This lacks a bit of information - How is it that a 2021 has a complimentary 5k oil change ? Likely purchased in 2020 new- Did you just buy it used , and they threw in the " complimentary oil change " ?
Depending on the history of the vehicle , its always good to know which oil / viscosity etc was used during the prior ownership of the vehicle - If it was previously serviced at Mazda - Try to get the records from the service writer - Also check the owners manual and service log to see if the previous owners DIYd the oil service or used a drive thru company like Valvoline , OIl can Henrys etc - / Otherwise - use the OE specified oil viscosity recommended by Mazda - I personally adhere to this - Inexperienced service writers often try to play tech and say things which only confuse owners -- - yet - they are " franchises " and have latitude on service guide lines - Like using value line Mazda filters etc to perform oil changes and tune ups - I do my own oil changes at home - If its complimentary .....you get what they give you - In this case " complimentary :" sounds like a one time thing . Read you owners manual and default to OE spec oil if theres confusion. You likely have drivetrain warranty left on the vehicle and staying inside the recommended service guidlines during the warranty period can only help not hurt -- particularly if its used , and a turbo at the end of warranty duration . ----I dont have time to read every reply --so if this is redundant --so be it --best

 

lets start with if you can write this long a response maybe you should read all the responses before jumping into the pot!
Can you state a logical and empirical reason why you would need or could use the information of the viscosity oil?? Dude you never cease to be entertaining.
This one I screen shoot and place a copy in the shop as well sent to a few friends at various dealerships. They always get a kick out of forum and mostly what I show them are said on them. ROLO

Next what difference does it make if the basic recommended service was done by Mazda or an independent service shop? As long as you have service information from the shop doping the work?? Please ....dude you are cracking my up LOL
We do service work weekly having to do with anything except authorized WARRANTY service on new vehicle all still under the auto manufactures factory warranty. Not one time in over 20 years have we had any auto manufacture EVER dispute the service work we do under the basic service scheduling and VIN history applied information. I should ad specifically about MAZDA that I am the few authorized to even do MAZDA factory warranty service if I choose as long as it is not a SAFTY or RECALL and even then, there are exceptions. I get a pre approved contract directly from Mazda USA corp .e

Maybe rad completely and slowly this
Magnuson-Moss Warranty Act

BTW what in the world ever makes you think that in all the places on EARTH that all the recommend oil and viscosity is available to MAZDA owners. Get a life!!! LOL
The number one reason you see the recomended oil viscoity is DIY and I will even enclude service peapol have NO CLUE how to actaully determine the best oil viscosity to use in thier engine operating enviroment. So they made it easy for for those people that get confused just like recommending the coolant 50/50 mix instead of use a proper temperature table to adjust or mix coolant to water ration based again on the engines operating environment.
I personally run 70/30 most of the time and if it get over 105 plus days I go 80/20F coolant to water. Why... because water is a better coolant then antifreeze. LOL

 

I didn't mean to open a can of worms here. My beef is that, in my opinion, the dealer, whom we bought a service contract with, went with what's best for them, not what's best for our car.
Best for them, because conventional oil is cheaper than synthetic.
This is all just my opinion of course, your mileage may vary.
Anyways, I am satisfied now that the dealer actually used synthetic oil this time, at my insistence.
I wonder what my GMC dealer would think, if I insisted that he put in conventional oil in my '24 Canyon, instead of the go-to synthetic that they automatically use for my 2.7 Turbo?

 

 

Thats correct your opinion based on either bad information or not understanding the oils in general. Or what the difference in the words REQUIRED and SUGEESTED mean?


A dealer is not required to use a specific oil type unless it is REQUIRED by the auto manufacture, many dealers not just Mazda will often buy bulk oil from an oil distributor. It will if you ask to meet the specification from the auto manufacture. There is no Mazda that requires the use of Mazda specific oil. Mostly because even Mazda buys oil from several sources with their specifications. You can see and read this on the bottle which even the bottles are often different depending on a few factors location stock levels unused, updated new advertisement or style bottle etc. But those specification are met and or exceeded by many other bottled brands like Redline, AMSOIL, Mobil 1, Shell, Chevron and the list goes on!

You should feel fortunate that that dealer did the courtesy to use bottled for retail sales Mazda oil for your oil service as it was not in any terms or requirement under the basic or non-dealer extended Warranty service agreements

As for what your GMC dealer and exactly who you talked to would say about oil all goes to what they really know first about TURBO CHARGERS on a daily (not performance application) driver like your GMC and also not living in the past from the failed Turbos of decades ago when it was not the type of oil but rather the engineering in the Turbocharged engines that was the biggest factor in problems. Anyone that looks at the specification rating for such things as sheer temperature will see that even conventional oil if used in a daily driven Turbo charged engine as long as the proper viscosity choose and ALL oil and filter service are done at the proper miles or use which could be sooner than recommend will not harm or diminished the basic service life of a Dailey driven platform and model turbocharged engine.
If they claim anything but what I just wrote show them and see if they can come up with an answer other than their opinions or what they think you want to hear.. LOL

 

Good call - Ive use full synthetic as well - On one Mazda I have at 160K using 0w-20 and runs better than ever - no burning , no leaking - but with Turbos -- you have the engine oil cycling thru what I call the " oil boiler "- aka Turbo -- which uses engine oil for cooling - thus using a full syn that can handle the abuse is good -- I live in a cold environment and ow-20 gf-w/moly works great and has been used in my Mazdas including 1 that has over 160K and runs like new - When summer rolls around --I change it more frequently -

 

Sure if you lay on the throttle and boost like crazy on a summer's day pull up and shut the engine off the best designed engine with no Turbo- timer are going to cook the oil that remains in the oil feed line to the Turbocharger.
As for some recommendation to change the engine oil more frequently then non-Supercharged or Turbocharged engine has been shown via a few worldwide oil companies that do motor oil analysis that there is very few that suggest needing sooner replacement and most are generally higher milage motors that universally changing the oil more frequent has many benefits the least is the preservation of a Turbocharger cooking the engine oil! lol
Do you have any idea without looking at what temperature the brand and viscosity oil you use will flash ,burn and produce carbon? LOL

EVERY TURBOCHARGER I get needing rebuilt replaced that is burned down is directly from not service the engine or not recognizing when a TURBOCHARGER itself is going bad not associated with the oil>

So please tell me in your experience and DIY wisdom that you have at least rebuild a TOASTED TURBOCHARGER at least once?

One of several Turbocharges I have rebuilt for customers.
Also somewhere on this forum I have posted picture of my very modified Turbochargers.
I also build ported and polished with Big wheels Turbochargers for a few engine 1.8 and 2.0 . But no not for the baby Mazda Turbo. lol
While the complete unit has bulk the compressor and compressor and turbine wheel are tiny and the casting housing is very restrictive. No one wants to pay for a performance upgrade and then the need to have a ECU Performance calibration done after the better Trub unit install;. .

 

I forgot to add this to my last response. While you and a few other like to debate with me on subject not of equal or even same level expertise here is one member that does. I should point out the grime is a MAZDA trained certified Mazda Auto Technician. So may be you want to debate with both of us on this subject? lol

 

Callisto, so if you took your turbo Mazda in for an oil change, or do it yourself, would you specify that conventional oil be used, instead of synthetic?

 

LOL first I don't own a Turbocharged Mazda. And second it has been a few decades (4+) that anyone worked on my personal vehicles. The closet would be when I personally remove my tire/wheels and take them into Firestone to be mounted and I run Dino oil in most of my Motorcycles and the other depends on either semi or full whatever I happens to have in my garage?
I honestly cant see running conventional Motor oil because the price is the same for "ME" as fully synthetic oil. We buy in bulk from a distributor so when the shop buys I always purchase several cases of various oil brands and viscosities.
I am also personally a AMZOIL dealer use to be a distributor.

So your question as a fairly new member and not knowing me yet does not apply!
Here this will speed you up and maybe not ask questions like that directed at me.?
What do you do or have done for a living - Mazda Forum - Mazda Enthusiast Forums

You can also go to my profile under threads started and pick anyone?