Preventive maintenance is one thing - fussing is another. I constantly inspect all my cars and if anything, I over-lubricate considering I only put just over 6,000 miles on the TR6 in the 16 years I've owned it. I replaced a couple of hoses and the fan belt. I've continually maintained and upgraded the car - but - once set up and running fine, I leave it alone unless there's a problem. Compared to the MG TDs I owned back in the day, these TRs are very reliable. The only ignition trouble I ever had is when I tried to "upgrade" and installed electronic ignition a few years ago. When it continually cut out in hot weather, I sent it back to the factory for testing. They told me it was perfect and sent it back. I re-installed it, and it cut out again on an August day. I dis-installed it, replaced the points and have had no trouble since. When one carb began dripping fuel, instead of panicking and tearing apart the carbs, I rapped the float bowl with a screwdriver handle a couple of times and the drip stopped - permanently. I've found these Su/Stromberg carbs to be very reliable - if you leave them alone and stop fussing with them, lifting the pistons, fooling with the jets, taking off the domes, etc., etc. Just make sure they're pulling equally ( a stethoscope works fine), top off the oil once in a while and leave them alone. If trouble develops that can't be fixed with a screwdriver rap or some oil, then you can have them rebuilt.