engine oil

[McNally]

whats probably the best enigine oil to run in older bmw's ive heard a few different brands spoken here and there. just curious. By older bmw i mean specifically my 89 325.

 

[Big Daddy]

What is the mileage and does the car have any "oil" issues at present?

 

[jrt67ss350]

I always ran Mobil 1 in my '87

 

[Doughnut]

I run castrol GTX 2

 

[echothreezero]

Lots of different schools of thought here. I run a 10w40 quality brand mineral due to the age of these cars. Generally speaking a pre-90's car will have been run on mineral most of its life and the motor will have been designed to run on around 20w50. 10w40 mineral for me makes sense as a good compromise between new oil technology and what the motor was designed for.

Others swear by the new synthetic blends.

If you rebuild the motor go synthetic - if its an older high-mileage example go for the mineral.

Thats my $0.05c