I was shopping for gear oil for my truck and did something crazy... signed up to be an Amsoil dealer. Oops. Well anyway I wanna change front and rear diffs in my 95 Chevy with Amsoil Severe Gear. Should I buy 75w-90 or 75w-110?
Which Amsoil Severe Gear for my truck?
- Thread starter dogememe
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What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
Originally Posted by anndel
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
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When I had my Gm trucks of that vintage, I ran the 75w110.
80w90 was factory fill, the 75w110 was a nice upgrade for towing.
for the 3/4 and 1 ton pickups 75w140.
80w90 was factory fill, the 75w110 was a nice upgrade for towing.
for the 3/4 and 1 ton pickups 75w140.
The factory fill is always driven by fuel economy and most truck owners do not tow. I would go to 140 if you tow.
The front diff does not have to be this high and 90 would suffice.
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If you don't tow, go with the 90w. If you do, go with the 110w. I have 75w-140 syn in mine, but only because I got it for $2 quart. No drop in fuel economy I can measure.
MolaKule
Staff member
Originally Posted by dogememe
Originally Posted by anndel
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
No, no one reduced viscosity in the 75W90 and 74W110 grades. For the rear differential I would choose the 75W110 for all-weather operation and 75W90 for the front differential.
Originally Posted by anndel
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
No, no one reduced viscosity in the 75W90 and 74W110 grades. For the rear differential I would choose the 75W110 for all-weather operation and 75W90 for the front differential.
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Originally Posted by dogememe
Originally Posted by anndel
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
My 300ZX specs 80W90 in the rear diff,so I went with the Severe Gear 75W110.
Originally Posted by anndel
What does the owner's manual suggest? In our 1993 Toyota p/u we have a camper top (Snug Top) over the bed so it's considered "SEVERE" operation so I used what they called for in the severe category.
80w-90 I believe is the factory recommendation. But last time I posted here about gear oil for a different vehicle I learned that they "thinned" each grade out for "fuel economy" so the new "110" oils are really the viscosity of the "90" oils of old.
I guess I'll get 75w-110...
My 300ZX specs 80W90 in the rear diff,so I went with the Severe Gear 75W110.
gathermewool
Site Donor 2025
How do you use the truck? How long have you had it? What's its service history?
Lots of questions.
However, know that Severe Gear is some pretty stout stuff. For a DD and puttering around picking things up here and there, I can't imagine 75W-90, front and back, not exceeding what you need.
Lots of questions.
However, know that Severe Gear is some pretty stout stuff. For a DD and puttering around picking things up here and there, I can't imagine 75W-90, front and back, not exceeding what you need.
Originally Posted by gathermewool
How do you use the truck? How long have you had it? What's its service history?
Lots of questions.
However, know that Severe Gear is some pretty stout stuff. For a DD and puttering around picking things up here and there, I can't imagine 75W-90, front and back, not exceeding what you need.
I just bought the truck recently. I plan to install a camper shell and use it to hold some random stuff and use it as a secondary daily driver. I probably won't do much towing, hauling, or off-roading. Service history on the diffs is unknown.
How do you use the truck? How long have you had it? What's its service history?
Lots of questions.
However, know that Severe Gear is some pretty stout stuff. For a DD and puttering around picking things up here and there, I can't imagine 75W-90, front and back, not exceeding what you need.
I just bought the truck recently. I plan to install a camper shell and use it to hold some random stuff and use it as a secondary daily driver. I probably won't do much towing, hauling, or off-roading. Service history on the diffs is unknown.
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IMO putting Supertech 75W90 and drive it for a few weeks to clean up and then put the soup of your choice.
Responses to this thread are closing in on 75w110 in diff and 75w90 in the front.
With a 25 yr old truck stay cheap it may fall off the face of the earth any time.
Responses to this thread are closing in on 75w110 in diff and 75w90 in the front.
With a 25 yr old truck stay cheap it may fall off the face of the earth any time.
Use the cheapest 75W-110. Save your money for other repairs.
gathermewool
Site Donor 2025
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
Originally Posted by gathermewool
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car... I was not asking whether or not I should use AMSOIL, I was asking which viscosity to get. Thank you.
Originally Posted by MaximaGuy
IMO putting Supertech 75W90 and drive it for a few weeks to clean up and then put the soup of your choice.
Responses to this thread are closing in on 75w110 in diff and 75w90 in the front.
Yep, that's what I'm gonna go with... 75w-110 in the back and 75w-90 in the front.
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car... I was not asking whether or not I should use AMSOIL, I was asking which viscosity to get. Thank you.
Originally Posted by MaximaGuy
IMO putting Supertech 75W90 and drive it for a few weeks to clean up and then put the soup of your choice.
Responses to this thread are closing in on 75w110 in diff and 75w90 in the front.
Yep, that's what I'm gonna go with... 75w-110 in the back and 75w-90 in the front.
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gathermewool
Site Donor 2025
Originally Posted by dogememe
Originally Posted by gathermewool
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car
And we'd all sleep soundly still...
Originally Posted by gathermewool
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car
And we'd all sleep soundly still...
Originally Posted by gathermewool
Originally Posted by dogememe
Originally Posted by gathermewool
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car
And we'd all sleep soundly still...
Nah, despite my history of getting rid of cars quickly I maintain all my vehicles as if I'm going to keep them for a long time. In the back of my mind I feel better running something quality like AMSOIL instead of whoever Walmart could get to make their oil cheaper that week. Especially given my "severe service" use of my vehicles and the way I choose to drive.
I'm not saying store brand oils are bad - they aren't. In fact, I've used them in the past and continue to use them in other peoples vehicles. For example most vehicles will make it to well over 200K on the original engine on Supertech conventional if changed every 5K miles. Why do we have a whole forum dedicated to motor oil then? Why do we even have synthetic oil anyway?
Originally Posted by dogememe
Originally Posted by gathermewool
Originally Posted by dave1251
Use the cheapest 75W-110. Save your money for other repairs.
This is what I would do.
I mean, by this logic everyone on here should just use Supertech for every single fluid in their car
And we'd all sleep soundly still...
Nah, despite my history of getting rid of cars quickly I maintain all my vehicles as if I'm going to keep them for a long time. In the back of my mind I feel better running something quality like AMSOIL instead of whoever Walmart could get to make their oil cheaper that week. Especially given my "severe service" use of my vehicles and the way I choose to drive.
I'm not saying store brand oils are bad - they aren't. In fact, I've used them in the past and continue to use them in other peoples vehicles. For example most vehicles will make it to well over 200K on the original engine on Supertech conventional if changed every 5K miles. Why do we have a whole forum dedicated to motor oil then? Why do we even have synthetic oil anyway?
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