Castrol Edge vs. Mobil 1: Full Synthetic Oils Comparison

Jerry Wilson
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Castrol Edge Overview

Castrol Edge is the newest entry in the full synthetic category of motor oils. It is part of the EP line of Castrol synthetic oils. This additive package was created for the unique needs of sensitive European car engines. According to some tests, for certain vehicles, this oil can be used as a critical life of the engine oil. It is formulated to withstand low temperatures and protect against pitting under extreme conditions.

Castrol Edge has a fully synthetic formula that surpasses the ASTM specifications for full synthetic motor oil. It has a high viscosity index of 145, which reduces engine friction at startup. It also contributes to reducing piston deposits and wear, keeping all engine surfaces clean. Castrol Edge has a friction modifier that reduces engine noise, which makes your car quieter while improving your gas mileage.

The concentration of EP additives protects against rust and oxidation by creating a film on metal surfaces that protects them from corrosion. It has more than twice the detergency of other brands, which helps to protect engine surfaces from wear and harmful deposits.

Castrol Edge is available in both full synthetic and semi-synthetic versions, for use in both gasoline and diesel engines. It is recommended for vehicles that require synthetic motor oil and that are manufactured after 2006 to be used as an OEM/factory replacement.

Mobil 1 Overview

Mobil 1 first made its way onto car shelves in 1972, nearly 46 years ago. The manufacturer was determined to make a synthetic oil that was superior to all the conventional options on the market.

To meet this goal, they hired a team of PhDs, chemists, and other scientists who were able to develop a plant-based oil that didn’t contain dyes, silicones, or any other harmful ingredients.

The next step after the original oil was the introduction of a synthetic oil designed specifically for racing cars. This took 12 years to develop, but when it was finally released, the oil was approved by the world’s most powerful racing organizations.

The manufacturer then expanded their product line to include conventional oils for everyday drivers and went on to create engine oil that was safe for longer drain intervals.

Mobil 1 is a full lineup of synthetic oils, now, with each having a specific purpose. The SAE V-Twin is designed for motorcycles, for instance, and the Extreme 3000 is designed specifically for driver who want to go long distances without having to change the oil. Read more about each variation of Mobil 1 in the link.

Mobil 1 Group of Oils

Mobil 1 is a full lineup of different oil blends. However, there are three main categories of Mobil 1 oils.

Comparison Chart

Flash Point, Open Cup (°C (°F).

TBN (mg KOH/g)

{1}. 1 (20°C (68°F))
{2}. 5 (20°C (68°F))
{3}. 9 (20°C (68°F))
{4}. 5 (20°C (68°F))

  • 5 (23°C (73°F))
  • 0.5 (23°C (73°F))

Castrol Edge vs. Mobil 1

Full Synthetic Oils Comparison

Castrol Edge Motor Oil

For full synthetic motor oil, Castrol Edge Syntec is one of the leading brands on the market. It comes in a variety of viscosities, including 5W-20, 0W-20, and 0W-30. Other viscosities available include 5W-30 and 10W-30.

Castrol Edge motor oil has been especially developed for new cars. It meets car maker requirements and exceeds VOC emissions levels. It also has massive anti-corrosion protection and is designed to maximize the quality and life of your engine. In its synthetic form, it is designed to work for longer and to be less expensive to use in the long term. Castrol Edge motor oil is available for all cars, SUVs and trucks.

One of the most important things about this Castrol product is that when you purchase it, you’re buying into a brand that’s been around since 1876. Castrol is one of the most well established motor oil brands in the world, and that is an important consideration when you’re buying this type of product.

Castrol Edge vs. Mobil 1: Full Synthetic Oils Comparison


Castrol Edge outdid every other oil on our list in every category but one. Socially responsible, not only does it have a manufacturing location in the UK, but Castrol oil is involved in numerous charities and sponsorship in the UK sporting community. Mobil 1 is currently the official oil of the National Hot Rod Association, along with being used by the most successful Formula 1 factory teams and NASCAR teams. While Castrol did well, both oils came up short on some key points. Edge received a higher overall review score, but Mobil 1 did slightly better in the wear protection category. Even the price of Mobil 1 is almost half that of Castrol Edge Synthetic.

For those reasons, we have to go with Mobil 1 10W-30 as the overall Winner of the group.