To me if should be more geared to indivual driving conditions and much more geared to the indivual buyers locals and the temperatures and enviromental conditions and how much a driver uses etc the vehicle. For example you drive daily in the city and rarely on the hwys that would mean you probably even start your vehicle more besides the extra carbon build ups etc.You drive it say and use it alot running low on gas that would require atleast running some kind of Lucas or STP etc fuel treatments regardless if you only drive hwwy but you've run low on gas a lot due to gas prices etc.
So you need to think about things like has it ever over heated on you in the past or have youve driven on rough city roads etc and it might require frontend work or balaning of tires , air pressure checked , 4 wheel alignments.Even if you dont drive on rough roads etc still any vehicle that age is due for a 4 wheel alignment or atleast to have the specs checked out but remember proper tires and air pressure and balancing of tires etc doesnt just help the ride of gas mileage its vital when get the wheels checked for alignments too.
It's not easy to just go by some owners manual bec to me cars dont maintain themselves and each car wears differently etc due to driviers or driving conditions or weather conditions etc.
What I'd do is be sure you change the plugs wires and then clean the ignition module with a wire brush , sandpare but wipe or brush the sand away later. Most don't do that and really in 4 to 5 yrs and even a few months those ignition module wire connectors can corrode or rust etc.Don't forget to use the special lube that comes with new wires bec that helps block moister etc and stops or is good in preventing odd idling or rough idling etc especially when moist or damp or wet outside or extreme cold temperatures etc.
If you want a suggestion about plugs buy a new set but check the spark gaps bec they can be wronly set by the manufactures.When dealing with the fuel system I really do suggest that that use something like STP etc and change the fuel filter later after you use a few tanks of gas up but be sure you also go for hwy drives in it when you do the treatment thing.
I'd go over all belts , hoses , rad , and fluids be sure that no leaks are present and be sure that the coolant is tested via a antifreeze tester and its level checked.
There is a good chance especially if you live in a extreme temperature local that the grounds under the hood or the connections in the charging system might be corroding or rusting etc and its not a bad idea to clean them too but if any radio or security access codes needed for that vehicle to start once battery is disconnected etc then be sure you read the manual and have ifo handy etc.
You'd be surprised in just how many ppl end up in the long run buying or replacing parts one by one in the charging system like battery's then starters , then alternators and at times more then one their replaced all due to rust or corrision or bad charging system connections causes accessive strain on them.
Bec it's Dodge I'd again take care of the grounds etc and I might wish to perform a transmission fluid and filter change on it too and it not hurt to check into if any recalls or service bulletins or flash updates via dealerships.
Hope that helps and best of luckBy the way I'm not suggesting not to go by the owners manual just saying at times if you want to keep any vehicle for awhile more and its got such mileage on it , its not a bad idea to change oils a little more often then suggested and do things like filters on transmissions or timing belts or chains etc a little before hand but mainly if you drive it a lot then its another reason to up the schuled work too.plugs every 30000 miles, the wires on those cars give you problem after 50000, do both. Fuel ffilteris part of the fuel pump, drop a can of fuel injector cleaner in a full gas tank, Get some good wires, $50 at the dealer, and do not put fancy spark plugs, is a waste of money, use the recommended Champions, get a six inches extension, a spark plug tool (better with a swivel) 5/8 inches, and you are in bussiness, good luck
