Do you actually wait for 100k miles before performing a tune up on your modern vehicle? The plugs, wires, etc being my concern. Air filter is as needed & fuel filter was done @ 50k.
61k on a non ecotec 2.2l 4 cyl. Also thinking about fluid & filter change for the auto trans.

I've been in the habit of trading vehicles about every 80,000 miles/4 years and haven't changed a plug in decades. I'd stick with the 100,000 recommended interval.

If in fact the maintenance schedule does call for 100K spark plugs, you're perfectly safe to follow it. Unleaded gas, electronic ignitions and better fuel/air control by fuel injection have greatly extended the lives of spark plugs. It would be an iridium plug if they can go that long. I changed my own plugs (also iridium/100K, coil-on-plug) at 105K and, honestly, they looked like they could go another 105. But I'd already bought them anyway, so no sense putting old ones back in. By they time your century mark rolls around, the spark plug wires will be stuck on and will likely get jerked out by the roots anyway, so put them on too. And put the same brand/type of plugs back in it, e.g., AC/Delco for GM, Motorcraft for Ford and so on. Your transmission fluid and filter change at 60K is cheap insurance.

~100k is a common first major service interval for stuff like plugs, timing belts, etc.

Transmission fluid tends to be more like 40k-60k

But there should be a service interval chart in your owner's manual, or at least available online.

I just follow that.

I will usually do it with the closest oil change to 100K just to keep it simple

This....however, not surprisingly, lots of people don't follow the factory maintenance schedule and then wonder why they have car problems.

quote:

Originally posted by RogueJSK:
~100k is a common first major service interval for stuff like plugs, timing belts, etc.

Transmission fluid tends to be more like 40k-60k

But there should be a service interval chart in your owner's manual, or at least available online.

I just follow that.

Absolutely not.
Cheap Insurance in my book.
Oil gets changed every 5k Miles.

Air filter every 15k Miles
Plugs done at 50k
All fluids done at 50k miles along with fuel filter.

Ford calls for oil every 12 months or 25% on the oil computer. Air filter 30k, and 100k for all the others.

I am in the process with my Expedition with 50k miles. Plugs are not called for till 100k but did them and they were ready. Had a slight miss and Factory gap is .032 all had expanded to .040 except the front two that were .042 and pretty heavy with carbon build. Granted I have a GDI turbo motor so carbon is going to be a larger issue.

Transfer case fluid was decently dirty. Brake fluid got done when the brake booster and master cylinder failed.
Life has not been cooperating so I still need to do the the front and rear diff, transmission, and fuel filter.

I will probably wait a bit on coolant as I am going to put the HD radiator in my rig so I will of course swap the coolant when I pull that. So no real need to do it twice as nope to get the radiator here in the new few months.

Plugs should last well over 100K BUT getting them out might be an issue the longer you leave them in. I've seen aluminum head threads get completely torn out when removal attempted at over 100K. Safest to let the engine cool overnight before removing also. Sometimes when they are warm they are super tight in the threads.

quote:

Originally posted by Black92LX:

Ford calls for oil every 12 months or 25% on the oil computer.

We have four Ford's in the family with the Intelligent Oil Life Monitoring system, I checked my manuals which I have in PDF form on my phone, and I don't see any reference to changing the oil at 25%. I looked at the manual for a 2016 Expedition on Ford's website and don't see it there either. For the Expedition, it says the monitor could go up to 1 year or 10,000 miles before it says you need to change the oil.

I change the oil when the computer says to. Everything else is by the book.

quote:

Originally posted by trapper189:

quote:

Originally posted by Black92LX:

Ford calls for oil every 12 months or 25% on the oil computer.

We have four Ford's in the family with the Intelligent Oil Life Monitoring system, I checked my manuals which I have in PDF form on my phone, and I don't see any reference to changing the oil at 25%. I looked at the manual for a 2016 Expedition on Ford's website and don't see it there either. For the Expedition, it says the monitor could go up to 1 year or 10,000 miles before it says you need to change the oil.

I change the oil when the computer says to. Everything else is by the book.

Sorry. It has been awhile since I have looked since I always do it at 5k.

That should be 5% according to the online scheduled maintenance sheet I have.

I have a maintenance schedule in my owners manual, yes. Unfortunately, there is about 45k of the current 60k that was not in my care and is basically a big ?
I still change oil @ 3k, so the factory maintenance intervals seem extreme to me I guess. Granted I started doing this stuff on cars that still had points ignition and carburetors(drive what you can afford), so tolerances were a little looser.
Plugs & wires looks like less than $40 if I go with Delco parts. Seems like cheap peace of mind, if it helps or not. Trans fluid & filter with next oil change most likely, as it is way past due.

I have 2 oil analysis reports from Blackstone that tell me that not only is my oil fine at 9500 miles but I ought to wait till I get 11500 miles. 5 liter in a ‘16 F-150, no makeup oil added.

I had a 2008 Expedition that called for 100k miles for the spark plugs. I had them done at 95k miles, it was amazing the difference in how (smooth and more powerful)the motor ran after they were changed, mostly at daily driving light throttle settings. I would say performance started degrading around 75k miles with the old plugs, but was so gradual you didn't really think about it.

What year/vehicle/engine do you have? If it's anything recent, changing oil at 3k miles is way overkill and I would follow the manufacturers recommended interval. New engines run much tighter clearances and the computers do a much better job at regulating fuel/air mixture and timing, and oil additives have come a long long way in keeping contaminents from getting in the oil compared to from the 90's.

Just did my second trans fluid/filter change on 15 yr. old Chevy truck with 130k on the clock. Perfect time for you to change yours. Not a fan of flushes.

Doing our Nissans now, both at 75k.
Thought about getting Iridium plugs instead of the OEM double platinum (NKG.
I went with the OEM Platinum's because I couldn't find any good redeeming reason to switch.
Did I make a mistake?

Also doing some Seafoam cleaning too.
I did my Titan and it did seem to perk up a bit.
YMMV

Vehicle is 01 Chevy, 2.2l 4cyl. Still the OHV design. I think 3000-3500 is in order as it usually looks like coffee coming out. Will stick to factory Delco plugs, unless there is a reason to switch to the new fancy stuff. Also saves like $3 a plug....

Follow manufacturers recommended schedule. For example, if you have a newer 2.0T GM motor, you have to change the plugs every 60k miles not 100k miles. But every car is different.

quote:

Originally posted by wolfe 21:
Do you actually wait for 100k miles before performing a tune up on your modern vehicle? The plugs, wires, etc being my concern. Air filter is as needed & fuel filter was done @ 50k.
61k on a non ecotec 2.2l 4 cyl. Also thinking about fluid & filter change for the auto trans.

See what owners manual calls for.

Besides fluids and filters, there is not a whole lot of maintenance needed on cars today. Most plugs are good for 100k now. Tradition wires have been replaced with individual coil packs, which only need to be replaced when there is a problem.

Brakes/tires as needed.

I'm pretty good about maintenance, although it is about time to change my plugs (80K). What I can't figure out though, is that in my '14 Mazda3, there is no transmission fluid to change. I even asked the dealer. It's a sealed unit. Very odd, at least to me.

I follow the maintenance according to my owner’s manual. The only thing I did different is when my truck hit 100K miles, I replaced every fluid. Owner’s manual doesn’t address things like brake and steering fluid so I went ahead and changed every fluid. Other fluids like transmission fluid and coolant get changed at the recommended intervals. For my truck, spark plugs were changed at 100K miles.