how many miles should he run?

[myfirst100]

hy to everyone.I just become the owner of a 525i automatic BMW from the '90 and it hawe 190k miles.it starts and run ok and I wonder how much will it last if I treat it nice(whell I'l try)or if I should look for another engine.Bytheway the transmission is a litle harsh when it change somebody know how expensive is to pas at a 5 speed gear box?

[Jay 535i]

Hello, and welcome!

If the engine is well-maintained, you should easily achieve 300,000-400,000km.

Engines and transmissions for these cars aren't terribly expensive, but you probably don't need a replacement; just some maintenance.

Sorry I can't tell you more, but others around here surely will. I'm not the expert. :)

[632 Regal]

right, rule of thumb is 300k then replace engine. Thats if the compression is low. Chances with a well maintained motor with synthetic is it will last much longer...and yes you can beat on it every now and then without hurting it.

[winfred]

the m20 I motor if cared for is good for a good 300k miles by then it will probably want some head work, crappy treatment will get it about 200k miles before a head rebuild, the bottom end doesn't really wear out

[Paul in NZ]

and yes you can beat on it every now and then without hurting it.


just dont sit still revving at 5000 rpm for 15 minutes

[winfred]

had a head come in from a 87 325is from a car that was part of a inheritance, aparently sister got it and brother didn't like that so he took it around the block a few times in first gear, i have never seen such valve train wear in my life even on a mercedes (the old 190/300e motors eat cams/rockers like popcorn and i had one 190 that was close), everything was so worn the cam wouldn't open the valves anymore, the oiling system is just not designed to deal with that kind of operation, maybe with the right grade of synthetic and a bigger oil cooler


just dont sit still revving at 5000 rpm for 15 minutes