Quote:
Originally Posted by Old Tele man
Q: aren't almost ALL automatic transmission fluids these days synthetic?
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I don't have my spec book handy, but there are a few that still use the older formulations.
One note about going synthetic: Not all fluids are compatible with synthetic fluid. Ford had an issue with torque converter shudder and gave it a band-aid fix of using Mercon V (actually a synthetic blend formula, not pure). When done properly it wasn't an issue but if the fluid was mixed it lead to all sorts of problems. The proper way was to drain not only the pan, but the torque converter as well. This step was often overlooked by professional techs as well as backyard mechanics. This lead to seal failure and eventually transmission destruction.
I'd recommend asking in a model/manufacture specific forum about using newer fluids in older cars. It might prevent an expensive lesson.