Castrol GTX Full Synthetic 5W-30 Motor Oil
5 Quarts
Price as of 2026-06-03. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$6–$23
- Mid-range:$23–$39← You are here
- Premium:$39+
Is This Right For You?
- •Those who want a top-rated option — in the top 19% of Motor Oil by rating
- •Castrol loyalists — the brand spans 62 products in our database
- •STP Premium Small Engine 4 Cycle Oil Formula — 52% cheaper at $14 (Score A)
- •Motul 7100 4T 10W-40 Full Synthetic Motorcycle Oil — higher rated at 4.9/5 ($70)
📊 Based on data analysis of 58 products in this category.
Mubboo Score: A-
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other Motor Oil
Computed from live Amazon rating, review count, and price across 58 Motor Oil available to US consumers · last refreshed 2026-06-03.
How It Compares
This Product Castrol GTX Full Synthetic 5W-30 Motor Oil | Most Popular Valvoline MaxLife High Mileage 5W-30 Synthetic Blend Motor | Best Rated Motul 7100 4T 10W-40 Full Synthetic Motorcycle Oil | Best Value STP Premium Small Engine 4 Cycle Oil Formula | |
|---|---|---|---|---|
| Price | $29.28 | $19.97 | $69.96 | $13.99 |
| Rating | 4.8/5 | 4.8/5 | 4.9/5 | 4.8/5 |
| Reviews | 3,765 | 27,740 | 7,632 | 3,256 |
| Mubboo Score | A- | A+ | B+ | A |
Quick Specs
- Size
- 5 Quarts
- Manufacturer
- Castrol
- Model Number
- 15E6DE
- Liquid Volume
- 5 Quarts
- Container Type
- Bottle
- Item Type Name
- Full Synthetic Motor Oil
- Customer Reviews
- 4.8 out of 5 stars
- Best Sellers Rank
- #159 in Automotive (See Top 100 in Automotive)#8 in Motor Oils
What People Say
Synthesized from 40 reviews · 100% verified purchases.
For older engines, high-mileage oils like Valvoline MaxLife can help reduce leaks and noise. Compare final cost as Amazon purchases may not qualify for manufacturer rebates, and note Castrol EDGE’s eco-pack can be harder to pour than jugs.
- Improved engine smoothness and quietness
- Good value and competitive price
- Dependable and reliable performance
- High mileage engine benefits
- Inconvenient eco-pack packaging
- No rebate eligibility on Amazon
Related Video Reviews
Key Features
- ✦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
- ✦*As measured in Sequence VH sludge test vs. API SP limits
Source: product listing on Amazon.
About Castrol
- 62 products in our database
- Average rating: 4.8/5 across all products
- Price range: $12.99 – $187.25
- Categories: brake-fluids, Fuel Additives, Motor Oil, transmission-fluids
If not the GTX Full Synthetic 5W-30 Motor Oil, consider these
Bottom Line
Castrol GTX Full Synthetic 5W-30 Motor Oil earns Mubboo Score A-. Priced at $29 — a mid-range option, below the category average of $32. Rated 4.8/5 from 3,765+ reviews. Strong buy if: those who want a top-rated option, castrol loyalists.
Frequently Asked Questions
Is the Castrol GTX Full Synthetic 5W-30 Motor Oil worth buying in 2026?
It earns a Mubboo Score of A-, with a 4.8/5 rating from 3,765 reviews — better than 81% of Motor Oil we track.
How much does the Castrol GTX Full Synthetic 5W-30 Motor Oil cost?
It is currently $29.28 — mid-tier pricing for Motor Oil.
How does the GTX Full Synthetic 5W-30 Motor Oil compare to other Motor Oil?
The category's most-reviewed alternative is the Valvoline MaxLife High Mileage 5W-30 Synthetic Blend Motor (4.8/5, 27,740 reviews, $19.97). The GTX Full Synthetic 5W-30 Motor Oil carries a Mubboo Score of A- vs A+.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-06-03) and may change.