How many miles change the filter and trassmicion oil

if you are talking about sludge and the like
use diesel engine oil --say --shell rotella 20w40 as the engine oil( same oil but with more detergent additive )
change the oil filter around every 1000 miles for starters can block easily and the oil every 3000 miles for the first 10000 miles after that oil change every 5000 miles along with the filter change

Some people change oil at 3000 miles,most people don't really care or keep track
I would say 3 times a year,if you drive less than 10,000 per year
4 times a year ,up to 20,000 miles per year driven
Use at least semi or full synthetic oil

It's listed in your owner's manual. Schedule A is normal driving conditions.
SCHEDULE "A"
7,500 miles (12 000km) or at 6 months
- Change engine oil.
- Replace engine oil filter.

15,000 miles (24 000km) or at 12 months
- Change engine oil.
- Replace engine oil filter.

22,500 miles (36 000km) or at 18 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

30,000 miles (48 000km) or at 24 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Drain and refill automatic transmission fluid and filter (4.7L).

37,500 miles (60 000km) or at 30 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case fluid.

45,000 miles (72 000km) or at 36 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant at 36 months, regardless of mileage.

52,500 miles (84 000km) or at 42 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if not done at 46 months.

60,000 miles (96 000km) or at 48 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary (5.2L/5.9L).
- Drain and refill automatic transmission fluid (4.7L).

67,500 miles (108 000km) or at 54 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

75,000 miles (120 000km) or at 60 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

82,500 miles (132 000km) or at 66 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.

90,000 miles (144 000km) or at 72 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Inspect front wheel bearings.
- Inspect brake linings.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

97,500 miles (156 000km) or at 78 months
- Change engine oil.
- Replace engine oil filter.

105,000 miles (168 000km) or at 84 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

112,500 miles (181 000km) or at 90 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.

120,000 miles (192 000km) or at 96 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

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As a rule of thumb, oil and filter every 3000 miles, air filter everyt 20,000 miles, transmission oil every 50,000 miles and spark plugs every 80,000 miles.

If you drive normally then change your oil/filter every 5,000 miles. If you drive mostly city driving change it every 4,000 miles. If you drive mostly highway then change it every 6,000 miles. If you are using a synthetic oil then add 1,000 miles to each of these intervals. Use the correct weight oil for your 1997 MPV as listed in the owner's manual. Also use a quality filter such as Purolator, Wix, or Bosch. Change your air filter every 30,000 miles unless you drive in dusty conditions and then change it more often.

Yes it makes a difference. You can never go wrong following the manufactures recommendations in your owner's manual. Saying that, I recommend every 5,000 miles if you use conventional oil and every 7,000 miles if you use synthetic and drive normally. If you drive mainly highway driving you can extend these 1,000 miles. Just as important is to change the filter at every oil change and to use a quality filter such as Purolator, Wix, AC/Delco, Motorcraft, or Bosch. Avoid cheap filters. Also important to a clean engine is to change the air filter every 30,000 miles.

The average oil change is every 3,000 miles

If you are a normal driver then I recommend you change your oil/filter every 5,000 miles if you are using conventional oil. If you are using synthetic oil then change every 7,000 miles. Just as important is to use a quality filter such as AC/Delco, Purolator, or Wix. On your GM vehicle I would use an AC/Delco filter. Another very important filter is the Air Filter. Replace this filter every 30,000 mile unless you drive in very dusty conditions, and if so every 20,000 miles.

check your owners manuel..if you have none than purchase one.
I would say leave them alone .

Does not have a heater fan filter, only a air filter,oil filter and a trans. filter. oil filter change every 2500 to 3000 miles- air filter depends upon driving conditions it should be inspected at time of oil change- and trans. filter changed every 30 to 35,000 miles