Snipped for brevity
Corect
Depends what you drive and what plugs it needs. Waste spark engines basically require double platinum plugs (they fire in both polarities) and 5.4 Tritons use a very specific specialized plug.
You don't have to. It's true -
My mini and my bug were run wide open almost all the time.
and the final drive gearing can be identical between engines - and if not the little engine is reving a lot higher. Gearing cannot change the power output - only the road torque. You trade rpm for torque by gearing.
But if loaded - BIG difference.
Load that 2.4 liter PT cruiser with 4 adults and luggage for a 3 week road trip - then drive it throgh the laurentians and back through the appalachians and tell me it's not working like a sled dog.
How about pulling a house trailer up 4th of july pass in idaho - something like 13 miles of 5% grade - or up the Coquahala at Hope BC.
They make a bigger difference on my bicycle which I tool around town on - - -
Just some touchup where the tinted clearcoat pealed on the 02 Taurus
Nope
Nope - not since replacing the heads on the 88 New Yorker 3.0 liter Mitsoshitty engine
Paid my brother to replace the clutch when I bought the truck because I was busy earning money
Nope - I paid to have my Haks and Michelins installed for the truck, and the Tiger Paws on the Taurus. Bought the used snows on rims for the taurus (virtually new)
Last one I did on my own car was the '81 Tercel. Haven't had a belt that required replacement since
Most people will never require 1,3, or 4 - and very few will require #6 either since so many have gone back to chains
Only do it if theyenjoy it - rather climb that mountain in the time it would take to do the repair - and do what you do well and get paid well for - and use that money to pay the guy who does that job well. Thats what keeps the economy going.
The actual economics / benefits are often less than you think when all is said and done - - - Break off a bolt or a spark plug (thinking Triton 5.4 here) and the cost goes WAY higher than paying the guywho knows to do it right in the first place - - - - -