This synthetic oil works great, and has an extremely low price tag. It quickly outperforms other 5W-40 motor oils, but it's a little pricey.
Amazon Basics High Mileage Motor Oil
Amazon Basics motor oils are inexpensive, but they won't rust your engine or cause other engine problems. They are good enough to use when the vehicle is newer, but may not be the best for older ones.
Mobil 1 Extended Performance (120766) Extended Performance 5W-30 Motor Oil
It is marketed as a high-performance motor oil, but we found that it performed more like an average motor oil. We recommend sticking with the manufacturer's recommended oil for your specific vehicle.
Castrol 03559 Edge 5W-30 C3 Advanced Full Synthetic Motor Oil
One of the most expensive engine oils we tested, but the best at maintaining engine cleanliness and protecting from wear.
Castrol 03124 Edge 0W-20 Advanced Full Synthetic Motor Oil
Castrol is our top pick for motor oils, which is especially noteworthy, since we test engine lubricants. The Edge 0W-20 oil may not protect the engine as well as higher-priced oils, but it provides outstanding engine and fuel economy protection.
Royal Purple 51530 High Performance Motor Oil 5W-30 (5QT)
We liked the increased wear protection that this oil offered. The oil is a little more expensive than the cheaper options we tested, but we liked the protection it offered.
Castrol 03111C GTX High Mileage 10W-40 Synthetic Blend Motor Oil
This synthetic blend oil made our list because it's less expensive than many conventional oils, but also outperformed them when we tallied the cost and performance of each.
Quaker State 550044965 Motor Oil
The recommended brand is more expensive, but this synthetic blend oil met or exceeded all manufacturer requirements in most of our tests. We did find one big drawback, however. It tended to spew more oil than competing oils.
This conventional motor oil was a cheap, inexpensive option that was acceptable for engines that don't need the additives in pricier synthetic motor oils.