That's crazy ,and will have a very negative effect on engine longevity .

 

No it will not! Unless maybe you are going to see if the engine last over 500k miles? lol
You of all people (cuz you are an old fart) know that engines were tested on Dino motor oil in the late 70's and 80s that last over 200+ miles with no engine negative effect. And that was on engine technology back then.

 

Synthetic oils have become very good now a days ,but I just wouldn't trust the oil or filter to lubricate properly at over 10000 miles . I sure wouldn't want to by a used Mazda that had only had the oil and filter changed at 15000 miles . But WTF do I know , I'm no petro chemical engineer . And as far as the oil filter goes , I'm very doubtful about its integrity of it at 15000 miles. Modern aluminum block and head direct injection engines with higher engine temps, higher compression stricter emissions and more exhaust gas recirculation are going to be harder on engine oil than 70's vehicles . Anyway IMHO an ounce of prevention is worth a pound of cure ,and your chances of your engine lasting longer is more than likely greater with shorter oil and filter services .

 

I agree about changing the oil at sooner intervals. The problem isn't the oil...i believe the oil will last just like they say it will. The problem is all the small particles, dirt and metal floating around ... Sticking a few more magnets on the oil pan might catch the metallic stuff but it's still not gonna catch everything, and non metallic particles. I try to change mine at 6000 when have the time.

 

And there you have it, it's not the oil that is the problem it's the contaminants.
A better scenario for modern engines would be having the oil filter changed more frequently than the oil.

 

Yea there is that too, when the filter clogs/gets restricted it has a bypass vave and it no longer filters the oil. But I still do not believe oil with 15000 miles can lubricate as well as oil with only 5000 mile on it. From what I understand the dealer uses and will continue to use Mazda's high moly oil and according to some unsubstantiated claims is just extending the service intervals. At any rate I would never subject any of my vehicles to 15000 mile oil and filter changes . If maybe I'm wasting money by changing my oil and filter at 5000 miles , it is something I'm willing to live with for nothing more than just peace of mind .

 

Please note that the Grim Reaper said 15,000 km, not miles. That works out to just over 9,000 miles.

 

Oh ,now this become more logical . I have never been a fan of the metric system ,and in so far as I live in America where its MPH, Gallons, Quarts, Pounds ,and ounces I always think of it that way. I should have read the post more carefully . This just further supports my take on oil and filter service intervals. I am Just curious if Schmieg is aware of this ....? https://www.urbandictionary.com/define.php?term=Schmieg
Funny story ,I went to Niagara Falls in 1973 on my honeymoon in my 1970 440 6 pack Cuda with my first wife and got a ticket for speeding at 177 kph because the speed limit sign said 100kph and thought it was 100 mph not 100kph . I figured only 10 over was no big deal .

 

And my daughter is named Karen - twice cursed by slang.

Ancestry states that the name is a derivative of schmiege which means a bend or turn in a river. However, the German dictionary I used when I took German in college said that schmieg meant a flexible ruler (the measuring type).

Personally, I really don't care.

 

I always love forum members and all their arm chair run to the internet for information logic of what they think happens in the real world..... ROMAO...

Honestly guys oil analysis does not lie and most of what I read here is not in any way indicative to Dailey drivn gasoline engine at least up to about 100K miles with following the bare minimum servicing.

You know you are all so stuck on what MAZDA says , maybe you should look into how many times MAZDA and most all auto manufactures have revised the WORD (LOL) technical information about servicing and what to use in the the last say 75 years!!!


Hey but keep up the great responses they are best entertaining (me) at best!

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