[Shop-talk] gear vs bar oil

[Brian Kemp]

I'm interested as well, but from a 10w40 perspective leftover from a 
previous car.

>From https://www.oildepot.ca/what-is-the-viscosity-of-bar-and-chain-oil/ 
and https://www.remodelormove.com/what-viscosity-is-bar-and-chain-oil/ 
it appears bar oil is about 30W, so my first though was gear oil might 
be too thick.

One quote from the first link:

Can Motor Oil Be Used As Bar And Chain Oil?

"Can you take a 30-weight motor oil and use it as a bar and chain oil? 
This is not a good idea. Bar and chain oils have additives called 
“tackifiers”. These additives prevent chainsaw oil from flinging off 
during high-speed operation. The tacky oil clings to the bar and chain 
links to prevent dry operation."

I kept looking and found 
https://toolspulse.com/what-can-i-use-for-chainsaw-bar-oil/ which 
equates ISO weights with SAE weights:

"SAE 30 oil is equivalent to ISO 100 grade bar oils, SAE 40 is identical 
to ISO 150 bar oils..."

The above link also contains a viscosity chart that included SAE gear 
oil, which also appears to be yet another scale, adding to the confusion.

Brian



On 5/28/2023 1:23 PM, eric at megageek.com wrote:
> OK great minds of the internets, quick question...
>
> I use a lot of bar oil since I cut trees.
>
> I have lots of different gear oils that I will most likely not need. 
>  In many cases, I needed a few ounces and had to buy a gallon of it.
>
> My question is, can I 'mix' some of the gear oil in with the bar oil? 
>  If so, what would be a max ratio?  I want to use up the gear oil and 
> get rid of these huge containers, but I figure this would be a good way.
>
> Any other places I can mix it?  I don't think I would try it in 
> hydraulic fluid.
>
> So, what's the collective wisdom say here?
>
> Thanks.
>
> Moose
>
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