I have a Whirlpool front load washer Model no. GHW9150PWO. Today I accidently used liquid Tide for regular washers instead of the "he". I saw a lot of suds and panicked. What could possibly go wrong from one such mistake? thanks ziv

If you run the machine through another cycle with cold water ad an extra rinse option selected you are most likely going to be ok. It is very good that you are conscientious enough to worry about such a mistake, but chances are this one time mix up will be no harm no foul. Just run it through to clear the excess detergent and you should be all set. Continuous use of the wrong type/too mush detergent will most likely cause failure of the rear tub bearing resulting in first loud noise during spin and finally catastrophic failure causing the inner tub to become too loose and grinding against the outer tub.
You're thinking about it so your fine!