01 Toyota tacoma 4x4 gear oil GL-5 80w90 vs 75w90

[bigsteve]

PP–90
PREPARATION – SUSPENSION AND AXLE
Author: Date: 141
2003 TOYOTA TACOMA (RM1002U)
LUBRICANT
Item Capacity Application

Front differential
Differential oil
Hypoid gear oil API GL–5
SAE 75W–90
Rear differential

Hypoid gear oil API GL–5 SAE 75W–90
Above –18°C (0°F) SAE 90
Below –18 °C (0 °F) SAE 80W or 80W–90
Why would they list 80w90 gear oil for colder weather than 745w90? This is for a toyota tacoma 4x4 2001 pick up. Why do they list the straight weight oils?

 

[ARB1977]

75W90 and call it a day.

 

[Johnny]

Originally Posted By: bigsteve
PP–90
PREPARATION – SUSPENSION AND AXLE
Author: Date: 141
2003 TOYOTA TACOMA (RM1002U)
LUBRICANT
Item Capacity Application

Front differential
Differential oil
Hypoid gear oil API GL–5
SAE 75W–90
Rear differential

Hypoid gear oil API GL–5 SAE 75W–90
Above –18°C (0°F) SAE 90
Below –18 °C (0 °F) SAE 80W or 80W–90
Why would they list 80w90 gear oil for colder weather than 745w90? This is for a toyota tacoma 4x4 2001 pick up. Why do they list the straight weight oils?

to BITOG

Agree use 75W-90 gear oil.

Owners manuals are very confusing sometimes. Most 75W-90 gear oils are synthetic and most straight weights and 80W-90 gear oils are mineral based. What they are trying to tell you is if the temps are above 0-F you can use a straight 90wt gear oil, but if you are going to see temps below 0-F to use a 80W-90 mineral gear oil. Your 75W-90 gear oils will cover a wider temp range, and will work a lot better in below 0 temps.

A good gear oil to use that you can probably find on the parts shelf of most parts stores in your area would be Mobil 1 75W-90 gear oil. You do not have to add anything to it in case you have a limited slip/posi-track diff.

 

[bigsteve]

Isn't it kinda strange to see a toyota recommending a straight weight oil these days?

Also have any of you ysed a lube called Fluid Film?

 

[wantin150]

FWIW, the 2008 Scion xD I have (Toyota w/ different name) recommends 75W for the manual tranny. No 75Wxx, just 75W.

Look into the Amsoil SVG 75W90 or their 75W110.

 

[bigsteve]

I thought that straigt weight oils went away in the 60s or 70s for the newer multi weight gear oils like 80w90? Does toyota know something about single weight gear oils that we don't?

 

[INDYMAC]

Originally Posted By: bigsteve
I thought that straigt weight oils went away in the 60s or 70s for the newer multi weight gear oils like 80w90? Does toyota know something about single weight gear oils that we don't?


I have a 2000 Tundra and 2004 S2000 that recommend SAE 90 GL5 in the rear differential (80W-90 if below 0F in the Tundra). The Tundra recommends only 75W-90 in the front diff and T-case. My take on why this is is purely speculative. To my knowledge, excessive heat and extreme pressures are the mortal enemies of the rear differential. The front diff is for situational/emergency use only, and instant complete lubrication would be the highest priority requirement of the gear oil. Why SAE 90 in the rear, because it stays in grade better than multi-vis for the long haul (the UOA's I've seen seem to comfirm this). Why multi-vis 75W-90 in the front and T-case? Because staying in grade is not critical for their use.

 

[Ken2]

Originally Posted By: bigsteve
Also have any of you used a lube called Fluid Film?
I've used Eureka Fluid Film. It is a rust preventive coating with some lubricating qualities. It is not a gear oil. It isn't even the best rust preventive I've used.
http://www.eurekafluidfilm.com/applications/automotive.html

 

[Ken2]

Originally Posted By: INDYMAC
Originally Posted By: bigsteve
I thought that straigt weight oils went away in the 60s or 70s for the newer multi weight gear oils like 80w90? Does toyota know something about single weight gear oils that we don't?


I have a 2000 Tundra and 2004 S2000 that recommend SAE 90 GL5 in the rear differential (80W-90 if below 0F in the Tundra). The Tundra recommends only 75W-90 in the front diff and T-case. My take on why this is is purely speculative. To my knowledge, excessive heat and extreme pressures are the mortal enemies of the rear differential. The front diff is for situational/emergency use only, and instant complete lubrication would be the highest priority requirement of the gear oil. Why SAE 90 in the rear, because it stays in grade better than multi-vis for the long haul (the UOA's I've seen seem to comfirm this). Why multi-vis 75W-90 in the front and T-case? Because staying in grade is not critical for their use.
I use 75W-90 gear oil in my '01 Tundra, and when I disassembled the differential to install a limited slip unit, the gear tooth contact areas were beautiful...perfect contact with exactly the wear pattern we'd hope for. I've done a lot of towing with this truck at about 90% of max combined weight rating. I do not know why Toyota recommends 80W-90 or 90 wt. in these rear differentials.

 

[bigsteve]

I just changed the rear axel gear oil only to 80w90, should I cahange it out ot 80w or 90w straight gear oil? I live in massachusetts and it gets pretty cold in the winter.

 

[Johnny]

What brand 80W-90 did you use?

 

[bigsteve]

thanks, I know its not a gear lube I was just asking if anyone had used it.

 

[bigsteve]

Castrol conventional gear oil I had read it was very good. I have Valvoline 75w90 gear oil conventional for the front differential and transfer case because thats the only dino gear oil I can find in 75w90, thats what toyota recommends for those two. The only 90w gear oil I have found is on the web LE 607 qt for 12.50 ea

 

[bigsteve]

Also when the truck is not in 4x4 does anything in the front axel require gear oil to lube it?

 

[bigsteve]

Can anyone tell me if Castrol 80w-90 conventional gear oilo is a good choice?