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Anyone have any thoughts on regular vs premium?
I'm currently running premium "brand name gas". Sunoco.
Also any thoughts on the maintenance of direct injection engine?
It’s really tough to say the impact or performance difference between regular and premium gas without datalogging the car. I would suggest using a top tier gas like you are doing and change your oil frequently with a high quality oil. Also, don’t let your car idle for long. Not a good thing for direct injection cars.
 

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Id personally always recommend premium in a car with a turbo unless it recommends 87. The Subaru 2.4 for example has no benefit using 91 over the 87 recommended. And actually runs better on 87 which is amazing. Ive had 2 STI's in the past and even on 91 they had issues because they recommended 93, in Ca we only get 91.
Ive noticed after the 1000 mile mark and only using shell 91 it seems to have opened up a bit more in a good way. And speaking of shell 91, my two local dealers ( san Diego)dont have the 10% ethanol in fuel lables anymore. And one of those two have 0% ethanol listed.
 

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Id personally always recommend premium in a car with a turbo unless it recommends 87. The Subaru 2.4 for example has no benefit using 91 over the 87 recommended. And actually runs better on 87 which is amazing. Ive had 2 STI's in the past and even on 91 they had issues because they recommended 93, in Ca we only get 91.
Ive noticed after the 1000 mile mark and only using shell 91 it seems to have opened up a bit more in a good way. And speaking of shell 91, my two local dealers ( san Diego)dont have the 10% ethanol in fuel lables anymore. And one of those two have 0% ethanol listed.
Curious, what issues did you have with your STIs?
 

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I did some testing using exclusive Exxon gas. 93 Vs 87 and I have to say I can't tell the difference but I drive car very gently. I did some research and some say that car needs to be pushed to around 5000RPM to get a feel in HP difference. My car never seen 3500RPM so I put premium every other tank just to feel better I guess.

On another note (Can Anybody confirm it please) - CX50 Turbo is air cooled only???? Most turbos these days are both liquid and air cooled but I found info that 2021/2022 Mazda CX5 turbos are exclusively air cooled!!!!
If that's the case, we better keep these things running for a minute or two before turning the engines off.....
 

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It’s really tough to say the impact or performance difference between regular and premium gas without datalogging the car. I would suggest using a top tier gas like you are doing and change your oil frequently with a high quality oil. Also, don’t let your car idle for long. Not a good thing for direct injection cars.
Well said - stick to top tier gas (I personally use Exxon Mobile) and you should be fine. I would not put gas from 711/Wawa/costco/weis etc... but it Is personal preference rather than scientifically proven fact.
 

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Well said - stick to top tier gas (I personally use Exxon Mobile) and you should be fine. I would not put gas from 711/Wawa/costco/weis etc... but it Is personal preference rather than scientifically proven fact.
I have tuned and datalogged many cars. The most consistent gas I have seen is Costco. The most inconsistent…Shell.
 

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I did some testing using exclusive Exxon gas. 93 Vs 87 and I have to say I can't tell the difference but I drive car very gently. I did some research and some say that car needs to be pushed to around 5000RPM to get a feel in HP difference. My car never seen 3500RPM so I put premium every other tank just to feel better I guess.

On another note (Can Anybody confirm it please) - CX50 Turbo is air cooled only???? Most turbos these days are both liquid and air cooled but I found info that 2021/2022 Mazda CX5 turbos are exclusively air cooled!!!!
If that's the case, we better keep these things running for a minute or two before turning the engines off.....
The CX50 does have an intercooler if that is what you mean. I believe the turbo also has coolant lines running to it. I am not sure if it continues to run coolant through the housing once the car is turned off. You don’t need to run it for long when you come to the end of your drive. 30 seconds after a hard run is long enough.
 

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The CX50 does have an intercooler if that is what you mean. I believe the turbo also has coolant lines running to it. I am not sure if it continues to run coolant through the housing once the car is turned off. You don’t need to run it for long when you come to the end of your drive. 30 seconds after a hard run is long enough.
The guy reviews the CX5 and mentioned that Turbo is air cooled only. He usually knows what he is talking about so I took his comment seriously. Perhaps that changed with CX50 - this, I do not know....hopefully it did.
https://www.youtube.com/watch?v=TFIxjBDlVkc
 

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The guy reviews the CX5 and mentioned that Turbo is air cooled only. He usually knows what he is talking about so I took his comment seriously. Perhaps that changed with CX50 - this, I do not know....hopefully it did.
After going to my garage and taking a quick five second peek, our turbos do have coolant lines running to them. Unless you are running your cx50 extremely hard and then shut it off, I don’t see a reason to keeping you car idling for any amount of duration. The way that our cars are geared, you would either have to be on a track or driving like a lunatic on the street to worry about oil getting coked up in the turbo.
 

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That is Interesting - how do you do data logs and how do you conclude gas consistency based on that?
Depending on the make and model, I have used HP Tuners, Cobb AP, EcuTek, MazdaEdit to name a few. To keep it simple, I would either have a device (like the Cobb) or my laptop connected to my vehicle through the OBD2 port. As I am driving, I am recording many parameters of the vehicle and what the motor/ecu is doing. I can determine through knock and timing if I have decent gas. Unless it’s a Ford and their sensors are touchy and pick up false knock. Grrr… Such a pain to deal with.
 

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Depending on the make and model, I have used HP Tuners, Cobb AP, EcuTek, MazdaEdit to name a few. To keep it simple, I would either have a device (like the Cobb) or my laptop connected to my vehicle through the OBD2 port. As I am driving, I am recording many parameters of the vehicle and what the motor/ecu is doing. I can determine through knock and timing if I have decent gas. Unless it’s a Ford and their sensors are touchy and pick up false knock. Grrr… Such a pain to deal with.
Thanks for explanation. I have an account with Exxon and they usually offer me 20 - 40c off on gallon so I stick with Mobile gas for all my cars.
Since we are on a subject - any clue why Mazda recommends 5W30 as their viscosity of choice, while my '21 Lexus NX (same engine configuration) takes 0W20? When comparing both cars, Mazda runs MUCH hotter than Lexus.

Is it possible that the turbo in CX50 is configured to kick in at lower RPMs than in Lexus? That would translate into more frequent turbo usage in Mazda since both cars are driven very gentle in the city 99% of the time.
 

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After going to my garage and taking a quick five second peek, our turbos do have coolant lines running to them. Unless you are running your cx50 extremely hard and then shut it off, I don’t see a reason to keeping you car idling for any amount of duration. The way that our cars are geared, you would either have to be on a track or driving like a lunatic on the street to worry about oil getting coked up in the turbo.
Super interesting - so perhaps the drivetrain configuration is slightly different from CX5.......Once you get/confirm all your findings in the future - keep me posted!
 

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Thanks for explanation. I have an account with Exxon and they usually offer me 20 - 40c off on gallon so I stick with Mobile gas for all my cars.
Since we are on a subject - any clue why Mazda recommends 5W30 as their viscosity of choice, while my '21 Lexus NX (same engine configuration) takes 0W20? When comparing both cars, Mazda runs MUCH hotter than Lexus.

Is it possible that the turbo in CX50 is configured to kick in at lower RPMs than in Lexus? That would translate into more frequent turbo usage in Mazda since both cars are driven very gentle in the city 99% of the time.
Asking the age old question about oil viscosity will get you many different answers and opinions from others. Thinner oils are a result of tighter tolerances in the motor along with overall gas mileage efficiency. I was a skeptic early on of the thinner oil offerings, but research has shown that a high quality oil at 0w-20 provides good protection for fairly reasonable extended change intervals. Honda is working on 0w-8! I would imagine Mazda has selected 5w-30 to help combat LSPI due to the small turbo providing high boost at low RPMs. Also, Mazda only provides a few engine options and their overall gas mileage average as a manufacture is better than Lexus who, when measure by their whole fleet that offers V8s has a lower gas mileage average.
But to answer your question about heat, it is hard to say what temperatures both motors are running at when they are at their operating temperature. I can’t speak for the Lexus, but our CX50’s do not have an oil temperature gauge. If you are talking about measuring by just feel, that is hard to say as well. For sure, Lexus offers more NVH material to cut down on heat escaping the engine bay. Which could be a good or bad thing, depending on how you look at it.
 

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Asking the age old question about oil viscosity will get you many different answers and opinions from others. Thinner oils are a result of tighter tolerances in the motor along with overall gas mileage efficiency. I was a skeptic early on of the thinner oil offerings, but research has shown that a high quality oil at 0w-20 provides good protection for fairly reasonable extended change intervals. Honda is working on 0w-8! I would imagine Mazda has selected 5w-30 to help combat LSPI due to the small turbo providing high boost at low RPMs. Also, Mazda only provides a few engine options and their overall gas mileage average as a manufacture is better than Lexus who, when measure by their whole fleet that offers V8s has a lower gas mileage average.
But to answer your question about heat, it is hard to say what temperatures both motors are running at when they are at their operating temperature. I can’t speak for the Lexus, but our CX50’s do not have an oil temperature gauge. If you are talking about measuring by just feel, that is hard to say as well. For sure, Lexus offers more NVH material to cut down on heat escaping the engine bay. Which could be a good or bad thing, depending on how you look at it.
Thank you - good discussion and great experience!
I drive from/to work, 6-8 miles in the city at average 25 MPH. When I park car in the garage, open its hook, there is a heat wave coming from engine bay in CX50. All engine covers are too hot to touch. All painted, outer panels are very hot to touch.
Same example with NX - materials are barely warm to touch, outer panels are not warm at all. I did not compare actual temperature readings but that is coming :)
I got professional and recently calibrated Fluke temp gun that I mean to use it for my little experiment.
 

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Thank you - good discussion and great experience!
I drive from/to work, 6-8 miles in the city at average 25 MPH. When I park car in the garage, open its hook, there is a heat wave coming from engine bay in CX50. All engine covers are too hot to touch. All painted, outer panels are very hot to touch.
Same example with NX - materials are barely warm to touch, outer panels are not warm at all. I did not compare actual temperature readings but that is coming :)
I got professional and recently calibrated Fluke temp gun that I mean to use it for my little experiment.
I imagine both motors run near the same internal temperatures as one another. Lexus just does a great job of putting NVH materials around their engine bays and chassis to help with noise and vibration. This also helps with masking heat. I bet if you climbed under both cars and took your temp gun and measured the heat coming off both oil pans, they would be nearly identical.
 

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I did some testing using exclusive Exxon gas. 93 Vs 87 and I have to say I can't tell the difference but I drive car very gently. I did some research and some say that car needs to be pushed to around 5000RPM to get a feel in HP difference. My car never seen 3500RPM so I put premium every other tank just to feel better I guess.

On another note (Can Anybody confirm it please) - CX50 Turbo is air cooled only???? Most turbos these days are both liquid and air cooled but I found info that 2021/2022 Mazda CX5 turbos are exclusively air cooled!!!!
If that's the case, we better keep these things running for a minute or two before turning the engines off.....
All Mazda Skyactiv Turbo's are oil fed/lubricated.
 

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I have driven with both. Premium is better in terms of how smooth the motor feels and in traffic, there are much fewer jumps. But Mazda talks about the specs and stats for both type of gas so you are safe doing either way.
 

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The key to the fuel is using a top tier fuel. Google it. That doesn't mean top tier OCTANE. Fuels that are certified TOP TIER have detergents in them that keep the engine clean and free from carbon build up, which direct injection engines are prone to.

Your best defense, to the above, is top tier fuel and regular synthetic oil changes...
 
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