Am i right in saying that if you were to service your own car with genuine parts and according to the bmw service guide you will not invalidate your warranty? Thought id do it myself rather than pay them a packet?
No, doing the work yourself will NOT void the warranty.
In fact, they can not void the warranty on your entire car anyway, even if you use aftermarket parts, at least in the U.S. (don't know about where you are) due to the Magnuson/Moss warranty act.
Here, only the warranty on the original part that was replaced can be voided, unless it can be proven that the part caused collateral damages elsewhere in the vehicle (ex. oversized rims causing premature shock absorber wear).
You have to keep the receipts for the parts. This way you have documented proof to demonstrate that you attempted to maintain the car. Rule of thumb is an invoice for the parts and dated entries when you do the work. The manual has/had a few pages at the end to use as a journal for the dated entries.
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