what is the best motor oil to use on 1991 BMW 525i

what kind of motor oil is best to put in the 1991 525i bmw?

Asked by for the 1991 BMW 525i
When it comes to engine oil everyone has a preference or anecdotal evidence why one oil is better than another. Engines that have higher mileage or have started to "burn oil" ,I would have no problems recommending a higher viscosity oil perhaps 20/5/0 thicker oil should give adequate protection and "burn" less oil. The key to long engine life is frequent oil changes!