Quote:
Originally Posted by ABMW
If the battery was the same specs. as the BMW battery that behavior is illegal in all 50-states. .......Use whatever oil you want as long as it meets or exceeds factory recommended specs your fine. You need not use the same brand or a genuine BMW filter. That's ludicrous!
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I don't disagree with anything you say (at least for those who live in the US, as the rest of the world doesn't have the Magnuson-Moss Act). However, implicit in your post is the assumption that the battery referenced above does meet the same specs. It may not have.
Oil is easy to meet the manufacturer's specs for. BMW publishes requirements for oil, and API SL or SM usually meets those specs. No manufacturer will require that you use their own oil. The one caution I would throw out is in regard to filters, your last example. BMW can't require you to use a BMW filter. However, they can require you to use a filter that meets the same specs, and those specs aren't published. That means that you may end up having to fight with BMW (or any other manufacturer) about a warranty claim if BMW believe it was caused by your aftermarket filter, and you don't agree. The safest is to simply use a BMW oil filter and air filter, or be prepared for a potential fight if in fact you have a failure that can in some way be related to the aftermarket filter. There aren't a lot of failures caused by filters these days, but I would put filters in a slightly higher risk category than batteries and oil (which essentially have no risk, given the ready availability of published specs).
Just my $0.02
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