I am changing differentials , transfer , and transmission fluids in my 4 Runner
to Mobil 1 full synthetics and was wondering if I need to flush out all old conventional oils out prior to adding the new synthetics ? Don't know if both are compatible or what ? Any help would be greatly appreciated > THANKS


" 93 4Runner 3.0 5spd. OME coils and shocks Downey torsions
" 95 EXT Cab 3.0 5spd. Rancho shocks and springs Downey torsions

 

The common misconception with synthetics is just that, that they are completely man made.
Most sysnthetics can be easily mixed with non-synthetic because they are simply made via a futher refining process(es).
It is the extra refining (and marketing) that gives synthetic its exorbitant pricetag.

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