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View Poll Results: What brand of transmission and resr end fluid for your 1LE
Redline 15 32.61%
Royal Purple 7 15.22%
MTL 2 4.35%
OEM 12 26.09%
Something else 10 21.74%
Voters: 46. You may not vote on this poll

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Old 02-26-2015, 04:33 PM   #1
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Transmission Fluid & Gear Lube - What is best for the 1LE ?

So I'm buying some new transmission fluid and gear oil this weekend for my 1LE. Hopeing to get rid of the famous notchy 1-2 shift and have some new rear end fluid for the upcoming summer season
I've been reading about the many different ideas and opinions of which is best brand too use.

I'm leaning towards the Redline brand but the Royal Purple and MTL seem to be probably just as popular.
The car use is basically street with the odd "spirited" run on the highway. Not likely to see track use. Only driven in the summer.

What is everyone here using, brand and weight for trans/rear end ??
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Old 02-26-2015, 04:36 PM   #2
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Redline .
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Old 02-26-2015, 04:50 PM   #3
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From my build thread:
Quote:
[*]Fluids
  • Engine oil: Mobil1 0W-40.
  • Differential oil: Amsoil 75W-110 (no additive required).
  • Transmission oil: Amsoil Signature Series Multi-Vehicle Synthetic ATF.
  • Brake fluid: Motul RBF 600.
  • Coolant: GM DexCool @50%.
  • Suspension grease: Amsoil Synthetic Polymeric Truck, Chassis and Equipment Grease, NLGI #2.
I honestly used to not like Amsoil due to their aggressive marketing in the forums (though not really present in this forum), but their products are good.

One important note about diff fluid:
The factory spec is 75W-90, which is a very old and wide spec, allowing a huge variation between fluids of the same spec. 75W-110 was created later to address this, which is actually within specs of 75W-90 (so you can use it anywhere that requires 75W-90), yet performs much better at higher temps. An inadequate fluid will quickly render your rear diff "open" at the track when it starts to overheat. I would actually even recommend using 75W-140 for track duty, but it would be too thick for daily driving purposes.

To my surprise, 75W-110 also did not need any additive (friction modifier) to work on our cars. As you know, the additive also decreases the usefullness of the limited slip differential.
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Old 02-26-2015, 04:57 PM   #4
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Originally Posted by GONIF View Post
Redline .
+2: D4 ATF for the trans=WOW and 75W90 for the rear with the additive already added=no issues
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Old 02-26-2015, 06:11 PM   #5
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Redline now has 75w110 gear lube, # 57804, for LS rears. I just bought some.
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Old 02-26-2015, 06:40 PM   #6
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D4 is great for street cars. I didn't notice much difference in shift feel switching from OEM to Redline D4. Maybe a little better when it's cold, but I don't drive it much in the cold. This season I think I'm going to try the MTL. It's a little heavier in weight which should fair well on track. It's been noted to have good synchro spin up and protection.
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Old 02-26-2015, 08:41 PM   #7
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Quote:
Originally Posted by X25 View Post
From my build thread:


I honestly used to not like Amsoil due to their aggressive marketing in the forums (though not really present in this forum), but their products are good.

One important note about diff fluid:
The factory spec is 75W-90, which is a very old and wide spec, allowing a huge variation between fluids of the same spec. 75W-110 was created later to address this, which is actually within specs of 75W-90 (so you can use it anywhere that requires 75W-90), yet performs much better at higher temps. An inadequate fluid will quickly render your rear diff "open" at the track when it starts to overheat. I would actually even recommend using 75W-140 for track duty, but it would be too thick for daily driving purposes.

To my surprise, 75W-110 also did not need any additive (friction modifier) to work on our cars. As you know, the additive also decreases the usefullness of the limited slip differential.
Yeah, I put the additive in with Amsoil 75w-90 Severe Gear and there is so much slip the rear diff is essentially open now. Next time no additive.
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Old 02-27-2015, 10:05 AM   #8
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So 75w-110 is the best for the rear end it seems.
Stay away from additives ??

Still undecided on the transmission but leaning to the Redline D4.

Come on guys, need some input LOL
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Old 02-27-2015, 10:18 AM   #9
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Quote:
Originally Posted by X25 View Post
From my build thread:


I honestly used to not like Amsoil due to their aggressive marketing in the forums (though not really present in this forum), but their products are good.

One important note about diff fluid:
The factory spec is 75W-90, which is a very old and wide spec, allowing a huge variation between fluids of the same spec. 75W-110 was created later to address this, which is actually within specs of 75W-90 (so you can use it anywhere that requires 75W-90), yet performs much better at higher temps. An inadequate fluid will quickly render your rear diff "open" at the track when it starts to overheat. I would actually even recommend using 75W-140 for track duty, but it would be too thick for daily driving purposes.

To my surprise, 75W-110 also did not need any additive (friction modifier) to work on our cars. As you know, the additive also decreases the usefullness of the limited slip differential.
Thanks a lot for this X25!
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Old 02-27-2015, 10:40 AM   #10
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+1 for Redline D4 - heard nothing but good things.

Let me know if you find D4 cheaper in the GTA, rather than off amazon.
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Old 02-27-2015, 11:19 AM   #11
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Who voted MTL? Thoughts? Opinions?
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Old 02-27-2015, 12:49 PM   #12
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Quote:
Originally Posted by ST1LE View Post
Thanks a lot for this X25!
My pleasure!
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Old 02-27-2015, 01:32 PM   #13
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Quote:
Originally Posted by White_SS/RS View Post
Who voted MTL? Thoughts? Opinions?
I did. There is a bunch of "internet knowledge" out there about not using anything thicker than ATF (such as D4), but I don't believe it.

I did a bunch of research on it, and the bottom line for me:
  • 100% MTL would be preferred for me if I tracked the car under warm weather conditions.
  • For warm weather and street use only, I would use a 50/50 mix of MTL and D4 (which I am using now, since my car is stored during the winter and never tracked);
  • And for winter driving, I would use straight D4.
I'm confident enough in MTL that I am partial to using it 100% for warm weather only, even if not tracked. But, haven't made that leap yet.

See my thoughts/research here:


http://www.camaro5.com/forums/showthread.php?t=374798
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Old 02-27-2015, 02:18 PM   #14
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I'm with X25 on this. My cases of Amsoil shoud be delivered on Monday and now can't wait for the weather to warm up. Going with the full run of Amsoil front to back including the brake fluid. Did go with the 75w-140 for the rear as the car will spend most of it's time on a track in one form or another. Will be doing a post on all the fluids once the season gets underway and offer opinions and results. Hoping for good things for sure and will keep it updated.
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Old 02-27-2015, 02:24 PM   #15
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Quote:
Originally Posted by jksynergy View Post
I'm with X25 on this. My cases of Amsoil shoud be delivered on Monday and now can't wait for the weather to warm up. Going with the full run of Amsoil front to back including the brake fluid. Did go with the 75w-140 for the rear as the car will spend most of it's time on a track in one form or another. Will be doing a post on all the fluids once the season gets underway and offer opinions and results. Hoping for good things for sure and will keep it updated.
It will likely be very hard to compare before/after performance since it is very hard to know what is exactly causing traction issues at the track during the sessions (overheated tire? differential giving up? driver thirsty?); good luck!

With -140 oil, diff might also run a little bit hotter ironically due to diff being more operational during the whole session (and having more friction during operation), but I am honestly not sure what would be the impact on overall temps. The thicker oil might also help take heat away from the clutches. That diff cooler kit (from Z/28) comes to mind as an excellent companion : )
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Old 02-27-2015, 02:34 PM   #16
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Quote:
Originally Posted by Camarotobeornottobe View Post
I did. There is a bunch of "internet knowledge" out there about not using anything thicker than ATF (such as D4), but I don't believe it.

I did a bunch of research on it, and the bottom line for me:
  • 100% MTL would be preferred for me if I tracked the car under warm weather conditions.
  • For warm weather and street use only, I would use a 50/50 mix of MTL and D4 (which I am using now, since my car is stored during the winter and never tracked);
  • And for winter driving, I would use straight D4.
I'm confident enough in MTL that I am partial to using it 100% for warm weather only, even if not tracked. But, haven't made that leap yet.

See my thoughts/research here:


http://www.camaro5.com/forums/showthread.php?t=374798
I remember the tread, you collected a lot of good info and was one of the reasons I started looking into it.
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Old 02-27-2015, 09:00 PM   #17
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Quote:
I'm with X25 on this. My cases of Amsoil shoud be delivered on Monday and now can't wait for the weather to warm up. Going with the full run of Amsoil front to back including the brake fluid.
FYI I boiled their 600 on the track TWICE and I flush/fill with new, every time I go...
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Old 02-27-2015, 09:57 PM   #18
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I've been happy with Motul RBF600. If I run into issues, instead of switching to SRF, I'd try to upgrade the brakes and cooling first, since fluid is not the only component badly impacted by very high temps in the brake system.
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Old 02-27-2015, 10:14 PM   #19
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I boiled the motul too.......putting cooling ducts and castrol in this weekend. Interesting enough X25, I have decided I like the 4 piston setup with aggressive carbotech's over the 6 piston zl1( with eagle f1's on the car) setup. They do generate a lot more heat though...
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Old 02-27-2015, 10:19 PM   #20
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I accidentally voted MTL slip of the finger really, , so please subtract 1 from it, because I really wanted to vote Redline, thinking MTL was an other brand or something, (mind you, I do plan on using a lil' Redline MTL in my tranny), but then I was like wait! He really did mean "Redline" MTL, but then realized who in their right mind would use Redline MTL in their diff ???

Sledge and I disqualify this pole!!!
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Old 02-27-2015, 10:24 PM   #21
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Quote:
Originally Posted by Camarotobeornottobe View Post
I did. There is a bunch of "internet knowledge" out there about not using anything thicker than ATF (such as D4), but I don't believe it.

I did a bunch of research on it, and the bottom line for me:
  • 100% MTL would be preferred for me if I tracked the car under warm weather conditions.
  • For warm weather and street use only, I would use a 50/50 mix of MTL and D4 (which I am using now, since my car is stored during the winter and never tracked);
  • And for winter driving, I would use straight D4.
I'm confident enough in MTL that I am partial to using it 100% for warm weather only, even if not tracked. But, haven't made that leap yet.

See my thoughts/research here:


http://www.camaro5.com/forums/showthread.php?t=374798
I'm with you, and I'll be posting up my MTL/D4 observations the 1st week I take Sledge out from winter hibernation.

This ride never sees winter or rain for that matter, and when its driven, it's driven hard, so it almost makes no sense at all, for me to be using 100% D4.
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Old 02-27-2015, 10:45 PM   #22
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Redline makes a fantastic product. I have been using it for over 20 years in various vehicles/boats with great success. I would recommend that you switch to their 5W40 motor oil. Servicing all the fluids will ensure a long life for your Camaro.
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Old 02-28-2015, 12:39 PM   #23
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When I purchased my TKO Tremec's for projects I alway used GM Syncromesh from the dealer, it ain't cheap, but I never had the knotchy feelings other people always felt.

For the rear I have always used the royal purple
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Old 02-28-2015, 12:46 PM   #24
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Old 02-28-2015, 02:50 PM   #25
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Quote:
Originally Posted by backeddy View Post
I boiled the motul too.......putting cooling ducts and castrol in this weekend. Interesting enough X25, I have decided I like the 4 piston setup with aggressive carbotech's over the 6 piston zl1( with eagle f1's on the car) setup. They do generate a lot more heat though...
I know this is a little off topic from what the OP's question is but it is an interesting conclusion on your brake set up. Can you elaborate more on why you like the 4 piston set up better? Is it due to the increased weight of the 6 piston set up?

I would think that the 6 piston set up with the same carbotech pads would be even more aggressive than the 4 piston set up due to the increased pad size.
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