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How ofter does one have to change the rear differential oil in a 1997 Ford Aerostar extended 4.0 liter automatic?
Wiki User
∙ 15y ago
The Ford 1995 Aerostar Maintenance Schedule said that it must be every 100,000 miles (160,000 km) of if the axle has been submerged in water.
Haynes Aerostar manual (2004) says you should check the differential level every 12,000 miles or one year. They say you should change the oil every 30,000 or 30 months. Unless, again, if the axle has been submerged.
A gasket costs $3 to $8. The oil cost me $4.40 for a quart bottle. I don't see any reason to get some sort of pump to extract the oil; taking off the cover is easy and the bottom of the case can be wiped to remove any metal chips.
Hint: To pry off the cover, don't start with a screwdriver. Use a couple butter knives to break the seal at the bottom and open it enough for a screwdriver to wedge it open.
Hint: The quart bottles were quite adequate for squeezing the oil in but enough oil remained in each bottle that I needed an extra one or I wouldn't've gotten the last pint in. I subsequently drained all the partial bottles in one bottle which I keep for occasional lubrication. Hint: Look at the sticker inside the door frame on an Aerostar. Look for "TYPE AXLE". If this all numeric then this is a conventional axle and most any 80W-90 will work. If it starts with a letter such as in my axle, a B4, then it is a limited slip differential. The owner's manual and the Haynes manual have no mention of this. The Chilton's manual gave only a hint. You have to look up your axle on drivetrains.com to find a table of Aerostar (& other Ford truck) axles.
Wiki User
∙ 15y ago
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