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Which way does the air filter go? not entirely obvious.
1991 BMW 525i

Which way does the air filter go? Not entirely obvious.

(1991 BMW 525i)
Don't have the owners manual, finding a repair manual is expensive. It's not entirely obvious with the air filter going in vertical rather than horizontal on these models.
1 answer & 0 comments
Popular Answer
on January 12, 2012
The end with 'ribs' on it faces toward the direction of air coming in from outside. The flat side faces toward the air intake of the engine.
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on January 12, 2012
The end with 'ribs' on it faces toward the direction of air coming in from outside. The flat side faces toward the air intake of the engine.
Sign in to reply

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