I just bought an 85 defender rhd 2.5 non turbo diesel I need to know if there a more readily available oil filter for the 2.5 non turbo diesel. What would be the best replacement gear oil for LT77 and the transfer case? I appreciate all help. I'm in the usa and going to britian to all parts gets expensive. Thanks all

 

Take your old oil and air filters to NAPA, they can cross reference them.
As for the trans, Redline MT.
As for the t-case and diffs, any G-4 gear lube you want.