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Go ahead and drive it, it won't hurt your engine. Power steering fluid, is basically automatic transmission fluid, it is an excellent high quality lubricant, altough it is lower viscosity than motor oil. >>
Give out misinformation much?
Power steering fluid is not even on the same plain as oil. It's like comparing water to Coca-Cola, they are both liquids but that is as far as the similarities go.
If you have driven it already then I suggest you drain the oil at the earliest possible convenience, flush it through with new oil a few times, and change the oil filter and that means
DON'T DRIVE IT until you do these things!!! .
If you havn't driven it I suggest the same as in the previous paragraph except I would be much more comfortable in telling you that you have not done any irreparable damage to your engine, although with the small amount of power steering fluid you put in there it really shouldn't make much difference but it's just not as thick as oil so if you were at all low on oil it could further lower the engines capacity to lubricate which in theory could cause problems, just not likely. Personally I'd change the oil as mentioned and never give it another thought.
If you have driven it with the psf in it I can't say that with the surity that I can if you hadn't, but go through the procedure I mentioned nevertheless.
Good luck. BTW, how could you mistake a bottle of power steering fluid which is a totally different shaped bottle than that of an oil container? In any event, I suggest you have a mechanic take care of all future work you have done on your vehicles, including general maintenance, because it seems to me you should stick to your day job and leave the car stuff to qualified individuals, or at the least make sure they are competent.