5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
In general you will get this answer because the 550i has a V8 engine and the 535i has a turbo. The 528i has a straight-six. A more straight-forward design with less moving parts increases reliability. However, any of these cars can and will last a long time if properly maintained.
i had a E34 525i and by far the best car i ever owned.. Never had any trouble with it but i always done an oil and filter service every 5/6 thousand and when i bought it, it came with a full bmw service history. Had it for 4 years..
I believe your 525 is basically same as 528i or 528i came from 525. That is probably why 528i is considered most reliable BMW series. Perhaps, BMW learned from 525 to produce the later.
I am glad to hear you have had good luck with 525. I hope it last over 200,000 miles! Look under car and under hood. You really can tell it is well designed and well built.
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