I recently changed the engine oil on my car (85000miles) and was surprised how black the new oil became straight away. Never had this on other cars before now and thought I should have used an engine flush in hindsight. Where garages have previously changed the oil I don't think any of them this as they never charged me for it. What are other peoples experience?
CX-5 Black Engine Oil
- Thread starter capsx002
- Start date
Thanks for the reply. Its diesel and I change every 12500 miles or 12 months.
Thanks for the reply. I'll give somethiing like that a go and probably do the next oil change earlier
N7turbo
2023 CX-5 2.5T ... 2024 MX-5 RF GT
12 months is fine but 12,500 miles is not. I hope you're way under that in 12 months. If you're really pushing that many miles, you'll need to change it every 6 months.
- :
- 2024 CX5 Akera G25
Normal for new oil in diesel engines to go black almost immediately. Its just how it is, not just Mazda, any of them. Nothing to be concerned about.
BUT:
It is VERY IMPORTANT TO RUN THE CORRECT SPEC OIL IN MAZDA DIESELS!!
Consult your owners handbook and make sure to use the correct spec oil. It must be a low SAPS oil. Usually in the Mazdas it is C1 spec (my CX5 I had for 8 years required C1 spec) or some require C3 spec.
Whatever your manual says, use that and NOTHING ELSE. Ignore those who say otherwise, they have no idea of Mazda diesel issues caused by incorrect spec oils. You will regret it if you dont use the spec as per the manual. And, if there is any warranty on your car, say goodbye if you dont.
Using the incorrect oil WILL destroy the dpf (thousands to replace one!) and cause sludging in the engine resulting in early engine failure.
I recommend that you change the oil at half the normal interval. Thats one of the secrets to keeping the Mazda diesels happy for the long term.
BUT:
It is VERY IMPORTANT TO RUN THE CORRECT SPEC OIL IN MAZDA DIESELS!!
Consult your owners handbook and make sure to use the correct spec oil. It must be a low SAPS oil. Usually in the Mazdas it is C1 spec (my CX5 I had for 8 years required C1 spec) or some require C3 spec.
Whatever your manual says, use that and NOTHING ELSE. Ignore those who say otherwise, they have no idea of Mazda diesel issues caused by incorrect spec oils. You will regret it if you dont use the spec as per the manual. And, if there is any warranty on your car, say goodbye if you dont.
Using the incorrect oil WILL destroy the dpf (thousands to replace one!) and cause sludging in the engine resulting in early engine failure.
I recommend that you change the oil at half the normal interval. Thats one of the secrets to keeping the Mazda diesels happy for the long term.
Last edited:
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
- :
- Southwest Ohio
+1 to what @Moonlighter ^^^ said. If you don't keep clean fuel and clean oil in your diesel engine, it's going to have problems.
All that black in your oil is carbon and soot. Also, I would suggest changing oil on a warm engine (if you're not already) and you want to let it drain (drip) for a long time.
I've done about 10 UOA on my diesel and have found 5,000 MI oil change interval doesn't provide much benefit over the (USA) recommended 7,500 interval. Here in the USA, I like Mobil1 ESP 0w30.
What country are you located @capsx002 ?
All that black in your oil is carbon and soot. Also, I would suggest changing oil on a warm engine (if you're not already) and you want to let it drain (drip) for a long time.
I've done about 10 UOA on my diesel and have found 5,000 MI oil change interval doesn't provide much benefit over the (USA) recommended 7,500 interval. Here in the USA, I like Mobil1 ESP 0w30.
What country are you located @capsx002 ?
Last edited:
It's some comfort to know that others also have experienced the same dis-colouring of the oil - i might reduce the milage to 10,000 and use a flushing oil next time round
Right.
Please stop.
Unless you show me specific examples of Mazda diesels failing from using diesel engine oil, i'm entirely unconvinced.
As mentioned, diesel engine oil gets dirty quickly, but 12000 miles is very late for a change. I would suggest doing another oil change, and try some sort of flush if you wish.
- :
- 2024 CX5 Akera G25
Youre the one who should stop giving bad advice to people that will cause their cars to have expensive problems.
You have zero experience with Mazda diesels and have no idea what you’re talking about. When you DO have some experience with them, come back and I will listen to what you have to say.
The issues with using incorrect SAPS rated oils in modern diesels with DPF’s is well documented everywhere, as are the examples of Mazda diesels being destroyed by the use of high SAPS (high ash content) oils. Even the oil manufacturers detail what happens when high SAPS oil is used in these engines.
Last edited:
N7turbo
2023 CX-5 2.5T ... 2024 MX-5 RF GT
Most people are going to recommend you reduce it to 7500 miles (12000 km), max. Better is 5000 miles (8000 km).
- :
- 2024 CX5 Akera G25
Here are some screenshots from the CX5 owners manual relevant to Euro spec Maxdas. And a link to the manual in case you dont have one.
Note that it specifies use of an oil meeting the C3 specifications.
C3 spec oils are LOW SAPS oils
C3 oils have a low sulfated ash (SA), phosphorus (P), and sulfur (S) content, or mid-SAPS level. This helps to reduce ash-forming content and protect exhaust aftertreatment systems.
You will see that I also included a photo from the manual about the damage that Mazda themselves say that using a non C3 spec oil can cause to a dpf (diesel particulate filter). If you google the cost to replace a dpf, hang on to your wallet, its not pretty.
I always changed my diesel CX5 oil there every 5000kms (halfway between the normal service). Its easy enough to do at home yourself, and IMO its good insurance. Other advice is to pick a good quality C3 rated oil and stick with the same brand all the time. My Mazda dealer has been OK with me supplying the oil for them to use when doing the services, this not only saves me money but it means the engine gets the exact same oil every change.
I also included a photo of the page from the manual detailing how to reset the oil data so the weench light goes away after an oil change,
Attachments
Last edited:
30 some years ago I had a 6.2 litre GM diesel. Drove it 500 km/day running freight.
I changed the oil every 2 weeks, 5,000 km and it was always black as Satan's heart.
I don't think I could live with the modern diesel engines with all the "extras" needed now for the emmisions. I'll stick to the gas engine as I'm not driving nearly the distance of 30 years ago.
I changed the oil every 2 weeks, 5,000 km and it was always black as Satan's heart.
I don't think I could live with the modern diesel engines with all the "extras" needed now for the emmisions. I'll stick to the gas engine as I'm not driving nearly the distance of 30 years ago.
