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Originally Posted by Gokhan Go ahead and post the pictures of the European, Japanese, and/or Australian manuals and let's see if any of them recommends 5W-30 without recommending 0W-20. You also keep ignoring the fact that nowhere in your manual it says synthetic 5W-30, and the Mexican OCI is...

Originally Posted by Gokhan Yes, your owner's manual is the North American owner's manual. "Except U.S.A., Canada, and Puerto Rico" in North America is Mexico. "(Mexico)" is also explicitly written above the 5W-30 recommendation. I posted the global owner's manual in my link. If you insist...

Originally Posted by Gokhan Originally Posted by sjd So why does Mazda recommend 5W30 everywhere else in the world except Canada and the U.S.? No, only in Mexico, because synthetic oil is too expensive there. However, the 5W-30 recommendation in Mexico comes with a reduced OCI in that country...

Originally Posted by Oildudeny No benefits in running anything but 0w20 with that engine.. and its readily available Originally Posted by Gokhan 0W-20 oils have far better base-oil quality than 5W-30 oils, which means you will have less intake-valve deposits and turbocharger deposits with a...

Originally Posted by AC1DD I'm suggesting that the car manufacturer knows their vehicle best and if their engineers recommend something there is a good reason for it. When the warranty is over do as you please but if you have a warranty in effect use the recommended specifications. The car...

Originally Posted by AC1DD Bottom line if a manufacturer specifies GL-4 fluid...USE ONLY GL-4 fluid, not GL-4/5, GL-4+,ect GL-4 is not actually "obsolete" because some manufactures STILL specify it for new cars sold today. Even if API says it is. A MAJOR issue using some fluids that indicate...

Originally Posted by Bill_W A MT manufacturer has the option to select what EP additive will work the best in it's transmission if they have their own MT oil product. Also the amount installed in the oil. What gets me about Mazda's requirement was if the OEM 75w-90 oil was not available then...

Originally Posted by Brian553 I'm unaware of any GL-5 MTFs. Motul gear 300 is edging on saying it's designed for MTs with "For synchronised or not synchronised gearboxes..." but that isn't communication to me that it has the correct friction modification to assist (/for) synchros. Subaru used...

I found some more information from MolaKule. Not sure why these posts aren't stickied as they answer a lot of common questions here. Some fantastic takeaways about dual rated GL-4/GL-5 fluids. His words are italicized. GL-4; Specified for hypoid gear service under severe service but without...

Originally Posted by Bill_W Wondered if this view can help? https://www.widman.biz/uploads/Transaxle_oil.pdf So you're posting something from a Corvair enthusiast? Those are 60 year transmissions. What are his credentials? My point is that the actual quality of the oil makes the difference...

Originally Posted by MolaKule I am not sure what Shannow had in mind since he didn't post a link regarding his statement. What specific brand of fluid and viscosity are you running and for what vehicle? Now Subaru had an "S" version of their transaxle fluid which had a common sump for the...

Originally Posted by Bill_W If you look at GL-4 and GL-5 you can see it goes way back. The GL-4 has some very modern formulations which means improvements in the package. We all have our reasons to choose our fluid. Personally I like a modern formulation of what Mazda has asked for for my 2019...

Originally Posted by MolaKule What specific technical information are you looking for? The statement that you "can't do a GL-4/5" or whatever that means. As I posted above, I have run a GL-4/GL-5 oil in a transmission that recommend GL-4 and am taking heat for it from people with no science...

A fantastic thread on here explaining GL-4 and GL-5 with some excellent information from Bob. https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/501240/1

Originally Posted by MolaKule If this is for your manual transmission here is a list of MTF oils with GL-4 ratings in the 75W90 grade: 1. Amsoil MTG 2. Redline MT-90 3. Castrol Syntrans Multivehicle 75W-90 4. Castrol Syntrans Transaxle 75w-90 5. Ford XT-75W90-QGT 6. Ford MOTORCRAFT®...

Originally Posted by Farnsworth On a 2019 Miata I would think it doesn't need changing or if someone wants to flush wear particles away they would buy correct Mazda oil from a dealer. Car cost some money I just don't understand trying to fix it from the state it was as delivered. They do a lot...

There is some debate on fluids for the most recent generations of MX-5. Yes, Mazda recommends GL-4 fluid in the transmission. However some of us use GL-4/GL-5 recommended fluid for better protection/performance, specifically the Motul Gear 300, and a lot of others think we're wrong. I am of...

So I will weigh in because I'm the one I'm that Bill is trying to argue against. The argument is this: Mazda recommends GL-4 fluid in the transmission. Some of us use GL-4/GL-5 recommended fluid for better protection/performance, in my case Motul Gear 300, and a lot of others think we're...

I don't know if any other Mazda dealers do, Dave Wood is pretty involved in motorsports and they build a lot of cars for Mazda since they are right down the highway from Mazda Canada's head office.

Originally Posted By: addyguy Sorry to hijack the thread, but what dealership in Ontario has Motul availiable? No problem. It's Dave Wood Mazda in Newmarket.