What is the difference between a 15W40 Heavy Duty oil and a 15W40 Marine? I CAN NOT FIND Pennzoil 15W40 Marine anywhere and I want to change the oil tonight vs. three weeks from now when I get my quarts from the Internet. Also, are most people very loyal to filters or could I use a fram instead of the pennzoil pz3? Just curious - i've never really cared about oil in my car before, but muh boat is muh baby....
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