Amsoil:75W90 or 80W90? Experiences?
#1
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Join Date: Oct 2009
Location: Ottawa, ON, Canada
Posts: 107
Total Cats: 5
Amsoil:75W90 or 80W90? Experiences?
Time to switch-out fluids and I'm considering Amsoil products based on the fact that the I started using Rotella T6 based on recommendations here and it's awesome.
Amsoil shows the following for the MSM transmission (not sure if items are listed in order of their recommendation/performance):
I've seen recommendations for the GL-4 75W90, but no discussion on the GL-5 80W90. Any experience with it, or technical reasons for not using it? Mazda spec says GL-4 or GL-5 are OK. Any reason to avoid the GL-5?
For the diff, Amsoil shows:
Again, seen recommendations for the SEVERE GEAR, but not discussion of using the 80W90. Any reasons why?
I have to admit, it would be nice to run the same fluid (80W90) in both locations.
Experience, recommendations, thoughts?
Thx.
Amsoil shows the following for the MSM transmission (not sure if items are listed in order of their recommendation/performance):
Manual Transmission,N/A (6-SPD)......GL-5
Above 50 F......80W-90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
Manual Transmission,N/A (6-SPD)......GL-4
Above 50 F......80W-90
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)
Above 50 F......80W-90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
Manual Transmission,N/A (6-SPD)......GL-4
Above 50 F......80W-90
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)
I've seen recommendations for the GL-4 75W90, but no discussion on the GL-5 80W90. Any experience with it, or technical reasons for not using it? Mazda spec says GL-4 or GL-5 are OK. Any reason to avoid the GL-5?
For the diff, Amsoil shows:
Differential, Rear......GL-5
All TEMPS......90
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
SAE 80W-90 Synthetic Gear Lube (AGLQT)
All TEMPS......90
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
SAE 80W-90 Synthetic Gear Lube (AGLQT)
I have to admit, it would be nice to run the same fluid (80W90) in both locations.
Experience, recommendations, thoughts?
Thx.
#3
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Location: Kingston, Ontario
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I used 75w90 in my Miata trans. it worked really well as far as gear oil goes.
Its not a "quiet" oil by any means, but the gears shifted well. I should mention that the noise could have been the 7lb flywheel and solid hub clutch resonating through the transmission too... just a lot of buzzing from the shifter at high RPM, but again the shifter worked wayyyy better than the oil that was in there... I think it was motomaster 75-90.
I also used a weird 75-90 and sae250 mixture for my diff being that I had a custom build OS Giken. That diff was SO quiet. Would use amsoil on everything again.
You can get a preferred customer card and buy direct on their website. Much cheaper than Canadian tire, but it will take a few days to come from their warehouse in Toronto. The customer card makes sense being that its like $6 or something and will save you more than that on your first purchase.
Its not a "quiet" oil by any means, but the gears shifted well. I should mention that the noise could have been the 7lb flywheel and solid hub clutch resonating through the transmission too... just a lot of buzzing from the shifter at high RPM, but again the shifter worked wayyyy better than the oil that was in there... I think it was motomaster 75-90.
I also used a weird 75-90 and sae250 mixture for my diff being that I had a custom build OS Giken. That diff was SO quiet. Would use amsoil on everything again.
You can get a preferred customer card and buy direct on their website. Much cheaper than Canadian tire, but it will take a few days to come from their warehouse in Toronto. The customer card makes sense being that its like $6 or something and will save you more than that on your first purchase.
#8
Junior Member
Thread Starter
Join Date: Oct 2009
Location: Ottawa, ON, Canada
Posts: 107
Total Cats: 5
Found the threads you guys mentioned.
Conclusions:
- Everyone likes Amsoil MTG 75W90; Emilio likes it with some GM Friction Mod added-in
- Motorcraft Full Synth is well regarded with 6-speed (what I've been using), but no UOA data
- With respect to shifting feel, there has been direct comparo between MTG and Motorcraft.
- Hustler is on a crusade to ensure no one puts GL-5 in their gearbox despite the fact that the Mazda manuals say GL-5 is OK for my gearbox (2004 MSM)
- no one has tried the 80W90, which is GL-5
Did I miss anything?
Conclusions:
- Everyone likes Amsoil MTG 75W90; Emilio likes it with some GM Friction Mod added-in
- Motorcraft Full Synth is well regarded with 6-speed (what I've been using), but no UOA data
- With respect to shifting feel, there has been direct comparo between MTG and Motorcraft.
- Hustler is on a crusade to ensure no one puts GL-5 in their gearbox despite the fact that the Mazda manuals say GL-5 is OK for my gearbox (2004 MSM)
- no one has tried the 80W90, which is GL-5
Did I miss anything?
#9
I put MTG 75w90 in our MSM and it was the the ****, the bee's knees, solved world cancer, cured my IBS, and any other awesome thing you can possibly think of.
As an Amsoil dealer myself, i'm directly responsible for at least 100 Miata transmissions being filled with the MTG 75w90 at this point. Done 6 myself. 3 of which were replacing garbage Redline bullshit and every last one i replaced Redline with Amsoil resulted in the car's owner offering me fellatio.
As an Amsoil dealer myself, i'm directly responsible for at least 100 Miata transmissions being filled with the MTG 75w90 at this point. Done 6 myself. 3 of which were replacing garbage Redline bullshit and every last one i replaced Redline with Amsoil resulted in the car's owner offering me fellatio.
#15
Isn't GL-5 not recommended for the Aisin 6-speeds because of yellow metal synchros being damaged by the sulfur additives in GL-5? At least that's why it's not recommended for the 5-speeds. Diff don't care.
Redline Heavy Shockproof is not recommended for any transmissions other than straight cut dog boxes. Their website says no synchro trannies. The stuff is basically a liquid carrier for the lubricating solids.
Redline Heavy Shockproof is not recommended for any transmissions other than straight cut dog boxes. Their website says no synchro trannies. The stuff is basically a liquid carrier for the lubricating solids.
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