Redline Gear Oil
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Senior Member
Joined: Sep 2001
Posts: 565
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From: Marietta, Georgia
So the Winner is -- Redline Gear Oil in the tranny ding ding ding -- thanks alot fellas -- I'll use it and see if it fixes that god awful grinding --
by the way --according to Haynes for the 86-91 models the manual trans takes 2.6 quarts....
thanks
by the way --according to Haynes for the 86-91 models the manual trans takes 2.6 quarts....
thanks
Full Member
Joined: Aug 2001
Posts: 112
Likes: 0
From: Northern New Jersey
DroptopRX-7:
As an attorney, I disagree somewhat - a dealer IS under an obligation to not do something that would harm my car. There is no statutory basis for this, but they were negligent, at a minimum. If they knowingly put the wrong fluid in my car then they should ether 1) bear the responsibility for any resulting problems or 2) have me sign a waiver.
When I asked "Can you replace the transmission fluid with synthetics?" the service manager said "Sure." That implied that it was acceptable to Mazda to do put synthetics in an 89 convertible.
He tried to argue that he just did what I asked and, as a result, the dealership was not responsible. This is absurd. What he really was trying to do was cover his ***. He said OK to something he didn't have a clue about and then, when a problem resulted, he tried unsuccessfully to justify his ignorance.
The bottom line is that it doesn't really matter what legal consequences there could be. Laws set the minimum standard of permissible conduct. I expect anyone performing a service for me to act well above this minimum standard. This dealer was not up to par.
Dave
As an attorney, I disagree somewhat - a dealer IS under an obligation to not do something that would harm my car. There is no statutory basis for this, but they were negligent, at a minimum. If they knowingly put the wrong fluid in my car then they should ether 1) bear the responsibility for any resulting problems or 2) have me sign a waiver.
When I asked "Can you replace the transmission fluid with synthetics?" the service manager said "Sure." That implied that it was acceptable to Mazda to do put synthetics in an 89 convertible.
He tried to argue that he just did what I asked and, as a result, the dealership was not responsible. This is absurd. What he really was trying to do was cover his ***. He said OK to something he didn't have a clue about and then, when a problem resulted, he tried unsuccessfully to justify his ignorance.
The bottom line is that it doesn't really matter what legal consequences there could be. Laws set the minimum standard of permissible conduct. I expect anyone performing a service for me to act well above this minimum standard. This dealer was not up to par.
Dave
On a long vacation
Joined: Feb 2001
Posts: 2,160
Likes: 0
From: Bay Area, CA, U.S.A.
Originally posted by NJDave
I use Redline in both my transmission (MT-90) and the differential (75W90 Gear oil). Someone above mentioned Mobil 1. Unless Mobil 1 makes a gear oil I don't know about (could be possible) I wouldn't use it. I took my very low mileage 89 RX-7 convertible to the dealer and asked them to put synthetic oil in. They did it and just put Mobil 1 oil in. I noticed my gears started grinding almost immediately, mainly from first to second gear. I can't remember the exact details, but I did some checking and determined that Mobil 1 isn't the best oil for the trans - if I remember correctly, Mobil 1 is a GL-5 oil and the recommendation for the transmission is GL-4.
I use Redline in both my transmission (MT-90) and the differential (75W90 Gear oil). Someone above mentioned Mobil 1. Unless Mobil 1 makes a gear oil I don't know about (could be possible) I wouldn't use it. I took my very low mileage 89 RX-7 convertible to the dealer and asked them to put synthetic oil in. They did it and just put Mobil 1 oil in. I noticed my gears started grinding almost immediately, mainly from first to second gear. I can't remember the exact details, but I did some checking and determined that Mobil 1 isn't the best oil for the trans - if I remember correctly, Mobil 1 is a GL-5 oil and the recommendation for the transmission is GL-4.
Thats not an FC...
Joined: Apr 2001
Posts: 844
Likes: 0
From: spring hill, Fla
one time, i heard straight 30 weight oil was good for a tranny... i forget which tranny that is.
Gene, calm down. just cuz you heard/read "Mobil 1" in a thread doesnt mean they are puttin 10w30 in their tranny. mobil one is just the synthetic line. ease up cheif.
Gene, calm down. just cuz you heard/read "Mobil 1" in a thread doesnt mean they are puttin 10w30 in their tranny. mobil one is just the synthetic line. ease up cheif.
Cheese
Joined: May 2001
Posts: 452
Likes: 0
From: Australia
REDLINE MTL or MT90 is specially formulated synthetic and actually works wonders in trannies. The oil has a viscosity of 10-30 or 10-40 depending on which one you need, and high a HIGH COEFFICIENT OF FRICTION (same as 70 weight motor oil) which is what you need for burnt/bad/worn synchros. The high friction will allow synchros to sync much faster than any other oil, eliminating grinding and hard shifting.
wouldn't 10-30/10-40 be way too viscous? or should i be using 75w-90 for my trans?
cheers
B
sold--no longer in debt
Joined: Dec 2002
Posts: 1,659
Likes: 11
From: Cleveland, Ohio
I had a 2nd gear grind.. bad. couldn't shift above 2k without a nasty grind or thud... couldnt even think about downshifting.
put the redline in.. and it hasnt ground yet (well once on a downshift because i was between 2nd and 4th)
and i havent tried shifting above 4k rpm yet because.. i havent gone past 4k (new rebuilt motor)
put the redline in.. and it hasnt ground yet (well once on a downshift because i was between 2nd and 4th)
and i havent tried shifting above 4k rpm yet because.. i havent gone past 4k (new rebuilt motor)
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