Cumulative Synthetic Oil Discussion
#1302
So I just had my engine replaced under warranty at 99k. You can mosey on over to the new engine club thread if you're interested in hearing how it died.
At any rate, I got to hear the dealer/Mazda perspective on "no synthetic oil" and it got me thinking. Coupled with their demands for oil change records, I suspect the main reason they don't want people using synthetics is because of the oil drain interval. They want people topping off the oil and making sure it's changed, and not thinking everything will be hunky-dory because they used synthetic oil rated to 20,000 miles and they don't ever have to change or fill it.
I don't know. Maybe that's too simplistic or I don't understand the issue. The talk about how synthetic "coats" the engine and doesn't burn. But my car had poorer compression after they ran engine solvent through the motor and let it sit for a night, so it seems like there's more of a wear problem than a carbon problem out there these days.
At any rate, I got to hear the dealer/Mazda perspective on "no synthetic oil" and it got me thinking. Coupled with their demands for oil change records, I suspect the main reason they don't want people using synthetics is because of the oil drain interval. They want people topping off the oil and making sure it's changed, and not thinking everything will be hunky-dory because they used synthetic oil rated to 20,000 miles and they don't ever have to change or fill it.
I don't know. Maybe that's too simplistic or I don't understand the issue. The talk about how synthetic "coats" the engine and doesn't burn. But my car had poorer compression after they ran engine solvent through the motor and let it sit for a night, so it seems like there's more of a wear problem than a carbon problem out there these days.
#1304
Registered
At any rate, I got to hear the dealer/Mazda perspective on "no synthetic oil" and it got me thinking. Coupled with their demands for oil change records, I suspect the main reason they don't want people using synthetics is because of the oil drain interval. They want people topping off the oil and making sure it's changed, and not thinking everything will be hunky-dory because they used synthetic oil rated to 20,000 miles and they don't ever have to change or fill it.
I stated this back then and even zoom44 was standing next to me during the discussion. I even relayed this info here and yet people still kept speculating as to what the issue was. This is it. I got it straight from the mouth of the highest rotary engine person in the world. There is no one with an opinion who knows better than he does. Some people just don't want to know.
I don't know. Maybe that's too simplistic or I don't understand the issue. The talk about how synthetic "coats" the engine and doesn't burn. But my car had poorer compression after they ran engine solvent through the motor and let it sit for a night, so it seems like there's more of a wear problem than a carbon problem out there these days.
#1305
Oil formulations change so fast that the "issue" they have with one oil could show up or disappear before your next oil change.
It would be nice if they would explain the exact specs that are good or bad.
A well known 0w40 is tested against ACEA A3 standard with 4 different German manufacturers, but is the rotary tested to a stated standard?
Idemitsu is the only oil I know of that is actually advertised for use in the rotary, and it has no test specs, only testimonials.
Even those German car owners can't decide what to use, and they have a severe test spec.
So we all just use what we want, and use longevity stories to decide.
It would be nice if they would explain the exact specs that are good or bad.
A well known 0w40 is tested against ACEA A3 standard with 4 different German manufacturers, but is the rotary tested to a stated standard?
Idemitsu is the only oil I know of that is actually advertised for use in the rotary, and it has no test specs, only testimonials.
Even those German car owners can't decide what to use, and they have a severe test spec.
So we all just use what we want, and use longevity stories to decide.
Last edited by REDRX3RX8; 07-02-2010 at 01:23 PM. Reason: info
#1306
Registered
There have been engine failures using every type of oil out there. There is always more to the story than gets talked about but many immediately blame the oil and then pass it on. Opinions can be based on this when it may have nothing to do with the failure.
#1307
Super Moderator
Would just like to say that ALL Rotors in EVERY Rotary Engine ever made that uses Petroleum as a Fuel or Gas will have Carbon, Soot or Black Ash or Black/Grey/Beige Crud on it.
I seem to get the impression that the "type" of oil will completely reduce the Carbon Build up inside On rotors...this is incorrect...there will always be carbon present.
Now Hydrogen as a Fuel, that is another story...why do you think Mazda loves it...hey Fred
I seem to get the impression that the "type" of oil will completely reduce the Carbon Build up inside On rotors...this is incorrect...there will always be carbon present.
Now Hydrogen as a Fuel, that is another story...why do you think Mazda loves it...hey Fred
#1308
I stated this back then and even zoom44 was standing next to me during the discussion. I even relayed this info here and yet people still kept speculating as to what the issue was. This is it. I got it straight from the mouth of the highest rotary engine person in the world. There is no one with an opinion who knows better than he does. Some people just don't want to know.
I shouldn't have said "the main reason". That was a poor choice of words.
At the same time, I was struck by the obsession on oil change interval, and thought it might be connected. When I brought it in, they didn't ask if I ran synthetic, they asked if I changed the oil often. Which I thought was interesting in light of the later blanket disapproval of syn when I left.
-z
#1310
Registered
Most carbon buildup in the engine is the result of GASOLINE!!! Hydrogen would definitely leave a much cleaner motor inside as would propane, natural gas, and even methanol or straight ethanol. Gasoline is just dirty dirty stuff that doesn't burn fast enough to burn cleanly in an internal combustion engine. In an external combustion engine it could be made to burn very cleanly, much like coal can even be made to burn cleanly.
#1311
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FazdaRX_8
You can mix dino and synth oil. Doesnt matter.
Just switch to whatever synth oil you prefer. After a couple of oil changes you'll be 100% synth, in between you might be 90-95%... doesnt matter in the slightest.
You can mix dino and synth oil. Doesnt matter.
Just switch to whatever synth oil you prefer. After a couple of oil changes you'll be 100% synth, in between you might be 90-95%... doesnt matter in the slightest.
#1312
It has nothing to do with the fact that synthetics in general are bad and conventionals are good but rather with the fact that they found an issue that concerned them with A certain synthetic oil that just so happens to be the most widely used synthetic in the world. .
#1313
#1316
Registered
There is a certain additive that they use in THEIR synthetics that apparently is cause for concern. They apparently don't use this additive in their conventional oils. I don't know what it is or if anyone else uses it though. It isn't an issue with the synthetic base stock itself. Once upon a time long ago when synthetics were still fairly young, there were issues with PAO based synthetics causing seals to swell. Fortunately it is now understood and is dealt with in the formulations.
#1321
I drive at Red Line.
iTrader: (1)
ok so the Idemitsu Racing Rotary Fuel Lube is half syn/half conventional or whatever the ratio is. I know its bad to mix syn with regular oil, so is this stuff safe to add to the gas or not? I'm using regular oil in the engine and im not sure yet if I want to go mixing the two together.
#1323
Super Moderator
MMMmmmmm......lol
#1325
zoom fuckin zoom
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I switched to Pennzoil 5w30 synthetic (on sale) from 5w30 castrol today, as hot as its been this summer I cant see regular oil hacking it after 3000miles in this heat, Im sure it will burn off fine and as far as the cat an AP midpipe/cobb is in the immediate future.