This may be a completely stupid question about car engines but hear me
out. If I buy a brand new car, the engine is mint and purrs
wonderfully and then after a few ten thousand miles it starts to sound
a bit gruffer a bit less responsive etc. so my question is what is it
that is wearing out in the engine and would it not be possible to
replace those parts?
I drive a honda that I bought second hand a few years ago and now it's
like 70k on the clock and it drives nicely but I'm sure brand new the
acceleration would have been that much sharper, the braking would be
tighter, the engine sound would be a bit more grrr and a bit less
'gurgle'. So what is the difference between a brand new engine and one
that's done 100k - apart from the dirt and grime?
Oh and seperate to that, does anyone know any good websites that tell
you how long a Honda Vtec 2.0i petrol engine can last if well
All parts that touch and/or move wear, clearances get bigger, remnants of
combustion build up in the engine and bearings, dirt builds up underneath...
You can replace every single wearable part if you want to.
if the oil is correctly changed , you use good fuel and have all the
servicing done right then most engines go a little better when they have
done some mileage. the principal cause of engines losing power with age is
wear leading to lower compression, less valve lift etc.(largely held at bay
by good oil change regime), secondary losses will be coke build up.(held off
by good fuel.)
A strip and rebuild to new specs will cure almost any worn/dirty bits and
restore correct performance.
Correctly looked after a Honda engine will easily exceed a quarter of a
million miles with very little loss of power
I'd go along with that. The moving parts in a new engine are sliding or
rotating on newly machined surfaces. The friction between those moving parts
is likely to be greater than it is after the surfaces have 'bedded' into
Modern engines do not need as much 'running in' as they used to, because of
improved design, materials, and more accurate machining, but they still
benefit from being carefully treated for the first few hundred miles.
IMO how they are treated during that runninng in period can still have a
significant affect on their life, and how well they perform during that
Assuming of course they are also regularly serviced.
the principal cause of engines losing power with age is
I would expect that to be true for most engines, but obviously some are
better designed than others.
Which, nowadays, means far more frequently than the manufacturer's
The schedules are set to give low costs for the fleet first buyers, and
sod the person who ends up with it 10 years down the line.
Having said that, how many cars die these days because the engines are
worn out? Next to none. Ignoring collision damage, most scrappage is
because of a pile of small niggling faults - or even maintenance items -
costing more than can be logically spent on the car.
Agreed, with the possible exception of some VAG lumps with high oil
consumption as standard, and the smaller Zetec ones that shatter their oil
control rings if thrashed from cold.
The AA is seeing increasing numbers of cars killed by simply having no oil
Nope; some people just shouldn't be allowed to own a car!
Often, hapless young women whose Fiesta engine has seized solid will openly
admit to never having opened the bonnet. They will then become agitated
because the patrol "won't" fix the thing!
Not a chance! That doesn't stop it going along, does it?
One young person that my AA patrol contact dealt with recently had run a
Fiesta out of oil. He offered to run her to a garage to get some oil, on
the off-chance that it might have survived. (It hadn't.) She was indignant,
as she had just paid for an MOT the previous month, so thought it was the
garage's fault! She honestly and genuinely believed that all she needed to
do to maintain her car was have it MOTed each year. She thought that was
what "servicing" was!
I blame whoever taught her to drive...
You would really be amazed at the actions and inactions of the general
Why did they do that? Or did you mean it was an unintended side effect?
Many VAG cars can use one of two oil grades depending on the type of service
schedule chosen. I wonder if there is a difference in consumption between
I've never needed to use a single drop of top-up oil in any Zetec engined
car I've owned over the last 14 years, but I still check at least every
fortnight. On the odd occasion when I've had a hire car, I always do the
under bonnet checks. I also do it if I borrow a car from anyone. It's so
simple I can't understand not doing it.
Oddly enough I was just thinking about this the other day: my thoughts
were: how long is it since I replaced a set of big end shells or rings?
About twenty years !! before that it was not uncommon to freshen up an
engine, never happens anymore.
Any proof of this? Have you had oil near the end of the service interval
analysed to check on its condition? Or is this merely a gut feeling?
Because I've heard this said each time service intervals are extended - I
can remember when they were only 3000 miles. And engines wore out at
Given my car uses oil at 12 quid a litre I'd expect it to have some
advantages. Oh - many makers include servicing during the warranty period,
so that makes no difference to fleet running costs.
When a car gets old many simply ignore routine servicing altogether. Hence
speeding up the inevitable. But I've yet to see any definite proof
changing engine oil early makes an engine last any longer.
*What boots up must come down *
Dave Plowman firstname.lastname@example.org London SW
There are those who suggest driving *very* strongly for the first 20
miles to ensure the piston rings bed in properly before the honing
pattern wears off. A quick google returns things like this:
http://www.pumaracing.co.uk/runin.htm (local boy gets top result from
Google - good work Dave!)
On Wed, 05 Mar 2008 10:25:18 +0000 (GMT), "Dave Plowman (News)"
Are you saying that the honing pattern hasn't worn off as it should?
Has the honing pattern became permanently glazed, is the pattern too
severe or are your piston rings not touching the cylinder walls?
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