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Item #:
220318393
Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quarts
86% of respondents would recommend this to a friend
Item #:
220318393
€ 74
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Order now and get it around Friday, September 04
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What Stands Out
High Mileage Formula
Specially designed for vehicles with over 75,000 miles, this oil helps reduce wear and tear while improving engine performance and extending engine life.
Synthetic Blend
Combines synthetic and conventional oil, offering superior protection and performance compared to standard motor oil, catering to a wider range of driving conditions.
Convenient Packaging
Comes in a pack of three 5-quart bottles, ensuring you have enough oil on hand for multiple oil changes without frequent trips to the store.
Product Details
| Brand Name | Castrol |
| Manufacturer Part Number | 03100C |
| UPC | 079191231005 |
| Number of Packs | 1 |
| Global Trade Identification Number | 00079191231005 |
| Manufacturer | Castrol |
| Size | 5 Quarts |
| Unit Count | 160 Fluid Ounces |
| Included Components | Motor Oil |
| Item Type Name | Motor Oil |
| Model Number | 03100 |
| SAE J300 Viscosity Grade | 5W-20 |
| Container Type | Bottle |
| Compatible with Vehicle Type | For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs |
| Viscosity Level | Medium to High |
| Automotive Fit Type | Universal Fit |
| Liquid Volume | 160 fluid ounces |
| Brand | Castrol |
| Package Information | Bottle |
| Vehicle Service Type | For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs |
| Item Weight | 4.5 lbs (2.04 kg) |
Who Should Buy?
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Older Vehicles
Ideal for cars with over 75,000 miles needing extra protection and reduced oil consumption.
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Frequent Drivers
Great for users who drive regularly, helping to maintain engine health and performance under continuous use.
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Preventive Maintenance
Perfect for those who conduct regular maintenance and want to prolong engine life with high-quality oil.
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High-Performance Cars
Not suitable for high-performance, high-revving engines that require fully synthetic oils for optimal performance.
Product Description
Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quarts
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Customer Questions & Answers
-
Question:
What are the benefits of using Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil?
Answer: Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil offers enhanced protection for older vehicles with over 75,000 miles. Its formula includes specially designed additives that help reduce engine wear, protect against sludge, and minimize oil consumption. Additionally, it contains seal conditioners that rejuvenate gaskets, preventing leaks. Using this oil can improve your engine's performance and prolong its lifespan, making it an ideal choice for used cars or trucks that need extra care. -
Question:
How often should I change Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil?
Answer: It's generally recommended to change your motor oil every 5,000 to 7,500 miles when using synthetic blends like Castrol GTX High Mileage 5W-20. However, consult your vehicle’s owner manual for specific intervals that may vary based on driving conditions. Regular oil changes using this product can help maintain optimal engine function, especially in older vehicles, thereby ensuring smoother performance and reducing the risk of engine issues. -
Question:
Is Castrol GTX High Mileage 5W-20 compatible with all vehicles?
Answer: While Castrol GTX High Mileage 5W-20 is suitable for many vehicles, it is specifically designed for cars and trucks with over 75,000 miles. It's crucial to check your owner’s manual to confirm that a 5W-20 viscosity is recommended for your engine. This oil can be particularly beneficial for higher mileage vehicles by providing additional protection and performance, making it a favored option among car owners looking to extend the life of their engines. -
Question:
What makes synthetic blend oil better than conventional oil?
Answer: Synthetic blend oils, like Castrol GTX High Mileage 5W-20, combine conventional oil with synthetic base stocks, resulting in a product that offers superior performance and protection. These blends provide enhanced thermal stability, better resistance to oxidation, and improved low-temperature fluidity. This means that synthetic blend oils can work effectively at extreme temperatures, delivering optimal engine protection and performance under various driving conditions. They also tend to last longer than conventional oils, providing better value in maintenance. -
Question:
Can I mix Castrol GTX High Mileage 5W-20 with conventional oil?
Answer: Mixing Castrol GTX High Mileage 5W-20 Synthetic Blend with conventional motor oil is generally not recommended. While mixing may not cause immediate problems, it can diminish the performance benefits of the synthetic blend. For optimal protection and performance, it’s best to use it exclusively. If you find yourself in a situation where you need to top off your oil with conventional oil, try to minimize the amount and subsequently schedule an oil change with the synthetic blend to ensure your engine receives the full benefits. -
Question:
What types of engines benefit the most from Castrol GTX High Mileage 5W-20?
Answer: Castrol GTX High Mileage 5W-20 is particularly beneficial for older engines or those with high mileage, usually over 75,000 miles. It is designed to address common issues faced by such engines, including oil leaks, increased engine wear, and sludge buildup. Vehicles that perform in extreme conditions, such as frequent stop-and-go driving or high-heat environments, also see significant advantages from this motor oil. Essentially, if your vehicle is showing signs of aging or wear, using this oil can help maintain its performance. -
Question:
What does the '5W-20' in Castrol GTX High Mileage 5W-20 mean?
Answer: The ‘5W-20’ designation refers to the oil's viscosity ratings, indicating its thickness and flow characteristics at different temperatures. The '5W' signifies the oil's performance in cold conditions, meaning it flows well at low temperatures for quick lubrication during cold starts. The '20' indicates its viscosity at higher temperatures, offering proper protection under engine operating conditions. Thisviscosity grade is optimal for many modern engines, ensuring balanced protection and efficiency across a range of temperatures. -
Question:
How does Castrol GTX High Mileage prevent engine leaks?
Answer: Castrol GTX High Mileage includes seal conditioners that help maintain and restore the flexibility of engine seals, which can dry out and crack in older vehicles. By rejuvenating these seals, it significantly reduces the risk of oil leaks. This is particularly important for cars with high mileage, where leaks can become more common as the engine components wear. Using this motor oil not only aids in minimizing leaks but also helps maintain engine integrity, thus extending the life of your vehicle. -
Question:
Does Castrol GTX High Mileage 5W-20 offer any fuel efficiency benefits?
Answer: Yes, using Castrol GTX High Mileage 5W-20 can help improve fuel efficiency in older engines. Its advanced formulation reduces friction and engine wear, allowing the engine to run more smoothly and efficiently. With less internal friction, the engine consumes less fuel, which translates into better mileage. This is particularly advantageous for drivers of high-mileage vehicles looking to reduce fuel costs while ensuring their engine operates optimally. -
Question:
Where can I buy Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quarts, Pack of 3?
Answer: You can purchase Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quarts, Pack of 3 from Ubuy in Ireland. Ubuy is a reliable online retailer that offers a variety of automotive products, including this synthetic blend motor oil, making it easy for you to find and buy the products you need for your vehicle.
Castrol Motor Oils 03100 Editorial Review
**** Castrol GTX High Mileage 5W-20 Synthetic Blend Motor Oil has garnered positive feedback from customers, particularly for its performance and economic value. This oil is especially favored by owners of older vehicles that have high mileage, as it assists in managing oil Consumption effectively. Users have noted that it provides a solid option for those looking to maintain their vehicles without heavy financial repercussions. The practicality of the product is highlighted by its packaging—it comes in a manageable 5-quart container that makes it easy to handle during oil changes. Many customers appreciate the cost savings associated with purchasing this pack of three, as it is a more economical choice compared to buying individual quarts. Despite some hesitations regarding price fluctuations in the market, users express confidence in the oil's efficacy, assuring others that it gets the job done without issues. Overall, Castrol GTX High Mileage 5W-20 has been well-received for its performance, affordability, and convenience, making it a preferred choice for those with aging vehicles. **
Customer Reviews & Ratings
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Pros
- Excellent value for the price.
- Suitable for high-mileage vehicles.
- Convenient 5-quart container for easy handling.
- Cost-effective bulk purchasing option.
Cons
- Minor concerns about fluctuating prices in the market.
Platform Trust & Buyer Confidence
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Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
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“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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23 July 2026 · via Trustpilot
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Top selling High Mileage Motor Oil in Ireland
Last Updated on August 26, 2026
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€ 74
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Features & Benefits
- Specially formulated for engines with over 75,000 miles
- Protects against sludge, wear, and burn off
- Reduces phosphorus to protect the emission system
- Superior oil burn off protection compared to conventional oils
- Seal conditioners help reduce leaks
- Exceeds ILSAC GF-5, API SN standards
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