EDGE 5W-20 Advanced Full Synthetic Motor Oil, 1 Quart, Pack of 6

Castrol Edge 5W-20 is a premium full synthetic motor oil touted for its strength and performance. I'm a driver who values both, so I put it to the test in my daily driver. Here's the verdict: Pros: Smoother Operator: The first thing I noticed was a significant improvement in engine smoothness. Gone was the slight roughness at idle, replaced by a purring refinement that had me smiling behind the wheel. Power Unleashed: Acceleration felt sharper, with the engine responding more eagerly to throttle inputs. The claimed reduced friction seemed to translate into real-world driving. Thermal Titan: Even during hot days, the oil temperature remained remarkably stable. No worrying oil breakdown or engine overheating – just cool confidence behind the wheel. Extended Endurance: The promise of extended oil change intervals is tempting, but I'll stick to my manufacturer's recommendations for now. However, knowing the oil can handle longer intervals is reassuring for occasional road trips. Cons: Pricey Potion: Castrol Edge is definitely not the cheapest oil on the shelf. But for the performance and peace of mind it provides, the premium might be worth it for performance-driven drivers. Not for Old Timers: While great for modern engines, Castrol Edge might not be the best choice for older, high-mileage vehicles. Consult your owner's manual or a mechanic for specific recommendations. Overall: Castrol Edge 5W-20 is a clear winner for drivers who demand the best for their engines. It delivers noticeable improvements in smoothness, power, and thermal stability, making it a worthy investment for those who prioritize performance and protection. Just be prepared for the premium price tag. Happy driving!

I’ve been buying Castrol EDGE 5W-20 Advanced Full Synthetic Motor Oil for years, and it has never disappointed. The EcoBox packaging is excellent—every order has arrived without any damage. What I really appreciate is the thoughtful design: the cardboard outer box is fully recyclable, and the inner plastic bag makes disposal easy and takes up very little space in the trash. It’s a smart, eco-friendly solution that doesn’t compromise convenience. The oil itself performs exactly as expected, providing top-tier protection and performance for my engine. I follow the recommended oil change interval of every 6 months or 5,000 miles, whichever comes first, and this oil has consistently delivered great results. Overall, great product, great packaging, and a brand I trust. Highly recommended! Pros Excellent engine protection and performance EcoBox packaging is durable and arrives undamaged Cardboard box is recyclable Plastic bag is easy to dispose of and saves space in trash Trusted brand with consistent quality Works perfectly for 6-month/5,000-mile oil change intervals Cons None for me so far Quick Tip: Store the EcoBox upright to avoid leaks after it is opened.

Just was a good price, and came quickly.

5 stars

I tried to make an informed purchase by looking at the different oil manufacture websites for a breakdown of what's in their products. However, all I got were buzzwords like "High Performance", "SynPower", "Full Synthetic", and for this product, "Edge with Syntec Powered Technology" And when I find their product data sheet, they labeled their additives as "proprietary." This kind of secrecy reminded me of how food companies used the word "spices" in their ingredient list. Then I read reviews from other car owners and all I got were anecdotal experiences, such as "my car is performing better" or "It's amazing. I believe 100% in this product!" Despite the lack of concrete information, I went ahead and purchased this product, and then I paid an oil analysis laboratory to get some hard facts. Not surprisingly, "Syntec" is no where to be found in the oil. To save you some Googling, I included a brief explanation in the additives break-down below (units are in ppm and the values in parentheses are universal averages for 5W-20 oils): Calcium [detergent/anti-corrosion]: 668 (1903) Magnesium [detergent/anti-corrosion]: 1413 (71) Phosphorus [anti-wear]: 705 (647) Zinc [anti-wear]: 818 (756) Molybdenum [anti-wear]: 72 (73) Boron [anti-wear]: 65 (82) The most interesting thing about Castrol Edge with Syntec is the reliance on magnesium as the main detergent/anti-corrosion agent. This is typically seen in oils designed for diesel vehicles. The other interesting thing to note is the above average zinc count. Zinc is known to degrade catalytic converter performance, and since I live in California, this is a problematic issue due to the state's strict emission regulations. The other important characteristic of engine oils is Total Base Number (TBN). This value indicates the amount of anti-corrosion (acid neutralizers) additives are in the oil. It is an important indicator of the service life of the oil. The TBN for my unused oil sample is 10.7, which is above average. It is important to note that TBN does not decline at a constant rate, and the rate of decline is different for each oil type and rating, as well as driving habits and conditions. With this is mind, I went ahead and performed an used engine oil analysis at 8,510 miles and the sample came back with a TBN of 4.0. Oil change is usually recommended when the value is 3 or less. The lab recommended that I can shoot for an oil change at 10,500 miles. I'll post an analysis of that oil change when the car reaches that threshold. Last, but not least, is the physical characteristics of the oil. And this is where the synthetic nature of this oil gives it an advantage over conventional oils. Synthetic oils maintain their viscosity ratings longer and more consistently than conventional oils. My unused oil measured 8.50 centistokes (cSt) at 100°C and it was reduced to 8.41 cSt after 8,510 miles. Both values were well within the viscosity rating of 20. In conclusion, based on the oil analysis and the performance of my engine with this oil, I give Castrol Edge with Syntec 4 stars. It will get another star if my next oil change at around 10,500 miles shows good results. I hope my review provided you some of the data you need to make an informed purchase. Please remember that my review is based on two samples and a lot more are needed to make a conclusive observation. **Update: 7/30/2014** The lab result for the oil change done at 10,500 miles shows really good results. In fact, the TBN is higher (at 5.5) Because of this, it is recommended that I can shoot for an oil change at 12,000 miles. **Update: 4/26/2015** Looks like the marketing department is at it again. They figured that they could drop the byline, "with Syntec Powered Technology" and just call it "Edge" (¬_¬)

Its oil. It isn't cheaper by the box verse the jug and you really can't put the used oil back in the bag/box to take it in to get it recycled. Makes a huge mess if you try and pour from the box. You can get deals for multiple boxes. Cheaper than going to the garage though and no waiting.

I’ve been using Castrol EDGE 5W-20 Advanced Full Synthetic Motor Oil for a while now, and I’m thoroughly impressed! While it's rated for up to 20,000 miles, I prefer changing my oil every 5,000 miles for peace of mind, knowing I’m giving my engine the best care. This oil provides excellent protection, ensuring smooth engine performance, even in extreme conditions. The full synthetic formula gives me confidence that my car is running efficiently and helps maintain optimal fuel economy. The 5-quart bottle is the perfect size for my regular oil changes, and it’s an excellent value for the price. Excellent protection and performance Full synthetic for smoother engine operation Great value in a 5-quart size Helps maintain fuel economy and engine longevity Highly recommend this oil for anyone wanting to extend engine life and optimize performance!

What can I say? Castrol makes great oil and you save a bunch of money changing it yourself. Don’t forget to buy quality filters (I’m a WIx fan personally) and be certain to buy the right weight oil for your vehicle.