This information is taken directly from the 328 Owner’s Manual. It covers the Ferrari 328 GTB and Ferrari 328 GTS. These are the 1989 specs, yours might vary but you’ll get the idea. (Note: This doesn’t include updates from service bulletins and everything should be confirmed with your mechanic.)
This is here for three reasons:
1) The owner’s manuals that I can find online are too small & blurry to really read all that well and since they are in 3 languages, they are cumbersome to read.
2) There is a TON of misinformation and disinformation out there, mostly from people who read message boards and don’t bother to read the manuals. A little deferred maintenance can be much more expensive than just doing it right.
3) As a way of informing prospective 3×8 owners about what lies ahead. After reading this some might opt for a Toyota instead.
So let’s get into it and remember, this is direct from Ferrari.
Replace engine oil and filter. – 600 to 1000 miles then every 6250 after that. (I have to believe that you should change the oil more often than this. I’ll look into it but I’d do it every 3000-3500 or so.)
Check gearbox and differential oil level – Every 6,250 miles.
Replace gearbox and differential oil – Every 12,500 miles.
Battery: check connections and charge condition. – 600 to 1000 miles then every 6250 after that.
Check brake fluid level, bleeding if necessary – Every 6,250 miles and replace fluid completely every 12 months.
Check brake disks and pads for wear every 6.250 miles.
Check entire brake system at 600 to 1000 miles and then every 6,250 miles.
Check belt tension of alternator, water pump, and A/C. 600 to 1000 miles and then again at 6,250 miles, 12,500 miles, 25,000 and 31,500, then at 47,500 and 50,000, and again at 62,500. There are belt changes in the gaps, see below.
Change belts of alternator, water pump, and air conditioning every 18,750 miles or every 24 months, maximum. Note that this is in between the gaps above.
Clutch pedal adjustment – Every service starting at 600 to 1000 miles and then every 6,250 after that.
Check play on brake pedal. Adjust and lubricate hand break – 600 to 1000 miles and then every 6,250 beyond that.
Change air cleaner element. – Every 6,250 miles.
Sparking plugs control (replace if necessary), rotors and ignition connections. – Every service starting at 600 to 1000 miles and then every 6250 after that.
Check and adjust valves’ clearance and cylinder head torque. – Between 600 and 1000 miles and at every 6250 miles thereafter.
Check timing belts for wear and condition. – Every 6250 miles with new belts installed at 25,000 miles and 50,000 miles or every two years at a maximum. (If you don’t do this and you break a timing belt you will do serious engine damage.)
Check water pump, lines, and connections of cooling system. – 600 to 1000 miles and then every 12,500 miles after that.
Clean blow-by system – every 25,000 miles.
Replace fuel filter every 6250 miles.
Inspect pipes and connections of fuel injection system. – 600 to 1000 miles and then at 12,500 mile intervals.
Check and adjust carburetor. – At 600 to 1000 miles then at 6250 after that. (It should be done at all service visits.)
Check front and rear suspension articulated joints. – 600 to 1000 miles then at 25,000 mile intervals.
Check steering box and joints for play, check protection rack and rod ends, and drive shafts (lubrication). – At 600 to 1000 miles then at 6250 mile intervals after that.
Check and lubricate control doors, boot bonnet, and engine lift hinges at all services.
Check starter motor and alternator. Replace if necessary. – Every 25,000 miles.
Check air conditioning system, change freon and filter every year. Check oil compressor level. – Every 12,500 miles.
Check suspensions setting. – At 6,250, and then at 25,000 and 50,000.
Check seatbelts, seats, and headrest fastening and anchorage. – At 600 to 1000 miles and then again every 12,500 miles.
Check and tighten all nuts and bolts, in particular in connection with the exhaust system, all clamps also on the body. – At 600 to 1000 miles and then again every 12,500 miles.
Check headlight aiming every 12,500 miles.
Preventing chassis and body rust – Whatever that means – Every 2 years.
There are likely service bulletins which supersede some of this so check with your dealer for the latest information.