Differential fluid?

2020 TOYOTA TACOMA
120 MILES • 2.7L • AUTOMATIC
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FLOATR925
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Which type is best for my rear differential .I see different types Hyp ..I can't pronounce it ..type, an the synthetic type like redline an mobile 1 .I know the actual toyota ..dealer differential fluid is like 50 bucks a quart too .mobil 1 is 20. .I would like to get the proper type without busting the wallet .I think it takes a little over 3 quarts ..
Thanks
Aug 5, 2026 at 6:39 PM
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FLOATR925
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Hypoid Gear Oil LT 75W-85 GL-5 ..what I found ..
Though I see mostly synthetic 75w 90 ..
Aug 5, 2026 at 6:44 PM
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JACOBANDNICKOLAS
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Hi:

The best would be exactly what the manufacturer recommends. I checked all model Tacoma trucks, and they all call for exactly what you said: LT75W-85 GL5. See pics below.

Certainly, a synthetic fluid will not hurt anything, but I do suggest going with the recommended weight.

Let me know if you have other questions.

Take care,

Joe

See pic below
Aug 5, 2026 at 8:04 PM
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FLOATR925
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Thanks..but whick type - ..synthetic or Hypoid? I see mobil 1 synthetic says 75 w 90 ..is thay ok vs recommended 75 w 85
Aug 6, 2026 at 6:16 AM
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FLOATR925
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I see redline has the Hypoid synthetic ..an Mobil 1 is just synthetic ..would redline be more better
Aug 6, 2026 at 6:24 AM
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JACOBANDNICKOLAS
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Hi:

Redline is a good product. However, your vehicle doesn't require hypoid oil. Hypoid gear oil is a specialized lubricant designed for gear shafts that don’t traditionally intersect, creating a combination of rolling and sliding contact. Regular gear oils can’t handle that type of abuse.

Your differential doesn't require it. It does require an LT-rated oil that is offered by Redline. Toyota's oil is a synthetic with a limited-slip additive in it.

Take a look through this link. I think it will help explain it to you better than I'm doing. LOL I try.

https://carspecmn.com/toyota-and-lexus-lx-lt-lf-and-ll80-specialized-transfer-case-and-differential-fluids/

Take care,

Joe
Aug 6, 2026 at 8:13 PM
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FLOATR925
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Is this ok ..I ordered it
That redline ~


Gear Oil; SAE 75W-85 GL-5; Fully-Synthetic; For Differentials; 1 Quart;
75W85 GL-5 Gear Oil - fully-synthetic, popular in Toyota differentials, ester-based for stable viscosity, reduced wear, contains enough friction modifier for most LIMITED SLIP DIFFERENTIALS

Didsay hypoid on bottle too
Aug 7, 2026 at 6:21 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
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Hi:

I feel that will be fine. Again, Redline is a good product; you got the correct weight, and the friction modifier is in it. That sounds perfect.

Take care of yourself and feel free to come back anytime in the future.

Joe
Aug 7, 2026 at 7:29 PM
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