I am not exactly sure about their compatibility. I couldn't find another liter of lsa90 on nearby shops, my extra liter was the excess liter I bought for my terrano that I sold recently.

My assumption is that gl-5 gear oil with lsd additive can be used as substitute, so I just adding .5 liter of gl-5 oil is ok since the diff needed 1.5 liter. The assumption does not have any scientific basis just guess work, since I needed to decide if I use 1 liter oil or 1.5 liter of mixed oil.

I just wish I wasn't too kind to give my extra .5 liter of lsa90 to the new owner of the terrano as his sample.

Thanks speedfix for the advises. I will observe and change the oil when I am able to buy 2 liters of lsa90 again.