I'm soon to get my fall oil change- just wondering what do people use for winter oils. I live in NJ near new york city but often am in Troy, NY (near albany) , so its not too cold but I'd say an average temperature on a winter day is about 10-30 degrees F (low to high).

I've been using Mobil Delvac 15W40.

Also would there be any advantages to using a synthetic?

Thanks.

Also, if anyone lives in either of the areas I mentioned above I have had some problems with my car I posted in this thread -
1991 350SDL car shutoff problems, turbo problems --> i just want my damn car to work

I am looking for someone in the area I can possibly meet up with to help me diagnose the problems and *hopefully* fix them.

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1991 350SDL (Navy Blue) - 278k