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Discussion Starter #1
So does anyone know what the FSM recommends? Is it Synthetic or conventional? Also which one do you guys think would be better to use? I know technically synthetic is better than conventional but in some vehicles conventional is more than enough for the motor.
 

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Id go with whatever the FSM would recommend for it. They put a lot of time into doing research on whats the best for it so why not follow their recommendation.
 

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i would go with synthetic no matter what. theyre engineered to lubricate better and outlast conventional oil. the extra price you pay when you buy them is worth the extra protection and longevity that they provide.
 

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Whatever the car came with stock. If you want have constant oil leaks put synthetic in a vehicle with conventional oil in it stock. Synthetic isn't necessarily better and it doesn't last longer, it is thinner so you will have less resistance, but, that isn't necessary in this car.

Now if you are planning to modify the car with forced induction then yes I would say go synthetic.
 

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Discussion Starter #5
So I guess majority would recommend synthetic. I guess for the extra money it will cost me in the long run its worth investing that into the car.
 

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If you decide to go with synthetic, I would suggest your next oil change you take a sample and send it out to be analyzed. Then do the same with synthetic on the oil change after. I bet you won't see much of a difference.
 

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Can you even buy a 0w20 dino oil? This is a rinky-dink 100hp 4-banger with tight tolerances. Granted I don't like oil that pours like water but it's designed for that weight. Even dumping a 5w20 in this engine would probably have a negative impact on mpgs.

I run a synthetic mix in my other 3 cars but they take anything from 5w20 to 10w30.
 

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I used 5w-20 dino juice on my first oil change, and will continue to use it in the future. i agree with one of the above posts, that this is only a 100 hp engine. I really don't see that this engine is being taxed enough to require synthetic for any reason other than fuel economy. By the way, my mileage has not decreased either. If something happens that can be blamed on the type of oil I use, I will let you all know.
 

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Whatever the car came with stock. If you want have constant oil leaks put synthetic in a vehicle with conventional oil in it stock. Synthetic isn't necessarily better and it doesn't last longer, it is thinner so you will have less resistance, but, that isn't necessary in this car.

Now if you are planning to modify the car with forced induction then yes I would say go synthetic.
sorry synthetic oil doesnt leak more or create leaks this is missinformation.i hjave used syn on and off for 30+ years and the oil real difference to the average driver is cost.i have used it in my harleys and 4x4's hotrods and muscle cars.synthetic oil producers say you can get more miles between changes because of its supperior quality..hmmm oil gets dirty from carbon deposits from combustion thats what kills bearings so who cares how long oil will last when they all get dirty at the same speed.do oil changes often and your engine will love you..mazda calls for 0/w20 its only available in synthetic so use it but change often thats the key to a long engine life..
 

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as posted over on mazdas247, the dealer techs that i've been talking to ensure me that 5-20 dino oil will run fine on our 2. That they recommended 0-20 for MPG reasons and that you MIGHT see a slight decrease in MPGs but that it was nothing to worry about.

I went to get my first free oil change on the dealer I bought my 2 from and they gave me the option of going synthetic 0-20 for 25 bux extra or 5-20 dino oil.

The only reason why i went synthetic was because i knew it would take more money to buy the 0-20 synthetic and the filter on my own than the 25 it would have cost me at the dealer.

I recently just bought 5 quarts of mobil 1 0-20 full synthetic with a M1 filter for 32.99 + tax. Manual recommends 4.1 quarts for full fill with oil filter but 4 quarts will be more than enough to get you 3/4 the way to the full line on your dip stick.
 

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bought the car used. Saw the oil change sticker on the window and it says that they put 5w30 for the oil change. Then I researched that the car takes 0w20. So I was like wtf they don't even know what oil to put in. Most will think like, "Oh it's just a regular 4 banger and they commonly run 5w30 or 5w20." Yes it's a very common oil weight but that doesn't mean every car runs it. Well I thought it took a big effect on the MPG but I don't think it played a big role. I say that because I've ran on that oil for a while before I did research on what oil to put in next. So then I changed the oil to Mobile 1 0w20 advanced fuel economy. I really don't see a change in MPG. Probably not dramatically, but I'm pretty sure it does help.
 

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bought the car used. Saw the oil change sticker on the window and it says that they put 5w30 for the oil change. Then I researched that the car takes 0w20. So I was like wtf they don't even know what oil to put in. Most will think like, "Oh it's just a regular 4 banger and they commonly run 5w30 or 5w20." Yes it's a very common oil weight but that doesn't mean every car runs it. Well I thought it took a big effect on the MPG but I don't think it played a big role. I say that because I've ran on that oil for a while before I did research on what oil to put in next. So then I changed the oil to Mobile 1 0w20 advanced fuel economy. I really don't see a change in MPG. Probably not dramatically, but I'm pretty sure it does help.
Use what Mazda says you should and you won't go wrong. Not all engines are created equal. ;)
 

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Not saying that I don't believe in synthetic oil otherwise I wouldn't have made the change. It's just that when I saw that oil change sticker and did some research on what type of oil should be used, I just felt like used car dealerships don't give a **** or just straight cheap.
 

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sorry synthetic oil doesnt leak more or create leaks this is missinformation.i hjave used syn on and off for 30+ years and the oil real difference to the average driver is cost.i have used it in my harleys and 4x4's hotrods and muscle cars.synthetic oil producers say you can get more miles between changes because of its supperior quality..hmmm oil gets dirty from carbon deposits from combustion thats what kills bearings so who cares how long oil will last when they all get dirty at the same speed.do oil changes often and your engine will love you..mazda calls for 0/w20 its only available in synthetic so use it but change often thats the key to a long engine life..
FROM EXPERIENCE: Synthetic does not CAUSE leaks, but it will find leaks. Here's what I mean. I was using dyno oil in my old 2000 CR-V but finally the stuff got so close to Synthetic in price (when on sale) that I said screw it and started running synthetic. Within weeks after the change I started having an oil leak. It was the oil pan gasket which, due to age, had failed. Due to sludge and the conventional oil not flowing as well, the failure wasn't as noticeable. I am sure it was seeping a bit with the conventional oil but the synthetic leaked.

So what to do? Well, I did what any anal car owner would do; I paid the freight and replaced the oil pan gasket.

As far as this discussion, if you go to the parts houses, they run a special of 5 quarts of the "synthetic of the month" and a filter for around $30 bucks. At that price, I have absolutely no idea why anyone would run anything else. Now you can go to bobistheoilguy.com and get into the pissing contest of which synthetic is better, but really, even the most generic of synthetic is better than conventional. The motor oil doesn't just lubricate on a modern engine, but rather it acts as the hydraulic oil for all of the variable valve timing stuff as well as, to an extent, it's being used as coolant. SO you know, it's cheap insurance, every 5000 miles I do an oil change and I use synthetic.
 
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