A good opion of a synthetic oil can make many problems of your car, motorcycle or truck disappear before you spend a lot of money in a auto shop “fixing” it; instead pick the best synthetic oil. Great synthetic oils can work both on gasoline and diesel vehicles and they have much more efficient viscosity than conventional oil. Let’s head to our top 5 list with the best synthetic oils out there in the market and why they are so great.

PictureNameDiscount Link
Rotella T6 5W-40 Full SyntheticDiscount Link
Mobil 1 20W-50 V-TwinDiscount Link
Red Line 75W90 Synthetic Gear OilDiscount Link
Royal Purple HPS 5W-30Discount Link
Castrol Power RS 10W-40Discount Link

Our Top Reviews: Best Synthetic Oil

Rotella T6 5W-40 Full Synthetic

 Shell Rotella (550019921) T6 5W-40 Full Synthetic, Heavy Duty Diesel Engine Oil (CJ-4) - 1 Gallon

The Shell Rotella is a sensation among customers because this is one of the most versatile formula yet developed by. While it is sold for diesel based vehicles, customers find out the oil works great on gasoline cars and motorcycle, especially for drivers who are competing on automotive sports. Since 2011 the T6 5W40 is a favorite one capable to boost your vehicle beyond expectations.

  • One of the ultimate formulas of Rotella
  • Less ashes, for heavy duty function
  • High protection against soot, dirt and other elements that can contaminate the engines
  • Highly resistant to heat and extremely efficient for extreme weather, will make the car start under even -30 degrees Fahrenheit

5 stars on sites like Amazon.com from over 200 different buyers. That means a lot since only 1 gallon of this synthetic oil costs almost $20.

Mobil 1 20W-50 V-Twin

 Mobile 1

This is another example of an oil that is designed especially for one kind of vehicle but can be used for any one. This Mobil formulation is special for motorcycles, but can be used as well by car, trucks and any other engine related vehicles.

  • Improved to offer protection under very high RPM speeds
  • Exceeds the requirements of API Service Categories SH, SG/CF, providing extremely efficient horsepower and acceleration
  • Will protect engines from extreme temperatures breakdown from cold to hot
  • Coat engines from the accumulation of dirt and other contaminants

Another 5 stars oil, rated on Amazon from over 200 different buyers. This synthetic oil  is also an expensive one, around $16 each quart.

Red Line 75W90 Synthetic Gear Oil

 Red Line 57905 75W90 GL-5 Gear Oil - 1 Gallon

Red Line is a synthetic oil developed especially for racing cars and light trucks, so you can make use of it on your own car and even compatible motorcycles with the 75W90. This oil is terrific for high speeds.

  • Contains friction modifier and so can be used in many transmissions and transaxles
  • Natural multigrade property, provide a stable viscosity for even extended periods of use
  • Provide excellent lubrication under extreme conditions of high-loading and high-temperatures
  • Reduces sliding friction to reduce wear and temperatures

Another 5 stars. Each quart costs around $16.

Royal Purple HPS 5W-30

Royal Purple 36530-6PK HPS 5W-30 Synthetic Motor Oil with Synerlec Additive Technology - 1 qt. (Case of 6)

This Royal Purple formula is one of the most flexible out there in the market, being able to be used on both cars, motorcycles and trucks on heavy duty. While this synthetic oil like many others of our list are ideal for races, using this on domestic vehicles has an outstanding performance.

  • Has a mix of Zinc/Phosphorus Anti-Wear and Synerlec technology, which enables the use of this formula for both gasoline and diesel vehicles
  • The exclusive additives are viscous enough to protect light to heavy engines from wear and dirt contamination
  • Works both on gasoline and diesel engines

Another 5 stars product. The rate on Amazon is from over 300 different buyers. The product costs around $10 only each quarter.

Castrol Power RS 10W-40

Castrol 06078 Power RS 10W-40 4-Stroke Motorcycle Oil - 1 Quart Bottle

  • Implements the Trizone technology, protecting engines, clutch and gearbox
  • Works with both air-cooled performance and water-cooled engine performance
  • Developed for race performance, with great viscosity and prevention of viscosity breakdown to allow higher resistance to temperature oscillation

5 stars on Amazon.com. This one is the most affordable of our list. 1 quarter costs around $7 on promotional sale.

Tips to Buy The best Synthetic Oil

Synthetic oils are really fit for any kind of vehicle?

While they are much more compatible to work with a lot of different vehicles, things are not that simple. As we mentioned in several items of our list, many of these synthetic oils are designed for one or other kind of vehicle but they end up working great with another. Before you jump to conclusions, always check with the manufacturer of your car or professionals that are skilled about your model of car whether one or other product of your interest will work on your car for sure.

Should I buy Units or packs?

You will see around the web many promotional offers where you can find a pack of 6 or more of a synthetic oil with a discount. On the other hand, is better to purchase first 1 quarter or gallon and test it on your vehicle. While it is much more cost saving to buy on promotional offers, you have to be sure all that pile of oil will really work with your vehicle.

Should I try oils of thinner viscosity than the one I currently use?

Each vehicle works better with a degree of viscosity. While many will say that the thinner the oil the better it will work, things are not that simple. While engines, gear, transmission will work smoother, certain cars and trucks, for example, require a specific viscosity degree so the oil can coat these parts and work protecting them. If your can can’t endure an oil too thin, there might be leakage and you might need to apply it more often, wasting money and taking the risk to let something uncovered and unprotected on your car. Always stick to the standards of your manufacturer to avoid bad surprises.

Viscosity Function Fuel
Rottella 5W-40 Engine oil Diesel / Gasoline
Mobil 20W-50 Engine oil Gasoline
Red Line 75W90 Gear oil Gasoline / Diesel
Royal Purple 5W-30 Engine oil Gasoline / Diesel
Castrol 10W40 Engine oil Gasoline / Diesel