Please note that the 3157 bulb is not meant to be used for DRL bulbs, even though it will fit and work - it will burn out easily. The 4157 bulb is made for this and will last like OEM intended it to. This is according to dealership.
Personally, I am not sure what the difference is. This is what a dealer told me after I kept installing the 3157 bulb in there and it kept blowing out. I started using the 4157 and no more problems.
I have seen some companies claim that their 3157 and 4157 are the same...go figure
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