Today’s motor oil market is more diverse than ever, so we thought it would be a good exercise to put together some numbers for you. Let’s look at the top selling AMSOIL motor oils at and then let’s chart which engine oil viscosities are the most popular this year from our complete product line.

Here are the top 15 most popular AMSOIL motor oils at

  1. XL 5W-30 Synthetic Motor Oil
  2. Premium Synthetic Diesel Oil 5W-40
  3. XL 5W-20 Synthetic Motor Oil
  4. Signature Series 5W-30 Synthetic Motor Oil
  5. European Car Formula 5W-40 Mid-SAPS
  6. Synthetic Heavy Duty Diesel & Marine 15W-40
  7. Signature Series 5W-20 Synthetic Motor Oil
  8. Premium Synthetic Diesel Oil 15W-40
  9. OE 5W-30 Synthetic Motor Oil
  10. European Car Formula 5W-30 Low-SAPS
  11. Signature Series 0W-20 Synthetic Motor Oil
  12. OE 5W-20 Synthetic Motor Oil
  13. Signature Series 0W-30 Synthetic Motor Oil
  14. OE Synthetic Diesel Oil 15W-40
  15. European Car Formula 5W-40 Full-SAPS

Which Motor Oil Viscosity is Most Popular?

As for the current popularity of each motor oil viscosity, we chose to do so in three categories:

  • Passenger car/light truck/gasoline engine
  • Diesel engine
  • European motor oils

Again these numbers are based on our sales and not necessarily a reflection of the overall industry.

Engine Oil For Passenger Car/Light Truck/Gasoline Engine

In the chart below, you’ll note that 5W-30 motor oil still reigns supreme with a 46.16% share, but when you combine 5W-20 and 0W-20, they capture 43.33% of our sales. So the 20 weight oils are nipping at the heels of 5W-30 and we fully expect that within 2 years, 5W-30 will be in second place and falling. In an effort to optimize gas mileage, automakers are moving to lighter oils like 5W-20 and 0W-20 at a rapid pace. In fact, don’t be shocked to see a 0W-16 on the market in the foreseeable future.

Motor Oil Sales Chart for Gasoline Cars and Trucks

Diesel Engine Oil

In the diesel engine oil category, with a 48.73% market share, 5W-40 garners the most sales on the strength of AMSOIL “DEO” 5W-40 Premium Synthetic. These strong sales are based on two main factors. First, it is suitable for the latest diesel engines requiring an oil with the API CJ-4 spec and is also compatible with diesel engines requiring previous diesel specifications. Secondly, the wide 5W-40 viscosity range allows for excellent winter and summer performance, making it ideal for year-round use. The sales for 15W-40 remain very strong, although we suspect that many diesel owners could benefit from using the 5W-40 year-round rather than using 15W-40 at all.

Diesel Engine Oil Sales Chart By Viscosity

European Car Motor Oil

As European cars are commonly powered by gasoline or diesel engines and as Euro automakers generally have their own distinct engine oil specifications, it seems appropriate to give their engine oils a category of their own. “Full SAPS ” 5W-40 engine oils lead the way with 50.49% of sales, based on the fact that they have been commonly specified over the better part of the last dozen years or so. “Low-SAPS” engine oils are now recommended in many of today’s European cars, so expect Mid-SAPS and Low-SAPS engine oils to change places in these rankings in the next few years.

The definition of “SAPS” is the sulfated ash, phosphorus and sulfur content of a motor oil. The emissions sensors of some cars can be sensitive to these “SAPS” engine oil additives and that is a why a “Low-SAPS” oil may be prescribed by the car-maker.

European Motor Oil Sales Chart