5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I would change them personally. I upgraded to NGK Iridiums last year and they made a huge difference. When you remove your plugs I would check to see if they have any buildup on them. If not, your engine is running well.
Cabin air filters are less important, but I change them whenever they start to get nasty looking. I don't use the air that much as I prefer to roll down the windows.
I can't really explain the before and after. To me, the car on startup was much better and my fuel mileage went up. My other plugs were pretty shot though so new plugs regardless would have made a difference. The Bosch Platinum +4's are also pretty darn good too.
found an other option, pulstar with price 3 times more than NGK & I am thinking seriously to try them unless someonew had bad experience with them. I shall wait for two days after this post & if no negative feedback received then I will buy them & will keep you updated on the performance .. thanks for your help again.
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