Mix equal qts of 0w-20 and 15w-50 will make 5w-30?

[sdowney717]

I need to fill my transfer case and it take 5w-30 preferred or 5w-40 oil and have several qts of what's in the title. These are synthetic Mobil 1 oil.

If not, then why not? I need 1.5qts to fill it up.

 

[benjy]

there is a formula for mixing + be aware thin oils have additives not suitable for wet clutches. for better answers more information is better, unless you prefer not to get negative info. viscosity is only part of a lube as different applications REQUIRE different additives!

 

[PimTac]

What vehicle is this? Make and model year.

 

[SubieRubyRoo]

The "winter" W ratings do not "blend" like the viscosity does. Read some on this site.

What's cheaper, replacing your transfer case because you wanted to save $5 and mixed it full of incompatible fluids, or buying the right fluid for the job? Answer: always use a fluid that meets the specs of the equipment in question.

 

[wemay]

https://www.widman.biz/English/Calculators/Mixtures.html

 

[Hall]

My math, admittedly I did it in my head, says equal parts of "0" with equal parts of "15" equals 7.5, not 5. Strictly speaking of the math, not the "W" part.

 

[Mad_Hatter]

Originally Posted by SubieRubyRoo
The "winter" W ratings do not "blend" like the viscosity does. Read some on this site.

What's cheaper, replacing your transfer case because you wanted to save $5 and mixed it full of incompatible fluids, or buying the right fluid for the job? Answer: always use a fluid that meets the specs of the equipment in question.

There's a good chance he's already done it and just seeking reassurance(s) he didn't #$&+ up!...‚

 

[Jimmy_Russells]

Originally Posted by Mad_Hatter
Originally Posted by SubieRubyRoo
The "winter" W ratings do not "blend" like the viscosity does. Read some on this site.

What's cheaper, replacing your transfer case because you wanted to save $5 and mixed it full of incompatible fluids, or buying the right fluid for the job? Answer: always use a fluid that meets the specs of the equipment in question.

There's a good chance he's already done it and just seeking reassurance(s) he didn't #$&+ up!...‚


100%

 

[OilUzer]

FYI, They sell 7.5W35, 7.5W45, etc.

HKS Oil

 

[kschachn]

Those are not SAE grades and are meaningless.

 

[benjayman227]

Originally Posted by OilUzer
FYI, They sell 7.5W35, 7.5W45, etc.

HKS Oil


That 7.5W-33 diesel blend is dope. Imagine walking into a US parts store asking for that...

 

[oldhp]

15W50 and sleep well. The very worst thing would be a little hard shifting when extremely cold.

 

[demarpaint]

Originally Posted by kschachn
Those are not SAE grades and are meaningless.

We need a sticky to explain that. It comes up often enough to be worthy of one for all the Frankenbrewers seeking answers to home blending oils.

 

[4WD]

Originally Posted by sdowney717
I need to fill my transfer case and it take 5w-30 preferred or 5w-40 oil and have several qts of what's in the title. These are synthetic Mobil 1 oil.

If not, then why not? I need 1.5qts to fill it up.



Are you sure it does not call for syncromesh (that winds up similar to that vis, but different chemistry)

 

[4WD]

Don't the mixes really come out W-whoknows ?

 

[BKTX]

Short answer is no.

 

[JLTD]

Don't count on it.

 

[sdowney717]

There are no clutches, or chains. It is just gears. It is for a 1996 Trooper. I see nothing wrong with doing this. It could take the thicker oil but it would be stiffer when cold. The recommended oil is 5w-30 preferred but also 5w-40 is acceptable.
What do you suppose happens to engine oil when you mix 15w-40 Valvoline with 1 qt MMO a 20W oil? It cleans the motor and you can leave it in there a long time. I did that to remove the varnish off the stuck lash adjusters, took 3 days to quiet it down. It works so well, my plan leave it in till the next oil change at the regular interval. I also used a BOSS filter. Engine i 3.2L V6 SOHC Isuzu Trooper.

I know I never changed the Transfer case oil when I got this in 2013, and my daughter took ownership, then my son in law drove it, so its past due as is the rear axle that is a LSD.

 

[1978elcamino]

Originally Posted by benjayman227
Originally Posted by OilUzer
FYI, They sell 7.5W35, 7.5W45, etc.

HKS Oil


That 7.5W-33 diesel blend is dope. Imagine walking into a US parts store asking for that...

Not all the parts store counter guys are dummies, but I bet quite a few would actually go looking for this viscosity.