2017 Mazda CX-5 HPL No-VII 5w30 PCMO 10k

[spasm3]

2.5G non turbo 46000 miles on vehicle, 10k on oil.

Amsoil EA15K12 filter.

I have run 15k on this oil in my port injected Hyundai elantra and will go 20-25k this run.

But this Mazda is a fuel diluter and I was nervous to go more than 10k on a DI engine , known for fuel dilution, without a used oil analysis.

I am happy with this result. I did not change the oil, just sampled and replaced about 1/2 quart after sampling. No oil added during the 10k run.
I think the No-VII oil works very well in DI engines.

Any see any reason not to finish this oci at 15k?

Since the filter is small on this engine, should i be changing it a 7k for a 15K run, or just run that filter the full oci ?

@wwillson what do you think?

 

[wwillson]

The wear metals look great. Did you do a oxidation baseline on this oil? I would assume the new oil would have an oxidation around 20-25, if that's the case this oil is in good shape. TBN is 5.6, which is still good for more miles. HPL has a great reputation to be able to handle fuel dilution well.

If you cut the element out of the filter, it will give you a better idea if the filter needs to be changed. No debris, run the next filter longer, if there is hard carbon in the filter, change the next one at the same interval.

Remember, I am the world's foremost expert on my opinion. Take it for what it's worth.

 

[fantastic]

Send it... The HPL has a strong base oil & with the viscosity looking normal. Yes, the fuel is flagged but it's not terrible. I'd certainly resample at the end of the 15k run to see what the fuel dilution is for a better idea of extended drain interval. I've seen where fuel dilution sort of plateau's.

 

[spasm3]

Send it... The HPL has a strong base oil & with the viscosity looking normal. Yes, the fuel is flagged but it's not terrible. I'd certainly resample at the end of the 15k run to see what the fuel dilution is. I've seen where fuel dilution sort of plateau's.

Thanks , this engine is a diluter, always has been. This sample was taken after a 30 minute drive. I was not surprised, as it has been worse on other samples. Terrible if short tripped.

 

[spasm3]

The wear metals look great. Did you do a oxidation baseline on this oil? I would assume the new oil would have an oxidation around 20-25, if that's the case this oil is in good shape. TBN is 5.6, which is still good for more miles. HPL has a great reputation to be able to handle fuel dilution well.

If you cut the element out of the filter, it will give you a better idea if the filter needs to be changed. No debris, run the next filter longer, if there is hard carbon in the filter, change the next one at the same interval.

Remember, I am the world's foremost expert on my opinion. Take it for what it's worth.

Thanks. I think i will leave the filter till 15k then cut it and decide. I included you, since you have a lot of extended oci runs. I know how good High Performance Lubricants oils are, but i am surprised how good this uoa was for a DI fuel diluting engine. This engine dilutes a lot regularly and the constant dilution and vaporizing off and re-diluting, i expected the TBN to be lower. I had a few tanks of E-15 in it also.

 

[fantastic]

Thanks , this engine is a diluter, always has been. This sample was taken after a 30 minute drive. I was not surprised, as it has been worse on other samples. Terrible if short tripped.

Understand that & like you stated DI is great for power but at the cost of potentially higher fuel dilution is what we've learned. Just doing some quick math if everything kept pace would equal 4.2% fuel dilution but that may or may not happen. You're already using a 30 grade which buys you some miles vs the OEM 20 grade. Just resample again at 15k as I'm sure you will figure out what may be a good interval for this CUV. You did mention short tripped as you found out wasn't helpful in this regard so perhaps reducing the mileage may be necessary on that usage type. You already knew all of that stuff though.

 

[fantastic]

Thanks. I think i will leave the filter till 15k then cut it and decide. I included you, since you have a lot of extended oci runs. I know how good High Performance Lubricants oils are, but i am surprised how good this uoa was for a DI fuel diluting engine. This engine dilutes a lot regularly and the constant dilution and vaporizing off and re-diluting, i expected the TBN to be lower. I had a few tanks of E-15 in it also.

If you can i'd stick with 10% ethanol since higher ratios can cause more dilution. Maybe a few tanks won't hurt?

 

[spasm3]

If you can i'd stick with 10% ethanol since higher ratios can cause more dilution. Maybe a few tanks won't hurt?

I didn't run it regularly, but this engine has been a diluter from day one. I'm curious if the newer mazda cx-5 engines dilute like mine.

 

[spasm3]

You did mention short tripped as you found out wasn't helpful in this regard so perhaps reducing the mileage may be necessary on that usage type. You already knew all of that stuff though.

When we first got it, her work drive was 4 miles each way. Fuel dilution was 5% or more especially during winter. Even longer drives on the weekend were not enough to vaporize it all off. I ran Mobil 1 0w-40 during winter, just to have enough viscosity, and changed every 2k miles.

She does not short trip anymore, works from home. It gets driven much longer now. but still it dilutes.

 

[D1dad]

Does a long hard drive actually clean up the fuel or is the damage done to the oil? I had a brief 30 second misfire on brand new XPR and don’t wanna dump high $ oil over it.

 

[fantastic]

Does a long hard drive actually clean up the fuel or is the damage done to the oil? I had a brief 30 second misfire on brand new XPR and don’t wanna dump high $ oil over it.

No not really. Once it's in there hard to get out.

 

[D1dad]

No not really. Once it's in there hard to get out.

So is a 30 second misfire on a non GDI a concern?

 

[fantastic]

So is a 30 second misfire on a non GDI a concern?

Misfiring isn't good so keep an eye on that. The oil is probably fine though. Any codes you've checked?

 

[D1dad]

Misfiring isn't good so keep an eye on that. The oil is probably fine though. Any codes you've checked?

It was my own fault. I replaced coil packs and plugs and one of the harnesses wasn’t officially snapped. It clicked, but didn’t fully seat. The car ran for maybe a total of a minute on two separate starts before I found it. The oil had less than 1k on it and isn’t exactly cheap, so I don’t wanna dump it if I don’t have to.

 

[buster]

Oil is in great shape. 15k is easily doable here IMO.

 

[spasm3]

Oil is in great shape. 15k is easily doable here IMO.

I probably won't do another uoa, but will run it the rest of the way out to 15k and change.

 

[Mulligan]

I'm curious if the newer mazda cx-5 engines dilute like mine.

The one and only UOA I did for my 2018 CX-5 at 2350 miles on the oil and 15,000 on the engine showed a flashpoint of 415°F, which Blackstone translated to <0.5% fuel. So, not all Mazda Skyactiv 2.5 NA engines dilute. I almost never made trips of less than 20 miles, which might have helped.

I now have a 2025 CX-5, but it will be quite a while before I do a UOA for it. So far, I don't detect the scent of gasoline when I sniff the dipstick, for whatever that's worth.