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No, if anything it would be higher. Most likely someone was running 10-40 or even 20-50 weight to keep the pressure high enough to keep the light off. Heavier oil will raise pressure, but, according to many, can do a lesser job on engines, especially in winter. If the engine has a lot of wear, you might want to run a 10-40 to help out, or a 0-40 synthetic. First though if you have any way of getting a true oil pressure test done cheaply, you might find you only need a new oil pressure sender unit. Could also have a plugged screeen on your oil pump, but you would have to drop the pan to be sure.
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