F30 Autobox service?

Discussion in '3 Series' started by bmwzoom, Mar 12, 2019.

  1. bmwzoom
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    bmwzoom

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    Hi,

    Has anyone bothered to service there F30 8HP auto box? ZF recommend you do and as mine is reaching 100K I was debating as wether to do it or not? I have no issues
     
  2. Highsided
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    Highsided Site Supporter

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    You're already way past ZF's recommended change interval (62k miles). You take your chance. Do it, don't do it. Maybe it'll be OK, just as you might get away with not changing the engine oil. You won't have issues until you have issues, and by then it can be too late (to avoid an expensive repair)
     
  3. bmwzoom
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    bmwzoom

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    And your point is?
     
  4. bishbosh
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    bishbosh WARLORD Site Supporter

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  5. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    I read his reply as being, are you prepared to take a risk?

    It's very much a personal choice, some have reported changing the oil & filter and still had problems - others the reverse.

    It's why I favour manual 'boxes.....:driving: :getmecoat:
     
  6. JasonH
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    JasonH

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    In mind, and logically, it's much like the engine oil. If you don't change it when it's due you won't immediately notice a difference. Over time the oil will lose it's lubricating properties and also be carrying too much debris. You could probably (and people do) miss entire oil changes, it's not good for the engine but you might get away with it.

    As most people know ZF recommend gearbox services, even BMW recommend gearbox services in the USA. However it seems BMW UK have gauged you can get away without changing the gearbox oil within what BMW consider the life of the vehicle (100k miles). If it subsequently fails then that's either a nice parts sale for BMW or another car taken off the road and someone in the market for a new car.
     
  7. bishbosh
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    bishbosh WARLORD Site Supporter

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    I've read posts on various forums warning of potential risks of changing the gearbox fluid after leaving it too long. I think with the conception that changing the fluid would dislodge crud, etc. In an engine combustion products from piston ring blow by will naturally settle in the oil and over time without regular oil changes will build up and potentially be dislodged when doing an engine flush. In a gearbox there won't be any blow by and in general what you get out is what you put in - although maybe a different colour. The fluid doesn't congeal like engine oil would. The only debris I can think of would be either carbonised fluid and metal particles - which would be trapped by a) the magnet or b) the filter. I know fluid can come out smelling a bit burnt but if there's serious carbonising going on then IMO it's being driven too hard!
     
  8. Mieke
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    Mieke WARLORD Site Supporter

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    If @bmwzoom 's car is running fine at 100k, then a transmission service and new oil should pay dividends. I don't see any downside, as long as the work is done properly.
     
  9. JasonH
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    JasonH

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    There used to be a problem years ago with GM gearboxes in the E39. Those boxes tended to shed a lot of fibrous friction material that did indeed get dislodged by an oil change.

    I have never heard of the problem with ZF gearboxes.
     

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