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Old 06-06-2011, 11:54 PM   #1
sirhawkeye
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optimal maintenance intervals for 2010 Focus?

I know the manuals say that the trans fluid doesn't need changing (at least, I never saw an interval for that). What is the most common interval to change the transmission fluid, timing belt, and spark plugs on the 2010 Focus?

I think the spark plugs may be 90k, actually, but do people generally change them sooner than that (maybe around 60k)?

My biggest concern is the trans fluid and the timing belt.. Spark plugs aren't that big of an issue to me because when they go, you'll notice. With a timing belt, there generally is no warning signs...


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Old 06-07-2011, 02:31 AM   #2
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It's a timing chain and in theory it should never need to be changed ... however there might be chain guides that will. Generally the chain slides across a plastic'ish surface, if the surface becomes dry the chain can mar the surface and leave slivers in the oil pan. Also one guide acts as a tensioner, there's an oil pressure driven servo to keep a constant pressure or a spring. Not sure how exactly Ford did it though.

The trans, take your best guess ... pretty much when ever you feel like doing it.

Same for the plugs. But do not that the longer you wait with plugs the greater the chance of galvanic corrosion, steel plug in Aluminum head.
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Old 06-07-2011, 03:52 AM   #3
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I beleave the trans is a 30k service
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Old 06-08-2011, 01:15 PM   #4
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Hi everyone,

According to the scheduled maintenance guide, the spark plugs recommended replacement is at 90k. The transmission fluid is recommended at 150k.

Additionally, you may visit FordOwner.com at your convenience, if you have not already. This site will provide the maintenance schedule, as well as quarterly service offers from your preferred servicing dealer. Hope that information helps!

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Old 06-08-2011, 01:26 PM   #5
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The stock plugs are a platinum type and usually good for around 90k as long as there aren't any oil control issues leading to deposits on the plugs. I would definately at least remove them and put some anti-seize on them for the reasons iminhell mentioned. Aluminum and steel + heat doesn't work out very well for long periods without it.

Trans fluid should last a long time. I usually do mine every 30k because im anal. At least inspect it every 30k. If it looks dirty, then change it. It takes quite a while to break down and get dirty.
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Old 08-09-2011, 12:26 PM   #6
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have you replaced the plugs yet, did you or would you go with OEM or what brand would you use?
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Old 08-09-2011, 08:20 PM   #7
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I asked my dealer the same thing and they said , that 2008 -2011 ford focus has to only be INSPECTED every 30,000 miles. in order to change the tranny filter you have to break open the tranny case, not just take the bottom pan off. said it was a pretty complex job. so i said so what your saying is it doesnt need to be changed. they said yes , unless ofcourse its burnt or dirty or somthing.
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Old 08-09-2011, 08:36 PM   #8
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Yes, but from what I've seen, at around 90k (unless you've changed it prior to that point) most trans fluid will be dirty and brown/very dark red and ready for a change.

And then there is the old concern of sometimes changing the trans fluid if real dirty can actually cause more problems than just leaving it well alone. At least, that concern applied to cars 10-15 years ago... car's today are probably much different and can handle more "abuse." I mean, I've seen instances (way back when) when trans fluid WAS the problem.

On my 2008, I had it done at 60k. Fluid only. The plan was to do a filter and fluid and 120k, but sold the car before it hit that point.

The problem is that if you let the car go to 90k without a fluid change, it's not under warranty, so in a way, this is sort of a gamble. Now, the counter argument is that you'd be throwing money a way if you did it at 60k because it's not needed. OK, but how much does a new trans cost? Probably more than all of the fluid changes combined that you would do for the trans over time. That's sort of how I see fluid changes. I always tend to follow the "Severe Conditions" route with maintenance schedules. I figure it's a bit more money each time, but in the long run, it may end up saving me some money...
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Old 08-09-2011, 08:38 PM   #9
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I vote for Autolite spark plugs... they are just like the OEM and easy to have. Irridium are the MOST DURABLE, but Double Platinum is what I usually run with.

A good oil and change schedule will preserve a timing chain..
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Old 08-09-2011, 08:44 PM   #10
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The timing belt and spark plugs I'm not that worried with... last I checked, Ford doesn't use interference engines, so a broken belt (from what I was told by my dealer) is not like it is with other companies that use them....

As far as I'm concerned, I'll just have the belt replaced at 90k with the plugs and other stuff. I personally think 150k is too long for a rubber belt, even if it has steel reinforcements or whatnot.

Ford's water pumps in the Focus don't have to be replaced when the timing belt does, do they?

I know in my Honda, that was the general practice since a lot of cars with timing belts use the belt to run the water pump, and it ended up being a more cost effective way to go--versus waiting and then going back in again after the new belt was installed. I just figured that while they were in there, for an extra $$$ for the pump, it would be cheaper than letting it go and possibly crap out a year from that point... sort of as preventative maintenenance.
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