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10w30 mixed with 10w40?

Geo-TH,In

Geo-TH,In

Well-known Member
My backhoe hydraulics requires I use motor oil, either 10w30 or 10w40. Change the oil and filter every 300 hours.

I don"t put 300 hours in a year and it takes 5 gallons, however I can only change 4 or the 5 gallons, one gallon of oil is in the hyd cylinders and hoses. It takes about 10 minutes for 10w40 hydraulic oil to warm up when it"s very cold, winter time.

I need to change the oil. Been using 10w40 year around. Does anyone see a problem of using a 50/50 blend of 10w30 and 10w40 year around? I will use the same brand oil, valvoline.
George
 
What kind of backhoe and how old of recommendations? Oil has changed a lot in the last 50 years. I wonder if a modern hydraulic oil might be a better option.
 
I was working at a NH dealer when NH introduced their skid steer loader.
If I recall correctly, over time they tried Dexron ATF, tractor hyd/trans fluid, and engine oil.
There have been mixtures of all the above, and I don't recall it being an issue.
I would just use what works.
We were also an AC dealer. Over time they did the same thing. In tractors that ran the hyd. system with the rear end, they had you use whatever you had in the engine- usually 20 in winter, 30 in summer.
Later tractors were shipped with Dexron ATF in the wet clutch/hyd. compartments. Then it was universal trans/hyd fluid.
 
i was thinking of the hyd. oil also. if you used #32 viscosity oil it would do for the winter and summer. but if you drained the 4 gal's of 10-40 out then just replace with 10-30, cause there's still 1gal of 10-40 left. i dont believe 50/50 mixture would show any improvements.
 
I'm surprised that a detergent oil is recommended for hydraulics. Although while in the excavating business, I did know one guy that used 30 w oil in every compartment on every one of his machines.
 
(quoted from post at 08:41:18 03/20/13) My backhoe hydraulics requires I use motor oil, either 10w30 or 10w40. Change the oil and filter every 300 hours.

I don"t put 300 hours in a year and it takes 5 gallons, however I can only change 4 or the 5 gallons, one gallon of oil is in the hyd cylinders and hoses. It takes about 10 minutes for 10w40 hydraulic oil to warm up when it"s very cold, winter time.

I need to change the oil. Been using 10w40 year around. Does anyone see a problem of using a 50/50 blend of 10w30 and 10w40 year around? I will use the same brand oil, valvoline.
George
Click to expand...

Leaving one gallon in the system and then adding a 10w30 would in effect give you 10w32. Visocsity blends volumetrically. I would not worry one bit about it.
 
I looked into buying a case 580 and something letter the township had up on bid. Those used same oil in everything by design. Not a bad idea as then you only needed one oil for all.

Darn thing went pretty high.
 
2004 T5C, terramite. No mistake, 10w40. Warning label, HYDRAULIC FLUID WILL DAMAGE SYSTEM!
 
I'm always interested in what people think would happen by mixing the two.

Do people think the oil will start smoking and sizzling, then eat its way out of the backhoe and burn a giant hole in the shed floor, like out of the Alien movies?
 
I have a "modern" backhoe ( 4 years old) and a "modern" skid steer (5 years old). Both call for 10w30 oil in hydraulic system. The newer hydraulic systems need the detergent to keep the system clean. Neither one of these has wet brakes though. Wet brakes and 10w30 is a BIG no-no.
 
My take on all this what will mix with what is this: Oil is a lubricant and if you pour 2 kinds into a sump, you have 2 kinds of lubricant. Doesn't matter if one stays on one side and one on the other, or it swirls like coco in a glass of milk or homogenizes like egg whites and yokes then you whip em up for scrambled eggs.

Oil is still oil. and homogenized or not, it is still lubricant.

Mark
 
I'm not saying that this applies to any application. You will have special purpose applications, but where you can use either in the application and just because you have one in the sump, why can't you just add another.

Mark
 

To throw out a wild thought...

10-30 will work the same in cold weather as 10w-40.. both have the cold weather properties of a 10 weight. The difference is when very very hot, the 10w-40 will work better and not thin down as much as 10w-30 will.

Now, to throw a rock at this, there will be some differences depending on the brand and mix. so you need to look at the cold pour point of each mix to see the actual difference.


by mixing your mixing a good base oil with a better base oil with better additives. So I suspect your cold temperature properties will not change much, but you hot temperature will go down due to the dilution of the 10w-30 base oil being introduced to the 10w-40.

If you run the machine mainly in snow, go with a 5w-40 or 5w-30 as its superior in colder weather, lower pour point etc.. It will cost more but do the job better in the cold.
 
Since the #10 base is the same...you'd only be
thinning your summer viscosity,from 40 to 30.
I'd stay with 10-40.
 
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