jayhawkroy
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Chris, we have a 2003 and have exhibited none of the problems listed above. Have used the Subaru coolant conditioner from the start ($2 or less per bottle at dealer) and have had no problelms. Current have 126K on the engine. Timing belt should be changed at 105K, or not if you believe that a timing belt should be changed at the 7 year mark regardless of mileage. My next decision point for retaining this car is 150K miles. All said, I am not sure I would purchase a used Subaru unless very complete maintenance records were kept. There are too many variables and too many people who will (knowingly or unknowingly) short the car on maintenance and tire issues.
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I would get second opinion from an independent mechanic. His estimate should bring the price down even if all this needs to be done. Do you have any maintenance history for the car? Do you know if a tune up was done around 90K miles? If so, then the new plugs probably are not part of the solution. If you go ahead and change plugs, change out all the filters so you have a baseline on your maintenance items. If maintenance history is unknown, doing a full 90K service per the owner's manual would be in order, too. Valve cover leakage could probably be dealt with later -- I have difficulty conceiving of a situation that in would negatively influence your idle and engine performance.
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Follow the maintenance schedule in the owner's manual and you'll do fine. I would check brakes and tires if you haven't already done so. 90K service and the timing belt change at 105K are your next two big events. Verify that the previous owner actually accomplished the 60K service, and get it done if it wasn't done.
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For oil drain plug, I change out washer at 30/60/90K service. For AT, think it will get changed out at about 120K. I do this mostly as a preventive service (never had an old one leak, either), because the crush washers are about 87 cents each at my dealer. Have seen them cheaper on the internet, but wasn't ordering enough to justify shipping.
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I used standard Mobil Dexron III ATF to change out our 03 Legacy wagon at 30,000 mi. Did not change the AT filter because owner's manual says it is not necessary so long as there are no leaks or other work to be done on the AT. I got 4 out of 9.8 qts out for each drain, and drained it twice over about 1000 miles. Am planning on changing out ATF about every 30K miles. With this schedule, I don't see the value in using synthetic.
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According to the info at Bobistheoilguy.com, there are three manufacturers of SuperTech dino oil: Warren Performance Products-Omaha (midwest), ExxonMobil (east coast, looks like a Mobil bottle), and SOPUS (owners of Pennzoil and Quaker State), mostly west coast. Suspect you are getting the WPP stuff, as we do here in Kansas. While you are at Walmart, recommend looking at Phillips Trop-Arctic at $1.24-1.28 per qt. It is a dino/synthetic blend at a fairly inexpensive price and is SM rated.
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As far as AT fluid goes, you never really said if you had checked the AT fluid level or not. I would do that immediately and put in any make up ATF needed until you can change it out. At the same time, check out the color of the ATF. Red is good, brown means change out soon. If your Impreza is like our Legacy, ATF change requires only 4 quts for drain and fill, because only about 40% comes out. Dexron III runs from $ .80/qt at Costco for Mobil to about $1.22 for Supertech at Walmart. Cheap insurance. Do a drain and fill ASAP if you have been neglecting your maintenance. $5 buys you a lot of quality maintenance for an AT. Do a second drain and fill about 1000 miles after the first one if your current fluid is really brownish. Continue a third time if needed, until you get a good red color. If you think you have water in your gas, run some gas dryer chemical like Heet through the gas tank. Follow up with an injector cleaner like Techron in the second tank of gas. By all means get the fuel filter changed. My personal opinion is that Sam's gas and Wawa's purchasing strategy is to buy from the lowest bidder, so one is not superior to the other. Wawa is not one step up in quality from Sam's, but kudos for going to 93 octane for the next tank. If I have gas problems like this, I switch to a Top Tier gas or a known brand name for a while (purchasing from a high volume dealer is a plus). If your performance changes, then you know to quit buying Sam's gas. Top Tier designation gives you at least a level of security due to the fact that Top Tier gasolines must have been tested to meet a specified standard. It would also be helpful to tell us how many miles are on your Impreza. That will help focus on your most immediate maintenance needs....Roy