[DeTomaso] Motul zf oil

[Robert Stroj]

Hi,

Got some occasional grind on quick third-to-second gear changes; if I take
time it shifts smooth, but it grinds sometimes if shifted quick.

As I have not changed ZF oil for over a year and am not sure what oil is in
there, I want to first change the oil and see if anything improves.
Reading the recommendations was ready to get Redline 75W90NS, but there are
just 3L locally on stock.

As alternative, was offered Motul Gear 300 LS 75W-90  
https://www.motul.com/us/en-US/products/gear-300-ls-75w90

Does anyone have experience with this and would it be fine to use in ZF-1 ?
I would need 4L; is this correct?

Thanks, Robert