Lucas synthetic 75W-90 - Should I use it?

[ledslinger]

I'm going to change the diff lube on my son's 1996 F250, I already have Lucas 75W90 synthetic gear lube and don't know if I should use it or get some Super Tech. Lucas products don't have a stellar reputation here and I don't want to put [censored] in his truck, but I'd like to use it since I already have it.

 

[skyactiv]

I'd go ahead and use it.

 

[CT8]

What is the proper recommended viscosity for the unit?

 

[ledslinger]

Originally Posted By: CT8
What is the proper recommended viscosity for the unit?


80W90

 

[beanoil]

Nope, SD should have 75w140.
And I'd say that even if it wasn't LuckAXX.

 

[aquariuscsm]

You can always swing by Ford and grab some Motorcraft fluid.

 

[4WD]

Every silver lining has a cloud - That makes for better choices ...

 

[toneydoc]

Read the owner manual and use the specified and appropriate grade fluid. Especially in somebody else's vehicle

 

[blupupher]

I used Lucas in my F150 (75w-140 though) with no issues.
Proper viscosity is more important than brand IMO.

 

[ebr1190rx]

Its in the rear diff of my jeep grand cherokee as 75w-140 with no issues and towing.

 

[zeng]

Originally Posted By: blupupher
I used Lucas in my F150 (75w-140 though) with no issues.
Proper viscosity is more important than brand IMO.

+1.
It's about higher KV@40*C.
It's not about brands, or mineral/synthetics noise.

 

[Lubener]

Originally Posted By: ledslinger
I'm going to change the diff lube on my son's 1996 F250, I already have Lucas 75W90 synthetic gear lube and don't know if I should use it or get some Super Tech. Lucas products don't have a stellar reputation here and I don't want to put [censored] in his truck, but I'd like to use it since I already have it.


Send it to me and I will let you know if its good.

 

[Shannow]

Not a fan of Amsoil marketting, but...

http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf

 

[chartkor]

If this is true, no wonder that people swear by Amsoil products.
So glad that I picked up Amsoil ATF to change oil in transfer case on my G37.
Was going to pick up Amsoil for diffs as well in next couple weeks as I start my spring maintenance, now I am even more convinced to stick with Amsoil oils.

 

[another Todd]

Like beanoil said, I also think the correct weight for a F250/350 rear end is 75-140.

 

[blupupher]

Originally Posted By: Shannow
Not a fan of Amsoil marketting, but...

http://www.lastgreatroadtrip.com/wp-content/uploads/2010/11/gear-oil-comparison.pdf


This 10 year old study gets brought up every once in a while. Lots of discussion on it.
Really not valid today since we have no idea what has changed in that time frame.

 

[Shannow]

That's a fair call, most definitely.

Just Lucas (and others) seem to have a fairly loose interpretation of what a specification is.

 

[ledslinger]

With trepidation my son's truck diff is filled with 3.7 quarts of Lucas synth 75W90. Following pouring it in I read the above gear oil test and how poorly the Lucas gear oil did in that test. I'm hoping that test was an aberrant sample and isn't representative of usual quality. That optimistic perspective is all I've got. Amazing to think I could have put in worse lube than I drained out.

 

[kschachn]

Originally Posted By: ledslinger
With trepidation my son's truck diff is filled with 3.7 quarts of Lucas synth 75W90. Following pouring it in I read the above gear oil test and how poorly the Lucas gear oil did in that test. I'm hoping that test was an aberrant sample and isn't representative of usual quality. That optimistic perspective is all I've got. Amazing to think I could have put in worse lube than I drained out.


An honest question, why would you believe that?

 

[MolaKule]

Have the Lucas analyzed with a sulfur report and we can look at the analysis and see if the EP package is sufficient or if it is undertreated.