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Esourcedesigns
 
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Default 40W oil causing wear problems over 30w?

WRONG! Automatics are not bathed in oil. Over half the fluid is in the torque
convertor while the remaining is held in the pan for the valve body and the
clutch packs. The reason why "bathing" the gears is not critical at startup is
there is no stress or load on any tranny gears or bearings when the damn thing
is in park and you're cranking the engine.

Dennis
ASE Certified Master Auto Tech and
Marine Engineer in training

Transmission do not suffer from dry bearings at
engine startup (as the engine does) because the gears are bathed in oil.