maybe go back to the beginning of this thread and re-read it? So many are brain-washed to believe they "must" use only full synthetic oils? It is more about making sure that the basic scheduled service is logged into your VIN to support any issue that may be needed to have covered under the warranty.

This is a great thought that other owners should emulate regarding the servicing of your vehicles to the service shop/department. Ask questions if you don't know and don't just assume!
Based on current economy it would not surprise me to learn many more dealerships will start using a bulk quantity synthetic blend? And many already do!

 

None of my road vehicles have ever specified what motor oil only viscosity and SAE certified.
For the past 20 years I've used fully synthetic oil in all my road vehicles and my motorcycles.
The facts are that it has been proven in multiple controlled tests to last longer than semi-synthetic, blended and conventional.
That said, you need to follow the proper maintenance schedule for all of them.

 

I took our CX-5 Turbo in for it's semi-annual service (agreement). I told the dealer this time that I wanted full synthetic. I printed out a letter from Mazda Customer Experience, where they admitted full synth is better for turbos.
The service writer didn't argue this time, and it was done as I requested. It's a '22 with 27K miles on it. It's been a rock solid car so far.

 

I would like to read that complete letter. Can you please provide it?

 

if not clear, it says "Typically, fully synthetic oil is suggested because it offers better protection under high temperatures and heavy loads, which is ideal for turbocharged engines."

 

That is one of the most vague letters I have read. While it "suggests" full synth is better, it defers to the dealer to decide. They certainly could have told you they used conventional oil only and you really would have had no options at that point other than t do it elsewhere or yourself. Luckily they did it for you.

 

Read again , it does not suggest to use but it is suggested that ?
It’s clear that most just don’t get all the empirical information about oil in general.

In a perfect operating environment and ideal driving condition as well a trained driver ,and full monitoring of engine operation there are slight benefits to use fully synthetic oil.

But in the real world all 3 will work almost equally……. In the real world !

The service employees are not performance engineers nor are they engine builders they are about the same when it comes to to personal beliefs about good better and best oil to use.
This debate has been going on since the 80’s when fully synthetic oil was starting to gain marketing sales.

Having personally seen engine using only one of the three oil types none supported any documentation indicating greater performance over the other for a daily driver .

I personally use both even in performance engines that cost 10-15 k for me to build . And have had oil analysis done useing both and the reports never indicated fully synthetic better then semi or none synthetic or what we now call conventional oil .

I should point out that the Mazda service guides as well Owners service information only state recommended oil type and NOT required.
The use of any of the 3 types of oil will not void the WARRANTY nor has there ever been a warranty denial for using the choice of the conventional, semi-synthetic, or fully synthetic oil as long as the the proper oil viscosity for the engines operating environment was used.

Now if we look empirical facts about testing the 3 in a controlled environment the fully synthetic will come out with the best overall results filled be semi and last most all but not every one 3rd . I did say not all non synthetic motors oil come in last.

As for a Supercharged or Turbocharged engine , that hyp was brought about during the early large production levels of boosted engines most were from less thought out engining of the oil supply and temperature control of the Turbo or Superchargers that cooked the oil.However most platforms now have advanced from those early days and yet the general consensus from most is if boosted always use fully synthetic oil.

And once again the facts and data collected were performed in a controlled engine operating environment.

So before you all start posting https to debate or dispute my response please at least check your info, who published it and if the institutions that did the testing give the perimeters of how they tested to get their conclusions and findings. And good luck with that.

 

^^^^^^^^^^^^^^^

Well this reads like something our governor here in the dictator run state of Kalifornia .. lol

 

Not getting your post. You are saying the letter does NOT suggest synthetic be used? Let write it out again so it's as clear as it can be:

"Typically, fully synthetic oil is suggested because it offers better protection under high temperatures and heavy loads, which is ideal for turbocharged engines."

But, they used the words "typically" and "suggested" which gives wiggle room if the dealer doesn't want to abide by the suggestion.

Your info about synthetic vs conventional is up for debate and if there really was no difference, why would manufacturers tell one to use synthetic oil in any case? I know my 2002 Boxster had a Mobile One sticker from the factory and my 2006 M Roadster is speced to use only 10W60 oil which is only made as full synthetic - I have looked, there is no conventional 10w60 on the market.

 

Its not an obeyed by it merely how someone that is NOT in any fashion an expert responded to a question over "HIS/HER PAID GRADE" so to say. lol!
A sticker from the factory... auh you do realize how those and other oil recomedatio0ns are posted from auto manufactures? hehehe!

Again I will sate with pure fact unless an auto manufacture uses the exact word REQUIRED then there is no such thing as anything but to use any oil that meets the minimum or exceed the oem specifications ! non and semi both offered by many oil distributors do!

Dude you are better at finding information on the internet than me go look for empirically and fact based via confirming where and who wrote the technical article or report and find what I am saying.

Hey I get it.... peace of mind and sticking with some beliefs works! I am the same way on many things auto related I just don't really post what they are. rolmao.