> My 1986.5 PickUp manual '86 D21-D
> calls for engine oil API SF
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>
> Thank you
All Dexron AT fluids are backwards compatible. 3 will work with 2, and
also with 1 etc.
For the oil, Nissan's normally recommend 10W30 being the thickest oil
to use. I would stick to that. Using 10W40 may accelerate sludge
formation over time, like several oil changes worth.
CD