Castrol 0W40 vs. Mobil 1 0W40: Which One Will You Prefer?

Healthy engines perform so well that we can surely take the vehicle anywhere. And synthetic oils are good food for these engines. If you think of quality oils, you may find Castrol and Mobil 1 on top in most search results. Both oils go well with most vehicle engines. Still, some distinctions are there between these two oils. In this blog, I will focus on Castrol 0W40 vs. Mobil 1 0W40 to discuss those differences.

Well, both oils have a good buzz in the automotive industry. Deep down, Castrol 0W40 is good for its ability to help engines perform at their best (1). It may perform better in hot temperatures. Alternatively, Mobil 1 0W40 is praised for its excellent overall performance (2). Your car engine may perform better in colder areas using this oil.

Feeling curious? I have just given you a hint of the differences between 0W40 oils from Castrol and Mobil 1. In the rest of this blog, a lot of things are waiting for you – just to help you decide between these two quality oils. And I hope you will for sure read the whole post.

Similarities Between Castrol & Mobil 1

Before I explain the differences, I must explain what “0W40” means and why it stands with brand names. Many brands sell this oil (0W40 or 0W-40) to their customers. In return, they get huge popularity for their efficiency in versatile engines.

0W40 refers to one of the viscosity grades (thickness) of any oil according to the SAE classification (3).Thus, the “W” in the oil’s viscosity description is “Winter”. And numbers before and after it refer to the oil’s weight and thickness, or viscosity. These numbers can be different, like 5W30, 10W30, 20W50, etc.

 “0” (zero), before “W” indicates that the oil is formulated to flow like a 0-weight oil in cold conditions. Then again, “40” refers to the viscosity of a 40-weight oil once full operating temperature has been achieved.

In terms of Castrol and Mobil 1’s 0W40 oil, these are multi-grade oils.They work well in winter conditions and moderate summer heat (4). Moreover, these oils are better than 5W30 in both winter and summer. The lower the number before “W”, the better the oil performs at lower temperatures.

Using any 0W40 oils from Castrol or Mobil 1 will flow well at lower temperatures. Also, they will remain adequately thick or strong to protect the engine at higher temperatures (5).Engines remain well-protected from any wear over time as these oils reduce friction.

European vehicles like Mercedes-Benz, Porsche, and Volkswagen prefer 0W40 engine oils. American car manufacturers also choose it for high-performance engines in cars and pickup trucks (6).

Castrol 0W40: Reliability, Features, & Benefits

I guess I do not need to talk a lot about Castrol. This brand has been winning hearts for more than a century. Plus, they give you multiple grades and types like synthetic and high-performance oils.

In short, Castrol 0W40 flows like 0 Weight oil in winter temperatures. But it has a viscosity of 40-weight engine oilwhen the engine gets full operating temperature. Together, it offers high-level engine protection from ignition (7).

It features TITANIUM FST technology that doubles its film strength. This technology prevents oil film breakdown and reduces friction. So the engine can give its best performance (8).

When you apply Castrol 0W40 oil in your engine, it will decrease the deposit formation. So, your engine will response to its maximum ability (9).

According to O’Reilly, it is 3x stronger than conventional and Mobil 1 oils against viscosity breakdown. It also ensures that all engine components (from the valve train to the bearings) remain fully lubricated. So, your engine will provide optimum engine performance and protection.

Canada’s Store says Castrol Edge 0W40 neutralizes the engine acids that cause rust and corrosion. It gives the machine advanced power, superior protection, and performance. Ideally, you can prefer this synthetic oil in petrol and diesel passenger and light commercial vehicles.

Mobil 1 0W40: Reliability, Features, & Benefits

If you think of high-quality motor lubricants, Mobil 1 is a strong contender for Castrol. This brand has a rich history of providing high-quality lubricants for various engines.

Well, Mobil 1 0W40 is a fully high-performance synthetic motor oil. It keeps the engine running like a new one. Besides, it has a proprietary blend of synthetic base stocks revived with a strictly balanced component system (2).

Let’s talk about the efficiency of Mobil 1 0W40 oil. It is compatible with cars with the latest gasoline and diesel engine technologies. Also, you can choose it for exceptional cleaning performance, wear protection, and stability. In short, you will experience overall engine performance for its long-lasting power.

It has excellent low-temperature capabilities. When you use it, the engine will get rapid protection at start-up.  Additionally, the enhanced frictional properties aid fuel economy. Like Castrol, this Mobil 1 0W40 oil can reduce the stress of daily wear and harsh conditions for longer engine life. It can prevent the buildup of contaminants and sludge to keep the engine cleaner.

Comparative Analysis: Castrol 0W40 vs. Mobil 1 0W40

So you have a clear overview of both oils. In this part, I will explain the precise differences between these two brand oils with the same viscosity grade.


Castrol 0W40 is engineered with fully synthetic and the latest additive technology. It protects the engine from wear, deposit, and oxidation. On the other hand, Mobil 1 0W40 is noted to perform better in colder areas.

Temperature Tolerance

Mobil 1 0W40 stands out for its exceptional low-temperature performance. So, if you live in colder areas, you can choose it. Alternatively, Castrol 0W40, with its Titanium Technology, ensures maximum engine performance even under pressure. So, you can choose it for cars operating under high loads or extreme conditions.

Engine Protection

Both Castrol and Mobil 1 0W40 protect the engine from wear. While researching this topic, I have found that these oils reduce friction between the engine’s moving parts. So, your vehicle engine gets extended life.


Castrol’s 0W40 oil, specifically the Castrol EDGE Extended Performance, guarantees protection for up to 20,000 miles between oil changes(10). However, Castrol EDGE Full Synthetic Motor Oil suggests a long drain cycle of up to 10,000 miles between oil changes. It aligns with the interval recommended by many vehicle manufacturers (11).

Mobil 1 0W40 synthetic oil allows for maximum oil drain intervals up to 20,000 km. But you should follow your car’s OEM Manual for specific oil drain interval (ODI) applications (12). One thing to mention is that the oil change interval is 5,000 miles(shortest) and 15,000 miles (longest) (13).

Industry Approvals

0W40 from Castrol and Mobil 1 meets or exceeds the latest OEM and industry approvals. You can use Castrol 0W40 oil in both gasoline and diesel engines. Use it if your car manufacturer recommends using an ACEA A3/B4, API SN/CF or earlier specification (14).

Many of the world’s finest vehicles have chosen Mobil 1 0W40 for factory fill (15). Like Castrol 0W40, it also meets or surpasses specs like ACEA A3 / B3 / B4, API SJ/CF, and SH/EC II. Even it approves of BMW Longlife, Mercedes Benz Sheet 229.3, Porsche, and VW 502.00 / 503.01 / 505.00 (16).


The current price of Castrol and Mobil 1 0W40 motor oil varies depending on the retailer and the quantity. It’s important to note that prices may vary by region and availability.

Below prices are shown when I was writing this blog:

  • A 5-quart jug of Castrol EDGE Euro 0W-40 A3/B4 Advanced Full Synthetic Motor Oil is priced at $32.99 on Amazon (17). Walmart is reported to charge the same for the same quantity (18).
  • Canadian Tire offers a 1-liter bottle of Castrol EDGE 0W40 Synthetic Engine/Motor Oil for $19.99 (19).
  • On Amazon, a 6-quart pack of Mobil 1 0W-40 is priced at $54.30 (20), while a 1-quart bottle is listed for $43.49 (21)
  • Walmart offers a 5-quart pack of Mobil 1 FS European Car Formula Full Synthetic Motor Oil 0W-40 for $89.88 (22).
  • SamsClub sells a 6-pack of 1-quart bottles of Mobil 1 FS 0W-40 Synthetic Motor Oil for $43.48 (23).
  • A 12-quart pack of Mobil 1 FS European Car Formula Full Synthetic 0W-40 Motor Oil is available for $49 on (24).

Conclusion: Castrol 0W40 vs. Mobil 1 0W40

So, you can see both oils are great with their features and significance. But the question is which one you should prefer. Upon my research, I suggest you pick both oils but keep certain factors in mind.

If you live in a colder area or drive a car under high loads or extreme conditions, Mobil 1 0W40 will be the better choice. It can provide better low-temperature performance. But this oil is slightly pricier than Castrol 0W40.

On the other hand, Castrol 0W40,with its Titanium Technology, is better for high-performance engines. It can withstand extreme temperatures during the hot seasons. Besides, you can save more money on it.

Now, it’s up to you! Do you want to save money or keep your oil viscosity good in winter? I hope you have made your plan.

Thanks for reading this blog.

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