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You need to think about what you are going to be using it for. Also, whether the oil is synthetic or not. Buying good oil is very important. Synthetic oil is not always good.
No, I would not recommend using synthetic in an engine this old. Use a good 10w40 conventional oil.
No. If your using regular oil it should be changed along with the filter every 3000 miles. If you are using synthetic oil it should be changed with the filter every 5000 miles.
If your engine leaks oil, no you should not use synthetic oil because it will clean sludge and can make the leak worse. If your engine does not leak oil, I would highly recomend using synthetic oil(Pennzoil Ultra 10W30 from Walmart is a good and pretty cheap choice). As long as your engine does not leak oil using synthetic oil is a great choice regardless of how old it is.
Yes, your 50% off coupon is good for an oil change using synthetic oil. The coupon is good for an oil change using any oil of your choosing.
If it is the synthetic blend, you should change the oil every 3,000 miles. If it is a full synthetic, you should change the oil every 5,000 miles.
Read your drivers manual. Your vehicle may require a synthetic oil.
Change the oil and filter every 5,000 miles if you are using conventional oil or every 7,500 miles if you are using synthetic oil.
the 328i BMW if it is the M52 engine should be using 5w30 synthetic oil, same as the 2.8 Z3
Every 5,000 miles is the max i would go, and you should be using synthetic oil only.
With Mobile 1 Synthetic Oil - 30, Its usually around $50- $55.
That's easy synthetic oil. Ill tell you why it sounds better