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Depends on the year of the E36. Also depends on the mileage if it doesn't take synthetic as far as switching. As far as advantages, sythetic is a better protective oil that will help with a longer life. If you have high mileage and it doesn't take synthetic then I wouldn't use it, it will cause a bunch of oil leaks because of the molecule make up of the oil. Synthetic is "slicker" so it will leak out of places regular oil wouldn't.
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