Well you hear the horror stories all the time- synthetics clean alot better, so an engine or tranny that uses conventional will not be as clean as it can be, but after time some of the gunk and dirt helps the seals-- well, seal...so when you switch to synthetic after using conventional for so long, it actually cleans out stuff that was helping.
This may be myth, I myself have never confirmed nor busted it.
I've got my own theory about automatic trans fluid changes and that is that all of the torque is through clutches and friction, so if a clutch breaks in with conventional, I would try my hardest to use the same type every time after..."it's all the same" yeah, but it's engineered differently, hence the insane amount of companies making fluids- they can't all just re-bottle the other guy's stuff...so break it down, it's not all the same. And clutches, well they don't like change much.
I feel like I'm rambling...I'm on 2 hours of sleep and 24+ hours of awake :lmao:
