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It depends on the car, and what quality of parts and consumables (engine oil, filters, etc) that I use. Some things are "by the book," other things take longer since I really don't need to change them. I do use Amsoil products where I can, which includes their Performance Improver (Injector Cleaner.) I also change the power steering fluid occasionally, even though not all manuals say that you need to. I've seen how the fluid eventually gets burnt and turns black, if you don't.
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