My average mileage is 8,500-10,000 miles annually. I replaced the brake master cyl, clutch master & slave cyls and clutch line right around 2 years ago so I'm due to flush the fluids now. The fluid levels are unchanged since then and there are no leaks so I'm not sure how air could have invaded the system but I guess I'll find out soon. Although fluids are nearly incompressible, I thought that a sponge effect could happen due to having 2 different sized molecules mixed together (oil & water). I may be wrong. 3 years ago I replaced the brake calipers with cross-referenced parts and am dissatisfied with their performance so I'll be replacing these as well. The pads are finally worn down as well. I change the oil every 3,000 miles. Since the engine only had 20,000 miles when I bought the car, I've decided to use synthetic oil. It's expensive but I feel it's worth it since the engine was low-mileage. I am at or near 20,000 miles since I replaced the ignition components. The Lambda indicator is due to trip soon as well. In 4 years of ownership, I spent 10 non-driving months performing many repairs to make the car road-worthy and 1 driving year replacing other 24 year-old parts as they failed (things I failed to consider during the initial overhaul) and have had 2 years of near-perfect reliability. I can't really complain. Rich A. #5335 >quote" You can no longer go by the service intervals that were recomended for a car that was to have been used for approx 10,000 miles a year. You now have to use time instead. Since most Deloreans now are used less than 2,000 mile a year I would suggest that you do a yearly service. It should consist of an oil and filter change, coolant test, under-chassis inspection, front end grease job, chassis lubrication, and full detailing inside and out. Every other year replace the coolant, brake, and clutch fluid. Every 5 years replace the wiper blades and the battery. Pressure test the cooling system. Every 20,000 miles (10 years) a full tune-up and replace the tires. To some this might seem like overkill but if you want the car to be reliable and safe and last a long time this is not so bad. The brakes do not become spongy from moisture. The water is a non-compressable liquid but it eats up the iron parts inside the system. Because the brakes are not used regularly and the brake fluid heated up to drive off accumulated moisture it is even more important to change the brake fluid often. If you pedal is spongy you have air in the system and it must be bled. If it keeps happening you will have to rebuild or replace the clutch master and slave cylinders. David Teitelbaum vin 10757<unquote" To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/