Accidentally had a shop put in 75w140 for the MT fluid... - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Aztec · 07-15-2015, 01:53 AM

As the title says, put a much thicker gear oil than most people use. My question is, is it worth buying a better thinner oil and swapping it.

Is there any ill effects that could hurt the tranny?
I've heard mixed things, but pennzoil 75w90 and eneos 75w90 seem to be some of the highest rated gear oils for the trans

Thanks ahead of time

swarb · 07-15-2015, 02:12 AM

I don't know. Is your transmission worth it? Why not put corn oil in the engine? oil is oil right? Leave it in there and find out.

Decay107 · 07-15-2015, 02:43 AM

Is your car a purpose built racecar that sees elevated temperatures constantly and eats transmissions as a consumable?

No?

You should probably go to a thinner oil, as I doubt your bearings and gears are happy with something that thick.

Edit: Also make sure its not a GL-5!!!!!

humfrz · 07-15-2015, 02:50 AM

Quote:

Originally Posted by Decay107

Is your car a purpose built racecar that sees elevated temperatures constantly and eats transmissions as a consumable?

No?

You should probably go to a thinner oil, as I doubt your bearings and gears are happy with something that thick.

I'll second that .......

humfrz

Decay107 · 07-15-2015, 02:54 AM

I'll just add in again so it cannot possibly be missed.

Make sure that oil is not a GL5 or you'll be fighting a corrosion problem on top of a lubrication problem!

Ultramaroon · 07-15-2015, 03:18 AM

Quote:

Originally Posted by Decay107

Edit: Also make sure its not a GL-5!!!!!

Quote:

Originally Posted by Decay107

I'll just add in again so it cannot possibly be missed.

Make sure that oil is not a GL5 or you'll be fighting a corrosion problem on top of a lubrication problem!

^^By far the most important point in this thread.^^

Aztec · 07-15-2015, 04:11 AM

Quote:

Originally Posted by Decay107

Is your car a purpose built racecar that sees elevated temperatures constantly and eats transmissions as a consumable?

No?

You should probably go to a thinner oil, as I doubt your bearings and gears are happy with something that thick.

Edit: Also make sure its not a GL-5!!!!!

Thank you gents, I'll be swapping out the trans fluid tomorrow. Luckily it hasn't been more than day so no real damage has been done.

AZP Installs · 07-15-2015, 08:14 AM

I would consider switching over to Motul Gear 300 75w90. We've had great success with this fluid in 100s of customer cars over the years. This fluid gives you very smooth engagement coupled with full synthetic protection. Our Project BRZ which is a track and street car as well as our Spec86 Cup wheel to wheel race car get this in both the transmission and rear differential.

We never suggest anything that we don't use in our own vehicles and haven't tested ourselves.

You can purchase (4) Liters for $85 shipped through us as well. http://store.azpparts.com/fluids/motul-gear-300-75w90/

-mike

07-15-2015, 01:53 AM	#1
Aztec Lost in the twisties Join Date: Sep 2014 Drives: 2014 BRZ Dark Gray Metallic Location: Beaverton, OR Posts: 662 Thanks: 439 Thanked 298 Times in 188 Posts Mentioned: 33 Post(s) Tagged: 2 Thread(s)	Accidentally had a shop put in 75w140 for the MT fluid... As the title says, put a much thicker gear oil than most people use. My question is, is it worth buying a better thinner oil and swapping it. Is there any ill effects that could hurt the tranny? I've heard mixed things, but pennzoil 75w90 and eneos 75w90 seem to be some of the highest rated gear oils for the trans Thanks ahead of time __________________ NEW CAR!🚨🏎️⛽ 2014 BRZ: Edelbrock SC, CSG ZachTune, Jackson Radiator/Oil cooler, lightweight flywheel, CNT UEL, Berk OP/FP, Ark Grip Catback, Carbon fiber Driveshaft Aztec's Build Thread

07-15-2015, 02:43 AM	#3
Decay107 Turning is for Nerds Join Date: Aug 2013 Drives: 35 characters is not enough Location: PDX Posts: 1,974 Thanks: 836 Thanked 1,259 Times in 717 Posts Mentioned: 186 Post(s) Tagged: 3 Thread(s)	Is your car a purpose built racecar that sees elevated temperatures constantly and eats transmissions as a consumable? No? You should probably go to a thinner oil, as I doubt your bearings and gears are happy with something that thick. Edit: Also make sure its not a GL-5!!!!! __________________ My build thread / journal / evidence for warranty claim denial Motorcycle build thread

07-15-2015, 02:54 AM	#5
Decay107 Turning is for Nerds Join Date: Aug 2013 Drives: 35 characters is not enough Location: PDX Posts: 1,974 Thanks: 836 Thanked 1,259 Times in 717 Posts Mentioned: 186 Post(s) Tagged: 3 Thread(s)	I'll just add in again so it cannot possibly be missed. Make sure that oil is not a GL5 or you'll be fighting a corrosion problem on top of a lubrication problem! __________________ My build thread / journal / evidence for warranty claim denial Motorcycle build thread

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07-15-2015, 02:12 AM	#2
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,052 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	I don't know. Is your transmission worth it? Why not put corn oil in the engine? oil is oil right? Leave it in there and find out.

07-15-2015, 08:14 AM	#8
AZP Installs Join Date: Oct 2011 Drives: '11 STi->'14 BRZ \| '14 Touareg TDi Location: Kenilworth, NJ Posts: 1,269 Thanks: 359 Thanked 558 Times in 371 Posts Mentioned: 49 Post(s) Tagged: 0 Thread(s)	I would consider switching over to Motul Gear 300 75w90. We've had great success with this fluid in 100s of customer cars over the years. This fluid gives you very smooth engagement coupled with full synthetic protection. Our Project BRZ which is a track and street car as well as our Spec86 Cup wheel to wheel race car get this in both the transmission and rear differential. We never suggest anything that we don't use in our own vehicles and haven't tested ourselves. You can purchase (4) Liters for $85 shipped through us as well. http://store.azpparts.com/fluids/motul-gear-300-75w90/ -mike

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