question The best Hydraulic fluid to use.

[BTmurray]

I thought I seen a thread on the best hydraulic fluid to use book calls for a 80w/90 GL-4. What is everyone using as GL/4 is hard to find and can only find it in quarts

 

[Robertzetor3340]

75W-90 is OK to use as I could not find the 80W-90.​

This is what I was able to find: Ultra1Plus SAE 75W-90 Synthetic Gear Oil, API GL-4 (5 Gallon Pail) | eBay - https://www.ebay.com/itm/333676978297

Here is some more info about needed oils: question - Zetor 3340 - What kind Hydraulic/Transmission oil and filtre do I need ? - https://zetorworld.com/threads/zetor-3340-what-kind-hydraulic-transmission-oil-and-filtre-do-i-need.5538/

 

[BTmurray]

Thank you. Very very helpful.

 

[Joachim]

GL 4 is important - never use a GL 5 Öl in your Zetor 3340 gearbox / hydraulic