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Comments
This should agree with your owner's manual
Got the wife a Altima last December and did the first oil change at 2.5k and now on the same schedule as mine.
When you can see the sludge in the oil, I don't mean the oil is dark but has some material suspended in it, how can running an engine with that be good? I don't and I've run many engines over 100K and I've never had any mechanical engine problems.
You can go the oil analysis route to extend oil changes but why bother (especially if you have more than one vehicle). Synthetic oil? I won't go there (see the synthetic oil forum).
If your average speed is 50 mph that's around 3,250 miles at 70 mph that's 4500 miles; if you are stuck in traffic for 1 hours only going 20 miles or if you crank a car cold and run for 15 minutes but only go 5 miles twice a day the 90 day change interval should be used even though you go only 900 miles as the moisture level in the oil would be extremely high!
http://www.noria.com/Learn/ler2.html
http://www.noria.com/Learn/ler13.html
My old mechanic, who was in the business for over 40 years before his retirement last year, always said a frequent oil change is the best insurance for a longer running car.
Lets look at that low price....
150,000 miles
3k changes = 50 changes at $25 a piece for a total of $1250.
7.5k changes = 20 changes at $25 a piece for a total of $500.
The difference is $750. Its a large amount of money to me. Its a car payment on a fancy car or 2-3 car payments on most cars. Or to look at it another way....any money you dont spend should be sitting in a money market getting 4-5% interest or paying off high interest debts (like a car loan or credit car debt if you have any). Essentially, that $750 looms much larger in that context and could be closer to $1500 in real savings if invested/used wisely.
Synth oil.....that another story. I dont use it but if I did my own changes I would but not for the reason that one would think. If I was using synth oil I would do 25k oil changes and just change the filter every 5-7k adding oil as needed. Even if you dont change your own oil, at $50 a change it still works out a couple of hundred bucks cheaper. Now if I was running auto cross, towing, street racing or something like that, then I would change more frequently but not for normal commuter use.
But wait!!! I dont claim that the 7.5k interval is better for the engine. Its probably not. What I claim is that in the lifetime of the average car (10 years) that it does not matter. Basically the 3k interval is a waste of $750-1500. Now if you change your own oil none of this applies becaues then the cost is insignificant.
I guess I must be crazy.
Also, keep in mind that when you change the oil at 3K, you or a technician is under the hood, looking around, noticing things. This gets more and more important, these periodic inspections, as the car leaves warranty.
So at a 180,000 miles I was going to have the timing belt replaced again. While they were at it, I was going to have the rest of the belts change (be 1st time). Was thinking about have the water pump changed (1st time) and the fuel filter replaced again (2nd time).
Your opinions on this? Is it necessary in your opinion? How much should all of this cost? I have a '94 Toyota Paseo and it will reach the 180,000 mile mark late this year.
Leo
If this did happen there is no evidence that the 3k interval would have prolonged it life. Even if there was sludge in the engine. That could be because the rings were bad to begin with, or did not seat properly, or it could be because the long oil change interval caused it. Without actually looking before and after, taking measurements, there is no way to tell. AND I guess thats my point. Engines fail early for a variety of reasons and crummy oil is one reason. I think a bigger reason is there was a screwup in the assembly process or another component (like coolant) failed first. In other words, within reason, the oil change interval makes little to no difference in extending engine life to 150k. I have not looked very carefully, but there is no evidence that (on average) the 3k interval is any better than the 7.5k interval for extending engine life (to say 150k). Most of the evidence seems antedotal. At least in case, my cars (5) have crossed 150k without engine incidents with longe intervals (unless I traded them earlier, 2).
I guess for people who dont periodically check belts, hoses, tires, and the like the 3k interval would help quite a bit. I do that kind of stuff myself which does more than 10 min (if that) a month per car. Also if someone wants piece of mind I guess the 3k interval is better. Me on the other hand: I would like to see some proof that it actually makes a difference before I spend the money. Any money I dont spend goes toward by Audi S4 Avant!!! In that car I will run synth and change 3-5k because I'm planning on driving the heck out of it and visiting red line frequently.
Leo
Thank you for your advice. Since I'll only be 20,000 miles away from a timing belt change, I've added changing the timing belt to the list. So, water pump, drive belts, and timing belt will all get changed. Already made the appointment. Your right in that it wasn't that more expensive. Thank you both, again. Much appreciated.
Leo
Last Monday I had tune-up, oil change and inspection and emission. This past Saturday, I had the drive belts, timing belt and water pump changed on my '94 Toyota Paseo w/ 160,000 miles.
Last May when I had a tune up done, the mechanic check the compression and said the pressure was low on one of the cylinders. He said that wasn't uncommon for a car of that age with that mileage. IT could stay that way for the rest of the cars life. Well, when I had the car in for the belt changes, the mechanic notice the head gasket had a small leak. Nothing that need immediate attention. He said that the head gasket could also last the lifetime of the car and not need repalce. Just watch the car's antifreeze level, especially during winter. To replace the head gasket I got an estimate of $1,000 before taxes. Obvisously, I will wait until it needs replaced. But what is your opinion on this? I'd like to keep the car for two more years if possible.
Leo
Mine look like a very minor leak. But I'll keep a close eye on the coolant, especially during the winter. You can't see the head gasket looking down from the top of the engine, and the timing belt cover also blocks your view. My Toyota has a plastic/rubber cover underneath part of the engine to sheild it so that obscures any visible leaks/drips, unless it becomes really bad. So the only way is gauge the head gasket is to watch your antifreeze level in the coolant container.
Leo
Leo
From these boards, Taurus transmissions do not have a great rep and www.lemonaidcars.com seems to indicate that some sort of owner satisfaction program/extended warranty may be offered by Ford. I'd hate to be done out of the cost of a transmission by this foulup...
Start by replacing the spark plug wires, which you probably damaged when pulling them off the plugs. Always rotate the boots to loosen them from the plug porcelain, always pull on the boots only, not the wires, and ALWAYS use some dielectric silicone grease inside the boots when re-installing if you ever want to get them off again in one piece.