Wrong oil weight in the diff.

A

AZCA jeeper

NAXJA Forum User

Location

Phoenix, AZ

• Mar 9, 2009

• #1

So what's the worse that can happen with the wrong weight? Am I looking at serious damage or...?

I changed the front diff oil yesterday only to discover today that I put 1qt. of 75W-90 and half a quart of 80W-90. The bottles look exactly the same and I guess I wasn't paying attention not only when I bought them but when I was putting it in. So not only do I have the wrong oil in there (75w) but now it's mixed with the kind it's supposed to have in there. Am I going to have to open it up again and put the right oil in or is it ok to leave it?

 

redneckboarder

NAXJA Forum User

Location

cumberland RI

• Mar 9, 2009

• #2

i use 75-90 royal purple in my diffs with no issues, i think youll be fine

 

A

AZCA jeeper

NAXJA Forum User

Location

Phoenix, AZ

• Mar 9, 2009

• #3

redneckboarder said:

i use 75-90 royal purple in my diffs with no issues, i think youll be fine

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OK, just curious. It's my first time changing the oil so I didn't want to screw anything up. The book said 80w-90 so I assumed that's all you could use.

Now I know I can use the quart of 75w Royal Purple I have laying around for the rear.:roflmao:

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Mar 9, 2009

• #4

You'll be fine. Now if you put 5-30 motor oil in your diff, that would be a different story!

 

FlexdXJ

NAXJA Forum User

NAXJA Memorial Lifetime Member

Location

Columbus, In

• Mar 9, 2009

• #5

Make sure if you have a limited slip you use the friction modifier so that the clutch pack engages!

 

the_weirdo

NAXJA Forum User

NAXJA Member

Location

Seattle, WA

• Mar 10, 2009

• #6

Your going to be fine with the mix in there.

 

A

AZCA jeeper

NAXJA Forum User

Location

Phoenix, AZ

• Mar 10, 2009

• #7

FlexdXJ said:

Make sure if you have a limited slip you use the friction modifier so that the clutch pack engages!

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I do have a LSD but it hasn't been installed yet. When I put it in and redo the oil I'll be sure to add some friction modifier. Thanks for the tip.

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Mar 10, 2009

• #8

Your mixing slightly different oils is like accidentally drinking a light beer instead of a regular. It is not a problem. You will be fine.

 

C

ceb0217

NAXJA Forum User

Location

oregon,corvallis

• Mar 10, 2009

• #9

birchlakeXJ said:

You'll be fine. Now if you put 5-30 motor oil in your diff, that would be a different story!

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??? why I ran 20w50 in a front d44 for 3 years with a lot of abuse and never had any problms I would not run it in a rear cuse its always being used.

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Mar 10, 2009

• #10

ceb0217 said:

??? why I ran 20w50 in a front d44 for 3 years with a lot of abuse and never had any problms I would not run it in a rear cuse its always being used.

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Differentials are specifically engineered for a certain viscosity and mixture of lubricant. It's always best to run what is recommended by the mfg. for best longevity. No good reason not to.