Outer Limits 4x4 Board

Hello everyone! I have a sierra. Standard gearbox. With reductions in transfer. Stock open front diff but locked rear.
Now i have been running 80/90w oils in them. Cant remember which in where.
We have alot of gear oils at work. I am allowed to take some if i want! Yay!
The main oil is called Optigear BM220, It says on the drum. Bevel gears etc etc all bearings etc.
Can anyone tell me if its safe to use as drivetrain oils?
There are other oils but they all mainly say extreme pressure gearoil etc.
Help! Thanks. (at wrk on small fone atm cant google!)

80 is what i have just put in my rear diff and transfer,

i am not sure if the bm220 will suite your application,

http://www.castrol.com/liveassets/bp_in ... eu_tds.pdf

the site says it is 220 viscosity(which i thought it was from the name of it but wanted to make sure)

it would probably be to thick for a car gearbox, if i remember correctly to when i was working in a manufacturing place as an apprentice fitter, we used that oil on big bull gears( one gear beeing about 500 mm dia, and the other being about 1.5m dia), with large forces and working loads,

i think it would just be way to thick. however that is only my personal opinion.

what i have learned from moving on to hydraulics after finishing my apprentice ship last year, is that although all oils have to meet the ISO grades(or should), some still have far more additives than others, like the anti wear and all that. (it was explained briefly and basically so i don't remember a lot of it) so even though one oil might be an 80w, and the next one is too, the difference between brands can actually some times be quite large.

so finding a good brand of the same oil your using would probably be a good idea. as far as i have been told fuchs is good, ment to be pretty top quality, and some times the places you go to can mean all the difference, i got 20 litres of 15w30 engine oil from our oil supplier(which is ment to be reasonably good oil), for less than i would have bought 10 liters for in any of the auto shops we go to, and the oil i was looking at in the shop was ment to actually be not that good(which i didnt know at the time) until they guy that actualy runs the shop said its crap.

http://www.qplubes.com/

try them

Al

whoa! What a reply! Thanks. I will have to do more reasearch but what you said is right about different brands and weights etc. I never mix my oils because of that.