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Discussion Starter #2 (Edited)
Research suggests GL4.

I'm confused which is the correct oil. ELF have 2 types of 75W80 GL4.
One called NFJ and the other is NFP.
They both state compatibility with the J and TL4 gearboxes.

However, the data sheet I attached suggests J and TL4 gearboxes require TRJ/NFJ oil. Not NFP!

NFJ:
https://catalog.elf.com/en/products/nq7 ... NFJ-75W-80

NFP:
https://catalog.elf.com/en/products/nq8 ... NFP-75W-80

NFJ appears to be semi-synth.
NFP seems to be for extreme usage and fuel eco friendly. Doesn't say if it is semi or fully synth.
 

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Discussion Starter #3
ELF NFJ (75W80 GL-4) is the recommended transmission oil for my vehicle. The ELF website suggests that it is semi-synthetic. If my transmission contains fully synthetic oil, and it mixed with the new semi-synthetic oil from ELF (as recommended for my unit), will this have a negative impact on anything?

Thank you.
 

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Discussion Starter #4
Update. Drained the gearbox. Around 2.5lt of old oil drained out. I syringed new oil into the filler port until it gushed out. Waited for the excess to drain out of the fill port, then replaced fill cap. Runs great. Downshifting is much smoother.

Oil for JH3 trans is NFJ ELF 75W80 GL4. Don't use GL5 oil, even though some car stores have this as the required oil for this trans.
 

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