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I've had dealer (free) oil changes since new. I asked the mechanic what they use. 5-20 synthetic blend. 40,000 + miles and counting.......
That backs up some of the arguments in here that the service department is using the bulk oil versus what the manual recommends. The semi-synthetic is their bulk stock. May not be much of an issue between semi-synth and full on synth, but then again what's the difference between a Chevrolet and a Cadillac?
 

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Does anyone know who manufactures the Mazda moly oil? I'm guessing Mazda Corp isn't in the refining business. Can the same moly oil be bought under a different brand name than Mazda?
 

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This may be of interest ...im not a oil expert by any means but I do recall reading that the wider the viscosity range, the less quality the oil. Something about the extra additives required to widen the range, so if faced with a choice, i tend to stick with the closer range. In this case 0-20 having a range of 20 and 5-30 having a range of 25.
 

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Does anyone know who manufactures the Mazda moly oil? I'm guessing Mazda Corp isn't in the refining business. Can the same moly oil be bought under a different brand name than Mazda?
Mazda recommends Castrol in their owner's manual. This is just an guess, but I would suspect that they might use Castrol Edge 0W20 as the base then add their moly additives to it.
 

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I'm sooooo ashamed of myself that I totally missed this post. I must be slipping. As a self-proclaimed and self-appointed "Royal Purple" evangelist, I HIGHLY recommend Royal Purple 0w-20 (http://www.amazon.com/gp/product/B005SEK9IQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00) and Filter (Amazon.com: Royal Purple 10-2876 Extended Life Oil Filter: Automotive)! It has been the BEST oil for me, especially after 3000 miles have been clocked, and the car is as chipper as mile 1!:grin2:

I'll second this....I let Mazda do the first few free oil changes that came with the purchase of the car, but after those were done I've used Royal Purple 0w-20 & the Royal Purple filter and the engine seems to run a little smoother.
 
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Fwiw, I've used (almost exclusively) Schaeffer's 7000 and (now) Amsoil XL for 171000 miles, and my engine is just as clean as can be, top and bottom. I have seen evidence of serious slugging with RP in other engines. Not scientific, but it's out there.

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Subjective vs. objective, I suppose. I ran RP for a short while way back when the car was new, before Shell owned them. The moly content was much higher back then.

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Maybe it does run smoother, I just find this hard to believe based on my own experience.

I've seen engines run with no oil at all on 2 separate occasions. One was my car, a turbo buick 3.8 motor that burned oil and needed to be topped off regularly. During one such top off, it took 5 quarts. That's the entire capacity of this motor, so it had nothing in it other than residual. Ran perfectly smooth before, during and after its time with no oil.

The second time was when i worked at a service station and a taxi came in with a low oil light on. I added 1 quart, checked dipstick....still showed nothing. I repeated this for 5 full quarts before I looked underneath the car to see all the oil on the concrete, as his oil pan drain plug had fallen out.

Put new plug in, filled it up, and off he went. Ran perfect

food for thought
 

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Maybe it does run smoother, I just find this hard to believe based on my own experience.

I've seen engines run with no oil at all on 2 separate occasions. One was my car, a turbo buick 3.8 motor that burned oil and needed to be topped off regularly. During one such top off, it took 5 quarts. That's the entire capacity of this motor, so it had nothing in it other than residual. Ran perfectly smooth before, during and after its time with no oil.

The second time was when i worked at a service station and a taxi came in with a low oil light on. I added 1 quart, checked dipstick....still showed nothing. I repeated this for 5 full quarts before I looked underneath the car to see all the oil on the concrete, as his oil pan drain plug had fallen out.

Put new plug in, filled it up, and off he went. Ran perfect

food for thought

I'm confused at how this has anything to do w/ Royal Purple oil & why you think its bad for an engine.
 

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I'm confused at how this has anything to do w/ Royal Purple oil & why you think its bad for an engine.
I'm confused as to why you think that I think RP is bad for an engine? My comment was in regards to your engine running "smoother" on RP. i don't think differences in "smoothness" can be attributed to a brand of oil, and gave examples of engines running smooth with no oil at all.
 

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I'm confused as to why you think that I think RP is bad for an engine? My comment was in regards to your engine running "smoother" on RP. i don't think differences in "smoothness" can be attributed to a brand of oil, and gave examples of engines running smooth with no oil at all.

My bad, I apologize....I kinda ran w/ your statement and put words in your mouth.


Sorry about that Mach.
 

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Smoove...

I'm confused as to why you think that I think RP is bad for an engine? My comment was in regards to your engine running "smoother" on RP. i don't think differences in "smoothness" can be attributed to a brand of oil, and gave examples of engines running smooth with no oil at all.
Well, truth be told, the real "smooth" for me comes from the octane level GAS I use (Shell or BP 93), however, I tried RedLine oil and after 2500 miles, it did not seem as smooth as it did when I initially changed it...however I have not had that problem w/ RP. It "feels" as good at mile 3000~5000 as it does at mile 1. So I may not have any EMPIRICALdata to support my claims, however I stand by each endorsement I make or recommend. That's what sharing is all about!

Thanks for sharing some alternatives for consideration! Happy New Year to ya!:grin2:
 

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Everything he said. There shouldn't be a debate when it comes to brand new cars and manufacturer knows best otherwise they wouldn't bother putting it in the manual.

0W20 moly all the way for me.
I must disagree. Care makers specify noisy 0W-20 only to meet U. S. CAFE mileage requirements. Have used cheap semi-syn 5W-20 in my 2.5 Mazda engine for past five years, and you cannot hear the engine at idle.
 

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Why did I get email notification of the post above as if it was posted on 7-14-2017?

Things that make you go hmmmmm?

Regardless, reading through this thread again has proven to be rather entertaining! You guys are wasting way to much time and money researching oil related info. and spending extra because of marketing claims!

lower viscosity oil was probably invented sooner rather than later due to fuel economy regulations and the need for auto manufactures to improve fuel economy numbers. This is a good thing...better efficiency and protection, and most engines today have variable valve timing, which is typically controlled by using motor oil as a means to operate these valve timing systems , and thats why the proper viscosity is important.

claims that the skyactiv uses different engineering and needs better oil? Claims that high compression needs better oil? Claims that you sleep better at night after spending three times the amount you probably should have on an oil change because you think you have bought piece of mind....The marketing guys LOVE you!!!!

If your oil is clean(change it at manufactures recommended intervals and remember this is because the oil is dirty, NOT because it has worn out), cool (the proper temp. under operating conditions), the correct viscosity, the correct amount....yeah, i think thats about it. Your good to go. If you sleep better paying $30 for a quart of oil that claims it can do special things...well....see above. Never add additives to your oil. Those of you who may have been around cars for awhile might have noticed the two companies regularly using 0w-20 before anyone else were honda and toyota. Also the two companies known for their outstanding products. Coincidence? probably not. Better engineering seems to go hand in hand with being able to run a thinner oil.
 
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