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Do you mean tune-up parts or something else? Is there anything wrong with your 318ti at the moment? If just tune-up parts, I would take a look at your spark plugs and change them if they haven't done in the last 30K miles or so. Also check your ignition coils while you're changing the plugs. Make sure you use the correct plugs and use cooper plugs such as, NGK and make sure they are correctly gaped. I would also change out the air filter, fuel filter as well. As for fluid, I would check the rear differential and flush it out if that haven't been done for the last 30-60K miles or so. I would also take a closer look at the serpentine belts, and all of the vacuum hoses and replace them if you find them hard and cracked.
The last thing is, depending on if you have an automatic or manual transmission, I would flush the fluid if you haven't done that at the last 30K miles or so. I use Redline products for manual and automatic transmission fluid as well as the rear differential.