Oil change drama

To be fair, the owner's manuals don't specify synthetic oil. They don't even recommend it. All that's necessary for the warranty to be honoured is that the specs of the oil used match with what is specified in the manual. The OCIs identified in the Maintenance Schedule are based on the recommended oil specs, after all.

All that said, synthetic oil is a much better option for a turbocharged engine, and the added cost of synthetic is well worth the long term benefits the engine gets from it. If you have access to and can afford synthetic, you should use it.
Here is the excerpt from the manual:
▼ Recommended Oil U.S.A., Canada SKYACTIV-G 2.0, SKYACTIV-G 2.5 Use SAE 0W-20 engine oil. Mazda Genuine Oil is used in your Mazda vehicle. Mazda Genuine 0W-20 Oil is required to achieve optimum fuel economy

SKYACTIV-G 2.5T Use SAE 5W-30 engine oil. Mazda Genuine Oil is used in your Mazda vehicle. Mazda Genuine 5W-30 Oil is required to achieve optimum fuel economy

Outside US, Canada the recommendation in the manual is to use SAW 5W-30. That's all it says.
 

Chris_Top_Her

Banned
Moderator
Contributor
L
San Antonio, Texas
V
'15 CX-5 Miata AWD
I doubt Honda specs an o-ring that can't stand the heat. I have used and re-used them and they don't crack or leak.

The package had 5 of them for $3-4 or so.

I like Mazda but sometimes I wonder.
Why spec a conventional oil for a turbo?
Why not specify regular brake fluid change?
Mazda didnt spec a conv oil. 5w30 can be had in synthetic.. I use it. In fact a 5qt jug of the shell 5w30 full syn I use costs ~$23usd. Walmart brand (which is dexos licensed) is like 15. Also 5w30 is in the name owners manual as well. 0w20 is only reccomended for the marginal fuel economy increase which lowers mazda fleet mpg in test stands. Some cars say 0w16 (and 0w20 as a sub), and soon there will be 0w8 for mpg gains measured in the 2% on a test engine
The super premium seems to be the conventional nd.the ultra apparently is the full synthetic.
 

Attachments

Last edited:

Chris_Top_Her

Banned
Moderator
Contributor
L
San Antonio, Texas
V
'15 CX-5 Miata AWD
Honestly with the price of 5qt of full synthetic oil as low at $15, there is no reason to be running dino oil in a modern engine. Especially a GDI or turbod one (asking for coking). you can change your own oil for $20-25 in parts, the difference in price at a lube shop/dealer is literally a sucker upcharge. The price diffference in dino/synthetic oil at walmart is like $3 for 5 qts. You can always ask for a labour only price and supply your own oil if it come out cheaper
 
V
2014 Mazda3 S GT auto, 2008 MX5 6-speed
If it is dino oil change it at 3K miles or 3 months, which ever comes first.
Consumer Reports did an extensive test of taxi cab engines and the effects of oil change intervals, many years ago. They found that:
a) No engine oil needed to be changed at 3000 miles.
b) The non-synthetic oil in the taxis lasted about 7500 miles before losing the protective compounds.

I use full synthetic oil and change it every 12 months (5000 to 7500 miles). For those with older vehicles (no direct injection), add some Chevron Techron injector cleaner to your full gas tank at every oil change.
 
V
2019 Mazda CX-5 Signature
What's the difference btwn drum and bulk? Maybe bulk is like a case of single qts/lts?
Anyway, no moly version of 5W30. I'll stick with LiquiMoly.
 
V
CX-5 Sport 16.5 6M
I bet some dealers only have one kind of oil in the drum.

I know the Mazda brand oil has moly which is good, but I have also read that titanium is really good and Castrol has titanium.

They say synthetic is really good in low temperatures plus less boils off in the heat.
 
V
2014 Mazda3 S GT auto, 2008 MX5 6-speed
MAZDA states 5,000 for severe service and lists what they consider severe. Ed
I would think that Mazda's algorithm that determines oil change intervals determines whether your driving is in the severe category in some ways but would not know if you're driving in dusty environments, for example. Perhaps oil pressure on the upstream side of the filter would indicate a faster particulate entrapment rate and result in shorter oil change intervals?
 
V
92 MX-3; 18 CX-5
I guess I'm a sucker for the algorithm and for the reason that I believe that even standard oil is good for 5K.
Do you think driving in a dusty environment has any impact on oil life? My thought: You just may need to change the air filter more often.
 

Chris_Top_Her

Banned
Moderator
Contributor
L
San Antonio, Texas
V
'15 CX-5 Miata AWD
What's the difference btwn drum and bulk? Maybe bulk is like a case of single qts/lts?
Anyway, no moly version of 5W30. I'll stick with LiquiMoly.
Doesn't mean it doesnt have moly. You'd have to perform or find a VOA. Rotella has moly in it and it's not listed anywhere on the carton. Liqui moly says "moly" and doesn't even have moly in all of it's oils (mis leading). Look up liqui moly VOAs some of them have impurities which means lower quality base oil. They (LM) actually sell a moly additive that you add to oil. Also it basically lost to amazon basic oil in a test lol.
 

Attachments

Chris_Top_Her

Banned
Moderator
Contributor
L
San Antonio, Texas
V
'15 CX-5 Miata AWD
I bet some dealers only have one kind of oil in the drum.

I know the Mazda brand oil has moly which is good, but I have also read that titanium is really good and Castrol has titanium.

They say synthetic is really good in low temperatures plus less boils off in the heat.
Castrol titanium has moly and titanium (although not a lot but more than most since many oils dont use it). I used it before switching to shell. I wanted shel for the emphasis on engineering for stressed engines
 
V
2014 Mazda3 S GT auto, 2008 MX5 6-speed
I guess I'm a sucker for the algorithm and for the reason that I believe that even standard oil is good for 5K.
Do you think driving in a dusty environment has any impact on oil life? My thought: You just may need to change the air filter more often.
It is possible for air to get around the filter at times. In that case your engine could be pulling in dirty air while you are oblivious to it happening.
 

Latest posts

Top