Doesn't matter if it's diesel or petrol - any turbo will thank you for
letting it cool down a bit before switching off.
With modern (modern? Well, the last 20yrs or more...) water-cooled
turbos, though, it's much less necessary than it was in the early days
when they were cooled by oil alone. All you really need to do is not
thrape the living arse off the thing and immediately switch off.
I suspect the turbo in his Mazda was probably replaced for reasons other
than having been "cooked" - modern turbos are bloody complex, with the
vanes varying in angle to minimise lag and maximise throttle response,
and - especially in diesels, with all the soot in the exhaust (before you
get to the particulate filter, remember), they can easily clog up.
using good quality fuel and having regular oil changes using the right oil
is more important than ever. It is never worth turning off an engine for
less than a few minutes unless the car is unattended.
Obviously, I was referring to the vast majority of conventional vehicles.
I was thinking more of starter wear and the initial rev up that most
vehicles do, obviously hybrids such as the prius stop and start themselves
as they need, however the prius at least does not have a normal starter or
even a conventional cycle engine, it also keeps itself warm using a thermos
flask (don't laugh, they do) and of course is designed for those exact
Wheras BMW & VW just bolt it onto the standard engine. Starter wear's the
only real issue, & unless something else is faulty that should be
negligible on a warm engine. Why rev it up when you start it?
What would you class as good quality fuel and how would you say
what was good quality. A modern Vauxhall turbo diesel can happily
run off Kerosene or heating oil as it is bought to avoid duty. This
causes no harm to thousands of lease cars!
Using different brands of diesel available to the public will not be
noticable. Using red diesel or bio diesel can ruin the engine, fuel pump,
seals and god knows what else as it's not meant for a car engine.
Biodiesel is misleading, there is no real standard, similar to people
running a car from used vegetable oil.
Regular servicing is important. Oil change and filter change very
important more frequently on a diesel turbo.
We were somewhere around Barstow, on the edge of the desert, when the
saying something like:
Utter shite. 28second kerosene will shag the pump in short order. Gas
oil (marked diesel as heating oil) is ok, but is usually pretty manky.
Many farmers combine the heating oil and diesel tank with that in mind.
Utter shite. There is a standard and most commercial producers stick to
it. Backyard Biodiesel is a different story, but it's never caused me
any problems in the thousands of litres I've made /used of it, because I
take reasonable care when making it.
Want to demonstrate your abysmal ignorance any more?
Certainly the usual cause with a VAG turbo-diesel turbo failure is a
sooted-up VNT mechanism...
...and it seems that the best way of avoiding it is go give it some boot
once in a while to help clear the crud out.
I certainly wouldn't stop the engine for a very short stop, and as
Adrian says, thraping the nuts off it and stopping is asking for it.
There is no reason to leave the engine running on any turbo car.
What you must do is allow 30s at idle if driving like a lunatic, or
slightly longer after a super high speed motorway run. The turbo
stays spinning for a while so it's best to have oil circulating around
the bearings whilst it slows down.
You often need to leave it for longer on a petrol turbo engine due
to the higher speeds the turbo runs at.
If you're looking for someone to back you up, I doubt you will
find anyone if they know about diesel engines.
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