heavier oil in older engines-good idea?

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2,183
Location
Lexington, KY
Is it better to use heavier oil in older engines? For example I have a 95 BMW 525i with 113,000 miles. I currently run Mobil 1 5w40 truck and suv. I have heard that older high mileage engines just work better with thicker oil. Even more so with BMW engines?? Because of thise issues I have thought about Mobil 1 15w50 for summer driving? What do you think?
 
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2,480
No, unless you have consumption issues or require a higher viscosity (eg. towing, racing, consumption). Otherwise, a A3 rated 5-40 synthetic will suffice. That said, I'm still using Syntec 5-50 year round to curb consumption during my 10k OCI.
 
Messages
3,118
Location
San Antonio, TX
Do you think your car is at the midway point of it's lifetime? Of the three oils mentioned so far, you should choose the one with the highest zinc number for the best oxidation protection.
 
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