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15w-40 will be fine. In fact, I've run 15w-50 quite a bit in my 80. Rotella has a good rep, I like Chevron Delo, but not for any scientific reason, maybe it's the blue bottle.
I am surprised more people do not run the heavy duty oils. Delo or Rotella have to be about the best bang for the buck in oil out there.
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Andrew
1971 FJ-40 Rubicon tested, 2F powered, some mods
1976 FJ40 Rusting slowly in the back yard
1984 FJ-60 H55f, 4.11, OME, Daily Driver
1989 FJ-62 117k-son's driver for now-low and slow
1997 FZJ-80 Driveway queen
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