3 Best Oil for Mazda RX8 [Reviews & Buying Guide]

We that you want to provide your gorgeous rx8 nothing but the best. And, getting the best oil for rx8 is an ideal way to take care of it.

Now, there are all sorts of products out there in the market. As a result, it gets even tougher to do the research yourself. That is why we came forward to help you with your search for the best one.

For that, we included some of the best oils and oil filters that you might find. Also, the latter portion of the article describes other technical details. All these details will come in super-handy while purchasing.

So, before anything else, let us take a quick look at the product table below.

Best Oil for RX8 – Comparison Table

Product NameKey FeatureStylePrice
1. Castrol 03102 GTX High Mileage 5W-30 Motor OilBest detergencyHigh-mileage
2. Lucas Oil 10115 Semi-Synthetic 2-Cycle OilGreat wear controlSemi-synthetic
3. Idemitsu Synthetic Blend Rotary Racing PremixRotary fuel lubeSynthetic
4. Mishimoto MMSBH-RX8-04K Oil Line KitPre-labeled identificationSynthetic
5. Genuine Mazda B6Y1-14-302A Oil Filter99.98% filtering efficiencyFull-synthetic

3 Toyota Camry Engine Oil Reviews

Now that we saw the product table, it is time for us to jump into the details. Therefore, here we are going to explain all the products briefly. Apart from the advantages, we will also include the lacking of these products.

1. Castrol 03102 GTX High Mileage 5W-30 Motor Oil

Castrol 03102 GTX High Mileage 5W-30 Motor Oil
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The Castrol 03102 GTX has a ton of features to boost up your engine. You can enjoy the best sludge control with its outstanding detergency. Moreover, the wear protection and the burn-off adds to the benefits as well.

Not just that, the oil acts differently from the other conventional oils. For example, you might need to face an excessive amount of phosphorus in your motor oil. Now, this is a type of catalyst poison.

However, this Castrol 03102 reduces the amount of phosphorus and keeps everything under control. Lastly, the fuel economy takes all the credit and makes it the best engine oil for rx8.

Features & Benefits

Superior detergency

The additives of the oil help you to reduce build-ups. Thus, it minimizes the risks of clogging.

Burn-off protection

Unlike the other conventional oils, the Castrol 03102 provides you high-quality burn-off protection.

Seal conditioners 

With efficient seal conditioners, the oil provides you higher protection against leaks and drainage.


  1. No leakage problems
  2. Minimizes deposit build-up
  3. Prevents wear and sludge
  4. Includes less phosphorus
  5. Amazing fuel economy


  1. Not ideal for winters


2. Lucas Oil 10115 Semi-Synthetic 2-Cycle Oil

Lucas Oil 10115 Semi-Synthetic 2-Cycle Oil.
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The Lucas Oil 10115 provides you the best experience with its premium additives and a highly-compatible design. Due to the semi-synthetic nature, you face minimum frictional wear. As a result, it elongates the life shell of your engine.

Next, unlike most other brands, this rx8 recommended oil serves you with superior fuel economy. And so, you can get rid of the hassles of replacing it. Furthermore, the lubricity ensures that you enjoy the smoothest rides every time.

Now, apart from that, this oil has an efficient cleaning mechanism. Because of it, you can keep your fuel injectors sludge-free and clean. Not to mention, it also helps with the performance of your engine.

Features & Benefits

Reduced friction

The frictional control of this semi-synthetic oil ensures you better protection against wear.

Smooth application

With this oil, you get excellent lubricity. As a result, your engine will perform super-smoothly.

Great fuel economy 

The oil provides you a higher fuel economy than other conventional motor oils. Therefore, it makes the oil even more convenient for you.


  1. Impressive cleaning
  2. Damage and wear control
  3. Minimizes leakage issues
  4. Prevent sludge and clogging


  1. A bit clumsy to pour


3. Idemitsu Synthetic Blend Rotary Racing Premix

Idemitsu Synthetic Blend Rotary Racing Premix
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This Idemitsu Synthetic Blend is the best motor oil for rotary engine for several reasons. Firstly, the lubricity of the oil allows you smoother performance. Moreover, it keeps your exhaust port and fuel injectors super-clean.

Secondly, the perfect blend of additives makes sure that you can keep the friction under control. Hence, you can protect your engine from all those frictional damages and boost its life span.

After that, the sealing mechanism facilitates a leak-proof application. That is why all these qualities enhance the user-friendliness of this oil.

Features & Benefits

Friction control 

The oil features superior control over friction to protect your engine from wear and damage.

Amazing cleaning

The additives of oil ensure efficient cleaning. Because of it, you can keep all the injectors and ports clean.

Improved sealing

With the high-quality sealing facilities, you can use it to protect your side seals and apex seals.


  1. Prevents premature damage
  2. Superb rotary fuel lube
  3. Ensures less clogging
  4. Excellent wear protection


  1. Limited to gasoline engines


Mazda RX8 Oil Cooler Line Replacement

1. Mishimoto MMSBH-RX8-04K Oil Line Kit

Mishimoto MMSBH-RX8-04K Oil Line Kit
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This Mishimoto oil line kit is the perfect companion for your rx8 for several reasons. For starters, it has the best quality materials that make it super-durable and efficient. Again, braided-lines use stainless steel.

Therefore, it makes it long-lasting and corrosion-free. Secondly, it takes care of the varying temperatures of your best motor oil for rx8. The dual oil-cooler makes it compatible with high-speed performances.

Finally, the impressive design allows it to handle up to 750 psi. Not to mention, you get M18 banjo bolts for more convenience.

Features and Benefits

Temperature control

The superb control over the temperature allows it to work from -40° F to +300° F without any problems.

Convenient fitment

The Mishimoto MMSBH-RX8-04K works perfectly for 2004-2008 rx8. Thus, it provides you much flexibility.


The quick identification makes it easy for you to install the oil line kit without any hassles.


  1. Great under pressure
  2. Free from corrosion
  3. Easy and long-lasting
  4. Includes oil seals


  1. Requires time to get used to


Best Oil Filter for Mazda RX8

1. Genuine Mazda B6Y1-14-302A Oil Filter

Genuine Mazda B6Y1-14-302A Oil Filter
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The best oil for Mazda rx8 needs the best oil filter. And so, this Genuine Mazda ensures all the goodness with its remarkable filtering-efficiency. Because of the 2-25 micron level, you get to enjoy super-fine filtering every time.

Not just that, the fiberglass and artificial fiber keep the structure intact and safe. As a result, the filter lasts long and enhances the efficiency of your engine.

Moreover, the filter meets OEM standards and provides superb compatibility. Thus, you get to enjoy maximum versatility. So, choose this filter for your rx8 and add a boost to its performance.

Features & Benefits

Great fitment

The Mazda B6Y1-14-302A filter fits your rx8 perfectly. Therefore, you can save up time by choosing it.

Best durability

With sturdy materials and design, the filter provides you impressive durability.

Superb efficiency

The filter provides you an efficiency of almost. As a result, you get a fine-filtration every time.


  1. Precise filtration
  2. Full-flow type
  3. OEM standard filter
  4. Long-lasting finishing


  1. Difficult pressure gauge handling


Things to Consider Before Buying the Best Motor Oil for Toyota Camry

There is no telling that all the products work outstandingly well. However, to get a perfect match for your rx8, you need to ensure several qualities. Therefore, in the next section, we will be talking about all those qualities.

Frictional control

That is probably the most crucial thing to notice before buying any motor oil. As you know, frictional contacts cause heat-production and wear. And so, if your lubricant fails to control that friction, your engine might face several problems.


Replacing your engine oil over and over again is quite a hassle. Now, the thing that can help you with that is the fuel economy. Not to mention, the oil that has a higher fuel economy can save you a lot of time and money. So, always check it before buying.


Clogging problems are not a new thing. However, if your engine oil includes high-quality detergency, things change a lot. That detergency maintains the cleanliness of the tubes and injections and prevents sludge-development. As a result, you ensure a longer life for your engine as well.

Protective measures

You see, issues like corrosion, rust, or wear can leave a disastrous impact on your engine. Hence, to protect your precious rx8 from such outcomes, you should always ensure maximum safety. That is why don’t forget to pick an oil that includes all these protective measures.


A lot of the conventional oils include too much phosphorus. As we know, these phosphorus works as catalyst poisons. Therefore, to minimize possible threats, you should pay attention to the materials. Moreover, prioritize environment-friendly products for better safety.

How to check oil Mazda rx8?

Maintaining the correct amount of oil is an essential factor for the performance of your RX8. Not just that, if you keep using your engine without fulfilling that criteria, you might end up hampering your engine. Therefore, check out the steps below to ensure a good check-up.

  1. To begin, warm up your engine so that it reaches the operating temperature.
  2. Next, switch it off and wait for a while for the oil to settle down.
  3. Now, start the process by removing the plastic covering from your engine. It stands right beside the bonnet.
  4. After that, find the dipstick at the right and remove it with the help of a cloth.
  5. Wipe the dipstick carefully and place it again.
  6. Again, remove it, and you will see the level of the oil in your engine.
  7. Fill it up with oil if it shows a level below- low.

Frequently Asked Questions (FAQs)

The above descriptions helped us gather a lot of information about these best products. Even so, you might have several questions on your mind. Therefore, to cover up most of those queries, we included the following FAQ section for you.

Q: Should I premix my rx8?

Answer: Well, you don’t need much premixing for that. For instance, you will need 2 ounces for every 10 gallons.

Q: What is the Mazda rx8 oil capacity?

Answer: Although the capacity of the Mazda rx8 is said to be 7.5 liters, you will probably get 4.5 liters in reality.

Q: What oil does a Mazda rx8 use?

Answer: Mazda rx8 uses synthetic oils in general. Moreover, use a minimum rating of 5w-30 SAE.

Q: What is the Mazda rx8 oil change frequency?

Answer: You should change your Mazda rx8 oil after every 12,000 miles. Eventually, it takes about a year.

Final Words

So, what are your thoughts about our top-picks? Of course, choosing the best oil for rx8 requires time and patience. Not to mention, focusing on all those parameters at the same time is quite challenging.

Nevertheless, try to get the most out of it by doing plenty of research. And so, go through the details one by one and compare them sequentially. With all the proper guidelines and reviews, we hope you will enjoy a fun and safe ride.

Happy Driving.

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