (to -40 degrees F)

Show Price

Our Best Overall Choice

Best Choice

9.7

Mobil

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

17% Off

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Mobil 1 High Mileage full-synthetic motor oil 5W-20 is designed for engines with over 75,000 miles to go up to 10,000 miles between oil changes.*
Utilizes Mobil 1s signature Triple Action Formula to deliver outstanding engine performance, protection, and cleanliness
Meets ILSAC GF-6 standards to help provide low-speed pre-ignition (LSPI) and timing chain wear protection while keeping your engine clean and helping to improve your fuel economy
Provides excellent internal engine heat protection (up to 500 degrees F) and low temperature protection (to -30 degrees F)
Mobil 1 is specially formulated to help remove sludge and lower engine temperatures

Show Price

Deals are Live

Special Amazon deal ends in: