Front, rear differential and transfer case fluid

[dcjeeper]

Hi, my 2016 SR5 is due for differential and transfer case fluid change. I did it before with Mobil1 75w-90 LS from Advance Auto Advance Auto Parts - Down for Maintenance

I also have some Liquid Moly GL4/5 75W90 Fully Synthetic Hypoid Gear Oil (1 Liter) - Liqui Moly LM22090 from FCP Euro Just a moment... that were left over when I did my German cars.

The Mobil on has a "L/S" meaning "limited slip", while the Liquid Molly doesn't but is labeled as "hypoid".

I looked at the Beginner's Maintenance post and noticed that the OEM for front and rear is Toyota Genuine Differential Gear Oil LT 75W-85 GL-5: Toyota part #: 0888502506, and the transfer case is Toyota SAE LF 75W: Toyota part #: 0888581080. I changed all with Mobil 1 75w-90 LS twice before and didn't notice any issues yet, wonder if this time I could use the same Mobil1 one LS or Liquid Moly, or should I stick to the OEM or Red Line recommended in the post?

 

[CutthroatSlam]

Use 75w90 synthetic LS in front and rear differentials. Use non-LS synthetic 75w90 in the transfer case. Mobil Delvac is a good choice for non-LS 75w90.

 

[Hungryhawk]

GL-4 gear oil for transfer case. A few brands make Toyota spec gear lube. Supposidly GL-5 gear lube has ingredients that can negatively impact components in the TC. I read something about synchros? So using same lube for all 3 probably not best.
For diffs, 75/85 or 75/90 probably not a big deal except maybe in cold winter weather?
There are moving components in front diff even when in 2WD. Something about diff spyders and the ADD system? So doing both on same schedule is smart.

 

[Bmnorm2]

Hi, my 2016 SR5 is due for differential and transfer case fluid change. I did it before with Mobil1 75w-90 LS from Advance Auto Advance Auto Parts - Down for Maintenance

I also have some Liquid Moly GL4/5 75W90 Fully Synthetic Hypoid Gear Oil (1 Liter) - Liqui Moly LM22090 from FCP Euro Just a moment... that were left over when I did my German cars.

The Mobil on has a "L/S" meaning "limited slip", while the Liquid Molly doesn't but is labeled as "hypoid".

I looked at the Beginner's Maintenance post and noticed that the OEM for front and rear is Toyota Genuine Differential Gear Oil LT 75W-85 GL-5: Toyota part #: 0888502506, and the transfer case is Toyota SAE LF 75W: Toyota part #: 0888581080. I changed all with Mobil 1 75w-90 LS twice before and didn't notice any issues yet, wonder if this time I could use the same Mobil1 one LS or Liquid Moly, or should I stick to the OEM or Red Line recommended in the post?

Limited Slip additives in a non limited slip differential is fine. The opposite is not!

 

[CutthroatSlam]

75W90 is fine during winter. The first # is the viscosity rating when cold and it’s the same rating as the straight 75W that Toyota recommends.

 

[gordonp]

^^^^

This.

75W-anything will meet Toyota's general requirement.

I tow 5,000lbs in the Rocky Mountains sometimes, and I'm happy with 75W-140 synthetic (along with a whopping-huge 22,000 GVW tranny cooler ).

Thinking back over the past ~40 years, whenever I change T-Case oil, it looks pristine. So, use what you're comfortable with, and so long as the oil begins with "75W-" you should be happy. I'm happy.

(Aside: I owned a LandCruiser FJ45 with DIY dual-tcase setup, using NP203-reduction and NP205. These were the only t-cases that called for ATF, and again - always looked pristine when changed. All others - Subaru, XTerra, 3x Suzuki, 4Runner - 75W140 and never a problem. When it's cold out, they ALL flow like 75W. Under stress, that's where the "-140" separates the boys from the men).