Cumulative Synthetic Oil Discussion
#726
Out of NYC
iTrader: (1)
I haven't quite understood what the argument against synthetic oil for the rotary is (other than Mazda says so).
Equally, I haven't quite understood why a heavier weight oil is considered bad in a rotary.
Can someone explain these items as concisely as possible?
I bought my car used with 12,000 miles on it and have put on another 9k getting the oil changed by the dealer. I am a 4 season driver in Chicago and am looking to find the oil which will protect my engine the most, and won't cause any problems because it doesn't burn off, or work itself around in the cold or whatever other arguments may exist...
I am looking for what to use, but more than that I am looking for explanations of WHY to use it...(why it protects better)
Equally, I haven't quite understood why a heavier weight oil is considered bad in a rotary.
Can someone explain these items as concisely as possible?
I bought my car used with 12,000 miles on it and have put on another 9k getting the oil changed by the dealer. I am a 4 season driver in Chicago and am looking to find the oil which will protect my engine the most, and won't cause any problems because it doesn't burn off, or work itself around in the cold or whatever other arguments may exist...
I am looking for what to use, but more than that I am looking for explanations of WHY to use it...(why it protects better)
So after that, Mazda took the "better be safe than sorry" path and said "we do not recommend" Synthetic oil thinggy into their instruction.
Now we're in at the end of 2008 but Many many MANY people still living in the past, they simply refuse to accept the fact that technology DOES improve overtime, same thing for synthetic oil. not to mention it wasn't even Synthetic oil's fault. it was the cheap seal that Mazda used cause the problem. Those oil works with any other piston motor back then without issues. so whos fault was it really ?
What I find funny is that Mazda recommend 5w-20, at the same time they do not recommend Synthetic oil. But ALL 5w20 oil contains Synthetic oil inside them, so ... Did Mazda just slapped themself in da head again ?
u're in Chicago right? Not that far from NYC. I suggest you to use something like 5w-30, I personally use 10w-40. will switch to 5w-40 when Im back to NYC sometime next month. (Im on my vacation right now , far far far away from NYC)
hello guys i m from asia, i live in Bangladesh and recently i have imported a used rx8
from japan now its time to change the engine oil,oil finter,air filter etc. I am concern with
the engine oil because in here we dont have minarel or 5w-20 grade engine oil and i
cannot import the engine oil due to some rules and beriars.In here we have 10w-40 or
5w-50 mobil 1 fully synthetic oil aviable and many other rx8 owners using it for 2 and half
years and they are running well but according to the mazda manul and the conflict
between 5w-20 vs synthetic, i m very much confused what should i do or which grade
should use for my rx8 so can u guys help me out by giveing me some suggetion about the
engine oil it will help me a lot..................thx
from japan now its time to change the engine oil,oil finter,air filter etc. I am concern with
the engine oil because in here we dont have minarel or 5w-20 grade engine oil and i
cannot import the engine oil due to some rules and beriars.In here we have 10w-40 or
5w-50 mobil 1 fully synthetic oil aviable and many other rx8 owners using it for 2 and half
years and they are running well but according to the mazda manul and the conflict
between 5w-20 vs synthetic, i m very much confused what should i do or which grade
should use for my rx8 so can u guys help me out by giveing me some suggetion about the
engine oil it will help me a lot..................thx
Oh hello my friend from Bangladesh, you will be fine using 5w-50 Mobil1 or 10w-40, I think you should use something like 20w50 for your area. it should not be hard to find 20w50.
Last edited by nycgps; 12-29-2008 at 01:16 PM.
#727
Super Moderator
Use a 10 or 15W40 or yes a 20w50 will be fine for Bangladesh.
#728
Hmmmmmm.........
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It was my understanding that the JDM manual has no clause for synthetic oil. Also as has been stated, the manual states different oil weights for different climates, I am guessing a 10W40 would be the starting point for you.
#729
Registered User
GTX 5w20 is what you need, i live in soth florida 90+ and it runs perfect, no one knows what oil to run, so just get what mazda tell you to, you guys act like it will run better with Synthetic
Last edited by ferg; 12-29-2008 at 07:06 PM.
#730
Rotary Crawfish
5W-20 is too damn thin for a hot climate, you may get away with it but I will not risk a $30.000 dollar car on thin *** oils!
As a rotary owner since 1986 I have never run less than 20W-50 Castrol GTX in any roto motor. Both of my RX7's went well over 200,000 miles with 75 psi oil pressure at all times.
The fact that the EPA ****'s want 5W-20 for emissions and half of a percent MPG increase bothers me not one bit. I will run what is good for the engine, F@#K the 1-2 miles per gallon decrease.
As a rotary owner since 1986 I have never run less than 20W-50 Castrol GTX in any roto motor. Both of my RX7's went well over 200,000 miles with 75 psi oil pressure at all times.
The fact that the EPA ****'s want 5W-20 for emissions and half of a percent MPG increase bothers me not one bit. I will run what is good for the engine, F@#K the 1-2 miles per gallon decrease.
#732
Registered User
well i know alot of peaple who has been in the rx family for a long time and they say 5w30 or 20 for florida, and i drive 8 hour days in it, starting and stoping for 100 miles,with out highways, i rev 5 time and gun the car alot and its perfect , i even take it to the track, i went thru tires 2 times last year
Last edited by ferg; 12-29-2008 at 08:23 PM.
#733
Super Moderator
5W-20 is too damn thin for a hot climate, you may get away with it but I will not risk a $30.000 dollar car on thin *** oils!
As a rotary owner since 1986 I have never run less than 20W-50 Castrol GTX in any roto motor. Both of my RX7's went well over 200,000 miles with 75 psi oil pressure at all times.
The fact that the EPA ****'s want 5W-20 for emissions and half of a percent MPG increase bothers me not one bit. I will run what is good for the engine, F@#K the 1-2 miles per gallon decrease.
As a rotary owner since 1986 I have never run less than 20W-50 Castrol GTX in any roto motor. Both of my RX7's went well over 200,000 miles with 75 psi oil pressure at all times.
The fact that the EPA ****'s want 5W-20 for emissions and half of a percent MPG increase bothers me not one bit. I will run what is good for the engine, F@#K the 1-2 miles per gallon decrease.
I think the US manual says only a 5W-20, for the reasons you stated, emissions and MPG, that is all.
I will and would go for PROTECTION rather than the other two reasons.
The RENESIS can handle the thicker oils fine there are no differences in oil galleries for rotors or eccentric shaft of past 13B's, so you don't have to use a thin oil.
Yes the thinner oil is better for COLD start ups, but that is about all, I still do not think it has enough viscosity or protection when it is hot outside. There have been many examples of chewed out rotor bearings and damage to the eccentric shaft.
I can not confirm this is because of the 5w20 oils, however in the OLD days we only used 20W50 oils and very rarely witnessed ANY bearing or shaft damage.
In fact when I was a Mazda Parts Manager in the 70's, 80's and early 90's I could count on one hand the number of rotor bearings we sold at my Mazda Dealership, I never sold an eccentric shaft or new rotor, but hundreds of seal and gasket kits for the 10A,12A and 13B.
Please I am not suggesting the 5w20 is bad, I just don't like it, I would at least go for the 5w30 as a minimum.
#734
Power!!
well i know alot of peaple who has been in the rx family for a long time and they say 5w30 or 20 for florida, and i drive 8 hour days in it, starting and stoping for 100 miles,with out highways, i rev 5 time and gun the car alot and its perfect , i even take it to the track, i went thru tires 2 times last year
5W-20 is too thin.
#735
Zoom-Freakin'-Zoom
iTrader: (5)
well i know alot of peaple who has been in the rx family for a long time and they say 5w30 or 20 for florida, and i drive 8 hour days in it, starting and stoping for 100 miles,with out highways, i rev 5 time and gun the car alot and its perfect , i even take it to the track, i went thru tires 2 times last year
and how many miles on you car? and what tires did you go thru ?
what track / tracks..
your advice is less than good.
beers
#736
thx Nubo,spicez, nycgps,ash8,auzoom,freg and all of u friends now i m quite relife
by looking at these posts...... well its true its really hot in summer but now we
have winter going on, it wont be a problem if i use a fully synth oil right now i
guess bcoz hot season is about to come very soon.......well i will see how better i
can match up with these above suggestion and i will let u guys know what im
gonna use.......thx to all of u once again.
by looking at these posts...... well its true its really hot in summer but now we
have winter going on, it wont be a problem if i use a fully synth oil right now i
guess bcoz hot season is about to come very soon.......well i will see how better i
can match up with these above suggestion and i will let u guys know what im
gonna use.......thx to all of u once again.
#737
Out of NYC
iTrader: (1)
well i know alot of peaple who has been in the rx family for a long time and they say 5w30 or 20 for florida, and i drive 8 hour days in it, starting and stoping for 100 miles,with out highways, i rev 5 time and gun the car alot and its perfect , i even take it to the track, i went thru tires 2 times last year
thx Nubo,spicez, nycgps,ash8,auzoom,freg and all of u friends now i m quite relife
by looking at these posts...... well its true its really hot in summer but now we
have winter going on, it wont be a problem if i use a fully synth oil right now i
guess bcoz hot season is about to come very soon.......well i will see how better i
can match up with these above suggestion and i will let u guys know what im
gonna use.......thx to all of u once again.
by looking at these posts...... well its true its really hot in summer but now we
have winter going on, it wont be a problem if i use a fully synth oil right now i
guess bcoz hot season is about to come very soon.......well i will see how better i
can match up with these above suggestion and i will let u guys know what im
gonna use.......thx to all of u once again.
#738
Rotary wanabee
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Using Mobile 1 5w20 Full Synthetic.
Honestly I am not sure.... I Don't notice enough changes to not just stick with synthetic blend?
Questions -- I live on Long Island (NY) -- would there be a different oil weight recommended for the summer / winter? Any difference -- To be honest I was thinking of using 5w30 In the summer and 5w20 in the winter.
Honestly I am not sure.... I Don't notice enough changes to not just stick with synthetic blend?
Questions -- I live on Long Island (NY) -- would there be a different oil weight recommended for the summer / winter? Any difference -- To be honest I was thinking of using 5w30 In the summer and 5w20 in the winter.
#739
Super Moderator
Using Mobile 1 5w20 Full Synthetic.
Honestly I am not sure.... I Don't notice enough changes to not just stick with synthetic blend?
Questions -- I live on Long Island (NY) -- would there be a different oil weight recommended for the summer / winter? Any difference -- To be honest I was thinking of using 5w30 In the summer and 5w20 in the winter.
Honestly I am not sure.... I Don't notice enough changes to not just stick with synthetic blend?
Questions -- I live on Long Island (NY) -- would there be a different oil weight recommended for the summer / winter? Any difference -- To be honest I was thinking of using 5w30 In the summer and 5w20 in the winter.
#740
Super Moderator
No one knows ? Just because Mazda didn't say it, doesnt mean that it won't work. Not to mention there is a chart in every single manual that tells you to use the "right" oil that matches ur local climate. I guess you missed that part.
That simply means you dont know anything about your motor in general. Please come back when you do.
I'll repeat this again, 20w50 is what you need for your local climate.
That simply means you dont know anything about your motor in general. Please come back when you do.
I'll repeat this again, 20w50 is what you need for your local climate.
#743
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Join Date: Jan 2008
Location: Montreal,QC
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I use ESSO Extra XD Synthetic, 0w40 here in Montreal.
Its -20c/-4f here right now. Works great plus I never get that slugish slow start at -40 I would get with 5w30 dino or synthetic. The 0w does make a difference in my case anyways.
Its -20c/-4f here right now. Works great plus I never get that slugish slow start at -40 I would get with 5w30 dino or synthetic. The 0w does make a difference in my case anyways.
#744
Registered User
ok i just picked up VR1 Racing Motor 20w50 & K&N oil filter, im going to put the oil in today, ill see how it runs, all im saying is, im just going to try it my self, i always left 5W20 in it, is this oil ok?
#745
Rotary Crawfish
Ferg, the point is you do what you feel is right, I and others like me will do what we feel is fight.
I am running 10W-40 in the 8 now because I do like some fuel mileage and it is not a daily driver just my play toy.
Considering that the rotary world market spec is 5-30 or better, only the USA has a hardon for 5W-20 so I will go with a heavier weight oil.
Louisiana is a hot azz place!!!
I am running 10W-40 in the 8 now because I do like some fuel mileage and it is not a daily driver just my play toy.
Considering that the rotary world market spec is 5-30 or better, only the USA has a hardon for 5W-20 so I will go with a heavier weight oil.
Louisiana is a hot azz place!!!
#747
Lubricious
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Your oil metering pump will still inject the same amount of oil so your oil consumption should stay about the same.
Keep in mind that a good portion of old oil remains behind in the oil coolers. After your first change from 5w20, your viscosity won't be nearly 20W50; it will take a couple of oil changes for that.