Best oil for the Renesis?
10-27-2004, 10:54 AM
#3
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I used Penzoil at first but switch to Castrol (just because I use it in everything else I have) and found that the Castrol leaves a little less soot funk on the pipes.
Last edited by Phlash69; 10-27-2004 at 11:29 AM.
10-27-2004, 11:27 AM
#5
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i agree, you will get many responses. i have almost 800 miles on mine and changed my oil at 586 miles with castrol gtx.(5w-20) i bought a mazda filter for the first change, but plan on using a k&n filter. i also will be changing my oil and filter every 3k miles.
yamajj
yamajj
10-27-2004, 01:04 PM
#6
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I use Mobil1 10w30 because it's widely available, tolerates extra heat, flows well, and I've been inside engines that ran Mobil1 and was amazed at the cleanliness. No I'm not worried about it being synthetic or the "wrong" weight.
10-27-2004, 01:20 PM
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I've been using Castrol Syntec, which from my understanding is simply extra purified dino oil with added synthetic detergents. Have been considering switching to Royal Purple.
10-27-2004, 01:27 PM
#8
10-27-2004, 01:54 PM
#10
Metatron
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Navydood....
If you research the specs, the Castrol 0w30 is a MUCH better oil, in every way.
(and no, it's not too thin, at 12.2 centistokes,it is actually THICKER than the 10w30!)
Link to analysis...
S
(and no, it's not too thin, at 12.2 centistokes,it is actually THICKER than the 10w30!)
Link to analysis...
S
10-27-2004, 02:09 PM
#11
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I was talking to my service guy just this morning while getting a free oil change at the Mazda dealer here. First off, he was bragging that MazdaUSA rates them as the #8 service department in the country. That would lead me to believe that they know what they are talking about. Secondly, they made it clear that they would ONLY use Valvoline 5w-20 for the RX-8.
I make no claims on this, just thought I'd pass the info from them onto you.
I make no claims on this, just thought I'd pass the info from them onto you.
10-27-2004, 02:09 PM
#12
If you drive your car hard i suggest a synthetic, Mobil 1 is a good dino oil if you’re willing to run 5w-30, I however air on the side of caution and go with Castrol Part-Synthetic 5w-20.
I change my oil and filter ever 2500 miles, Advantages of part-syntx is that if your still going to have your dealer do the 5000 mile services then its harder to notice (visually yeah yeah yeah) that it's synthetic oil especially because it mixes with 3quarts of whatever you had in the engine before because you can't drain the oil coolers.
Now as for the Rumors about synthetics not being good for Rotaries yada yada. In my opinion there are 2 ways to look at it. Some say that you shouldn't use syntx because the oil seals in the rotor require a certain amount of friction to seal properly, and syntx coefficient of friction is too low, they believe the best type of oil to use is mineral.
The reason i say that if you drive your car hard, especially for extended periods of time (ex. track, i would never take my car to the track without syntx), is use Synthetic because it burns at a higher temperature but the flash points are the same as Natural oils.
Far as the best oil i would say is Idemitsu http://www.idemitsu-usa.com/
They make Rotary engine specific oil, and once they come out with a 5w-20 for the 8 I don't think they'll be much contest to whose the best for our car. They also supply Mazda with OEM oil, so im going to hazard a guess and say that the oil at least from the factory that’s put in our cars is a synthetic, but that’s just a guess.
I change my oil and filter ever 2500 miles, Advantages of part-syntx is that if your still going to have your dealer do the 5000 mile services then its harder to notice (visually yeah yeah yeah) that it's synthetic oil especially because it mixes with 3quarts of whatever you had in the engine before because you can't drain the oil coolers.
Now as for the Rumors about synthetics not being good for Rotaries yada yada. In my opinion there are 2 ways to look at it. Some say that you shouldn't use syntx because the oil seals in the rotor require a certain amount of friction to seal properly, and syntx coefficient of friction is too low, they believe the best type of oil to use is mineral.
The reason i say that if you drive your car hard, especially for extended periods of time (ex. track, i would never take my car to the track without syntx), is use Synthetic because it burns at a higher temperature but the flash points are the same as Natural oils.
Far as the best oil i would say is Idemitsu http://www.idemitsu-usa.com/
They make Rotary engine specific oil, and once they come out with a 5w-20 for the 8 I don't think they'll be much contest to whose the best for our car. They also supply Mazda with OEM oil, so im going to hazard a guess and say that the oil at least from the factory that’s put in our cars is a synthetic, but that’s just a guess.
10-27-2004, 02:52 PM
#13
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Originally Posted by Nubo
I use Mobil1 10w30 because it's widely available, tolerates extra heat, flows well, and I've been inside engines that ran Mobil1 and was amazed at the cleanliness. No I'm not worried about it being synthetic or the "wrong" weight.
you've been inside engines that ran mobil1? just how tall are you? :D
it's just a joke, i now return you to your oil debate.
yamajj
10-27-2004, 04:12 PM
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Valvoline here, I used Pennzoil at first, and the difference in color between the two is amazing - Valvoline looks much lighter, while Pennzoil is almost a coffee color even when new. My dad (a mechanic) told me that Pennzoil got into a lot of trouble for using recycled oil and selling it as new. After seeing the two next to each other, I think they're still using recycled oil.
-arattle
-arattle
10-27-2004, 08:04 PM
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i'm topping up with castrol syntec blend, 5w-20. i've heard the pros and cons of using synthetics so it seems like a good compromise. it meets the API SL / ILSAC requirement noted in the manual. the price is right, too.
10-27-2004, 08:37 PM
#20
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Originally Posted by jakes8
i'm topping up with castrol syntec blend, 5w-20. i've heard the pros and cons of using synthetics so it seems like a good compromise. it meets the API SL / ILSAC requirement noted in the manual. the price is right, too.
Great minds think alike. :D
The Idemitsu (sp?) sounds interesting. Anyone on here using it?
10-27-2004, 08:59 PM
#21
Rangers Lead The Way!
I am a die hard believer in Royal Purple.. I use 5w20 in my 8 and have not had any problems.. and no more soot out of the exhaust either! I plan on changing the filter every 2500 and the oil every 7500
Though, I don't recommend using a synthetic until you have 2500+ miles on the car.. that way the seals can properly set.. or so I was told by several rotary mechanics..
Though, I don't recommend using a synthetic until you have 2500+ miles on the car.. that way the seals can properly set.. or so I was told by several rotary mechanics..
Last edited by philodox; 10-27-2004 at 09:53 PM.
10-27-2004, 10:22 PM
#23
I refuse to use pensoil on any of my cars. It tends to "sludge" very easily.
10-27-2004, 10:36 PM
#24
Originally Posted by SDB
I would be interested in the evidence behind this. I recently read of an oil study by an independent testing lab that showed Pennzoil had a much better additive package than any of the competitors including Castrol. I think that the important thing is to change the oil and filter regularly with a quality brand. My RX7 went to 140000 without any engine problems and was still going strong when I sold it. I used all types of oil but it was changed regularly.
10-27-2004, 11:05 PM
#25
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Didn't I ask this exact question a couple weeks ago and get excoriated with "use the search, stupid" and "close this thread"? You guys are so unpredictable. :p