85w140
05-15-2010, 03:36 PM
#1
Trained true Killers
Thread Starter
85w140
Just bought 85w140 for my trans I will be putting it in on Sunday. I figure to lose 1hp do to the thickness but will make up big ground in the life of my trans. Hope I am right. 
Will update if my trans blows
Will update if my trans blows
05-15-2010, 06:14 PM
#5
He's as bad as Can
85w140 should make shifting fun on those cold Missouri winter days.
I myself use Redline MT90 which is a 75w90 and my trans has had no issues after 143,000 miles.
I myself use Redline MT90 which is a 75w90 and my trans has had no issues after 143,000 miles.
05-16-2010, 04:22 PM
#9
Get that out of there, it isn't designed to work with soft metals/trans synchronizers
if you want to use a heavier fluid the get the Redline 75W140NS. Make sure you get the NS designation intended for trans use as they also make a regular 75W140 for rear differential use
if you want to use a heavier fluid the get the Redline 75W140NS. Make sure you get the NS designation intended for trans use as they also make a regular 75W140 for rear differential use
05-16-2010, 07:25 PM
#10
Trained true Killers
Thread Starter
Get that out of there, it isn't designed to work with soft metals/trans synchronizers
if you want to use a heavier fluid the get the Redline 75W140NS. Make sure you get the NS designation intended for trans use as they also make a regular 75W140 for rear differential use
if you want to use a heavier fluid the get the Redline 75W140NS. Make sure you get the NS designation intended for trans use as they also make a regular 75W140 for rear differential use
Thanks for looking out however
05-17-2010, 05:28 PM
#12
Trained true Killers
Thread Starter
Dont know but have thrown down about 220mi so far and my trans in shifting much better then the Royal Purple. My only thought was that RP was way to slick and was F-ing with my sync's. Pops right into gear no issues but if one arise I will post right away. One more point I did notice my trans felt much cooler then before. I kind of feel like I am in uncharted taritory so we will see.
05-18-2010, 01:40 AM
#14
Lubricious
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Dont know but have thrown down about 220mi so far and my trans in shifting much better then the Royal Purple. My only thought was that RP was way to slick and was F-ing with my sync's. Pops right into gear no issues but if one arise I will post right away. One more point I did notice my trans felt much cooler then before. I kind of feel like I am in uncharted taritory so we will see.
05-18-2010, 06:55 AM
#17
Trained true Killers
Thread Starter
No your right Ken and that was my plan until the only GL4 the auto parts store had was the straight 140 and I had to get the RP out ASAP. Trans fluid is easy to change so if a problem starts I will solve it quickly. there is only one draw back that I see is maby a loss of 1hp do to the thicker oil but I also see two good sides being cooler trans and reduced gear wear. Lets also remember that Mazda did every thing they could to get as many MPG out of the 8 as they could to keep the EPA happy and thin oil in the motor and trans helped them reach there goals, but at the cost of reliability. Just one mans thought
05-18-2010, 10:22 AM
#18
Registered
When it comes to gears you want the thinnest oil you can use that still does it's job. That applies to all oils though. On gears if the oil is too thick, it won't get to the bottom of the teeth and that's where the wear will be. If the oil is too thin there will be little wear at the bottom but all on top. Why are you running that stuff? Thicker is NOT necessarily stronger or better. Keep in mind that gears have different lubricating requirements than bearings do. Bearings need a more robust oil than gears! Viscosity is also not measured the same between engine oil and gear oil. 75W in gear oil is not 75W in motor oil. It is actually about 15W! An 85W gear oil is equivalent to a middle of the road 30W motor oil.
You are going to get a couple of things out of running that oil. Your transmission temps will go up. Your parasitic losses will go up. Your gear wear will go up.
You are going to get a couple of things out of running that oil. Your transmission temps will go up. Your parasitic losses will go up. Your gear wear will go up.
05-18-2010, 04:53 PM
#20
Trained true Killers
Thread Starter
When it comes to gears you want the thinnest oil you can use that still does it's job. That applies to all oils though. On gears if the oil is too thick, it won't get to the bottom of the teeth and that's where the wear will be. If the oil is too thin there will be little wear at the bottom but all on top. Why are you running that stuff? Thicker is NOT necessarily stronger or better. Keep in mind that gears have different lubricating requirements than bearings do. Bearings need a more robust oil than gears! Viscosity is also not measured the same between engine oil and gear oil. 75W in gear oil is not 75W in motor oil. It is actually about 15W! An 85W gear oil is equivalent to a middle of the road 30W motor oil.
You are going to get a couple of things out of running that oil. Your transmission temps will go up. Your parasitic losses will go up. Your gear wear will go up.
You are going to get a couple of things out of running that oil. Your transmission temps will go up. Your parasitic losses will go up. Your gear wear will go up.
05-21-2010, 08:51 AM
#22
Registered
Well 400 mi now no problems feels great but seeing as Rotary God had to chime in and destroy my party I better change it out this weekend affter all he knows a little more then me...... well a lot more. I just wish you would have jumped in a little sooner but thats all right more quality time with my 8
05-21-2010, 04:37 PM
#24
We don't believe your claimed HP hype, which likely exlains why it works fine for you and everyone else breaks
the FD3 trans is only a 5 speed and is well known to be stronger than the RX-8 transmission
.
Last edited by TeamRX8; 05-21-2010 at 04:40 PM.
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