When your BMW was new, the recommended oils were relatively thick conventionals, including 20W-50 down to around 4F.
Oils are better today and you probably don't run OCIs as long as BMW would have recommended back in the day.
This is an OHC engine, so the valve spring presures will be pretty low.
No need for a lot of ZDDP, and the oils of the days of this car's youth wouldn't have had much anyway.
Any 10W-40 would work well year 'round in this old guy.
It works great in my e36, which has a timing chain rather than the belt your 325e has and has much higher specific output.
The 325e isn't a powerhouse, after all.
You'd be fine in any weather with either Maxlife or Defy 10W-40.
Oils are better today and you probably don't run OCIs as long as BMW would have recommended back in the day.
This is an OHC engine, so the valve spring presures will be pretty low.
No need for a lot of ZDDP, and the oils of the days of this car's youth wouldn't have had much anyway.
Any 10W-40 would work well year 'round in this old guy.
It works great in my e36, which has a timing chain rather than the belt your 325e has and has much higher specific output.
The 325e isn't a powerhouse, after all.
You'd be fine in any weather with either Maxlife or Defy 10W-40.