Periodic loud ticking immediately after oil change M50

[John B.]

Our 95 525iT has about 140,000 miles on it & I've run Mobil 1 0w/40 ever since we bought it with no ticking issues.

[Russell]

John, I am interested in the oil change history of your car.

Mine had convetional oil changes, per the service lights-every 6,000 miles by the previous owner until I purchased it at 72,000 miles. I noticed a cold start rattle with heavier oils say 15w40 oil. Tried Mobil 1 for several changes. No cold start rattle, yet engine seemed noiser and UOA showed high lead. No warm iddle issues.

Finally tried 0w30 Castrol Syntec (german castrol). Started getting a warm idle rattle. Now my Brew of 2 quarts of 10w40 and 4 quarts of 5w50 does not have the warm rattle.

Even so, I think I will go with a 5w40 or 5w 50 next tiem as I think MY engine for some reason does not do well with a 0 weight oil. Perhps even a heavy 30 weight oil. Perhaps the oil pump is not working well at low rpm. ??? Anyway, just my experience.