Switched to 5W-30 from 0W-20

[Mazdiod2]

Sounds like a car from the '80s. I haven't seen any of that kind of stuff for years. As far as Castrol, it seems unlikely that Mazda would recommend it in the owner's manual if it was a problem.

 

[JDM_CX8]

I think the high moly gig is over rated...I'm betting they only specced the high moly as the 0-20 was so thin that it needed everything thrown in it to actually lube the motor....no such issues for the 5-30 so moly is not a required factor

 

[dunhillmc]

I think the high moly gig is over rated...I'm betting they only specced the high moly as the 0-20 was so thin that it needed everything thrown in it to actually lube the motor....no such issues for the 5-30 so moly is not a required factor

Toyota, Honda, and Subaru all use high moly oil for their 0w-20 factory fills. I think it's the same Idemitsu oil for all of them. The 0w-16 and 0w-8 Toyota now specs are also very high in moly

 

[N7turbo]

Yup. Toyota is using it on their low viscosity oils because they need it. The 5-30's don't need it.

 

[bojo]

Mine sounded like that when I used Pennzoil Platinum.
Engine got quieter when I switched to Mobile 1 EP. Waayyyy quieter.

On my first oil change I didnt use the recommended 0w20 for my skyactive , 2025 CX5, NON turbo either.. i used 5w30 and used Pennzoil Ultra Platinum. I expected the engine to be quieter, but i think its actually louder. Bearing in mind that skyactivs are known for their loudness, I was going to switch to mobil 1 like you.. but ive heard the opposite of what your saying. Multiple people say Mobil 1 is a good oil but definitely makes engines louder.

 

[bojo]

Wanted to also add to this thread, although its been up a while. That nobody here is mentioning the possibility (I say possibility because i dont know if its true) that mazda programs engines or oil pumps (Variable?) DIFFERENTLY when bound for the U.S., Candada, hence, ONE of the reasons for the recommended 0w-20..along WITH cafe requirements (even saw the Car care nut do a video on this regarding toyotas) curious what folks here think about that. I made a separate thread about this as well, just trying to get different opinions about it. Some say that the CX5 does NOT even have an electronically controlled variable oil pump so its a non issue, others are saying that could be true but its still only about the fuel economy and nothing to do with viscocity recommendations, so go ahead and use 5w30... I have a 2025 NA skyactive non turbo.. ..

 

[N7turbo]

I don't know how programming would affect anything. The computer controls ignition timing, variable valve timing, injector duty cycle, things like that. Think air, fuel, spark. Everything your oil interfaces with is mechanical in nature and set with physical tolerances. Think crank bearings, piston rings, timing chain, valve lifters.

 

[ADS-B]

Wanted to also add to this thread, although its been up a while. That nobody here is mentioning the possibility (I say possibility because i dont know if its true) that mazda programs engines or oil pumps (Variable?) DIFFERENTLY when bound for the U.S., Candada, hence, ONE of the reasons for the recommended 0w-20..along WITH cafe requirements (even saw the Car care nut do a video on this regarding toyotas) curious what folks here think about that. I made a separate thread about this as well, just trying to get different opinions about it. Some say that the CX5 does NOT even have an electronically controlled variable oil pump so its a non issue, others are saying that could be true but its still only about the fuel economy and nothing to do with viscocity recommendations, so go ahead and use 5w30... I have a 2025 NA skyactive non turbo.. ..

One word, acronym rather: C.A.F.E.

 

[kendel7]

On my first oil change I didnt use the recommended 0w20 for my skyactive , 2025 CX5, NON turbo either.. i used 5w30 and used Pennzoil Ultra Platinum. I expected the engine to be quieter, but i think its actually louder. Bearing in mind that skyactivs are known for their loudness, I was going to switch to mobil 1 like you.. but ive heard the opposite of what your saying. Multiple people say Mobil 1 is a good oil but definitely makes engines louder.

Was wondering.....Mazda recommends Castrol brand. Is the warranty voided if engine problems occur when using a brand other than Castrol?

 

[N7turbo]

Was wondering.....Mazda recommends Castrol brand. Is the warranty voided if engine problems occur when using a brand other than Castrol?

That was a long time ago. There is no specific brand recommended now. Just make sure it meets the latest specs (API SP, ILSAC GF-6, soon GF-7).

 

[madar]

I don't know how programming would affect anything. The computer controls ignition timing, variable valve timing, injector duty cycle, things like that. Think air, fuel, spark. Everything your oil interfaces with is mechanical in nature and set with physical tolerances. Think crank bearings, piston rings, timing chain, valve lifters.

Right, oil pumps are mechanical, at least for the 2016 year that I know of. Nothing programmed there.

 

[Lazy2.5]

Definitely. Mazda specifies a wide acceptable range for the Skyactiv engine in global specifications - up to 10W50 in some markets.

There's literally no need to waste your time worrying about the use of 5w30.

 

[dunhillmc]

Was wondering.....Mazda recommends Castrol brand. Is the warranty voided if engine problems occur when using a brand other than Castrol?

When OEMs mention another specific brand in the manual, that's just a marketing thing. Castrol paid Mazda for the placement

 

[cz5gt]

Right, oil pumps are mechanical, at least for the 2016 year that I know of. Nothing programmed there.

The CX-5 at least from 2017 has variable oil. There is also oil valve stuck at the block if I recall. Whether it can take any oil (beside 0w20 and 5w30) I don't know.