Just wondering how many are still using the 75W-90 gear oil as recommended by Nissan or for towing or because lab gear oil analysis isn't giving good wear numbers have started using a heavier grade of gear oil.
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Moderator: volvite
Problem with that is when the Nissan engineer spec'ed 75W-90 gear oil for the rear diff in 2004 or earlier he was using the old SAE designation which had a cSt@100°C viscosity range from 13.5 to 24 with most 90W gear oils being made at that time at the midpoint of about 18 or higher cst's, old designation shown in the following table;LittleStevie wrote:Unless you're a gear designer with a PhD in Mechanical Engineering, stick with what the Nissan engineers spec out in the manual.