Hi everyone and welcome back to the Sawickipedia. Today we're gonna be doing an
engine oil flush. Now a few things to note before we even get started,
most modern engine oils don't really require flushing the engine. Oil these
days is designed to suspend any sludge or build-up within the oil itself. Out of
curiosity we're going to do a flush today on this car here, it's done
250,000 K's which is about 150,000 miles in the old money,
and we're gonna see what the results are. There's gonna be some samples taken,
we're also gonna remove the valve cover and have a look inside there both before
and after. So the reasons you may want to do an engine oil flush is if you've got
sludge buildup or if you've got some low oil pressure warnings from your ECU
then this may help relieve those kind of things,
but there's also a bunch of reasons why you may not want to do a flush. The main
one being if you loosen up that sludge you've got the potential to get
it either clogged up into your oil galleries which is gonna cause major
damage if that oil is not flowing through where it should be, or otherwise
you may remove some sludge that was potentially holding a seal together or a
gasket together. So taking away that sludge may cause an actual oil leak but
either way we're going to find out. I'm not too worried about this car so
if we do break something or kill it at least we know not to do it again. I'm
gonna remove the valve cover just to see what the engine looks like now and then
we're gonna warm it up for about ten or fifteen minutes and then we'll take an
oil sample of the current oil. Now the current oil is done about twelve hundred
kilometres which is seven or eight hundred miles.
So we'll take a sample of that then we're gonna add the flush fluid, I
just picked up whatever was on special. So we'll try that out,
add the flush fluid, run the engine again for the ten to fifteen minutes -
whatever it specifies on the fluid itself, and then we'll dump all that oil,
I'll grab another sample of that oil as we go, and then after
that I'm actually gonna fill it up with just some cheap oil that I had
laying around just to sort of really flush out all that flush fluid and
anything else that may be in the engine. So I'll add that, we'll run the engine
again, and we'll dump that oil. I'll also grab another sample there and then
finally we'll change the oil filter and just put in some more cheap oil that was
on special and then after that we're gonna run that for another
twelve hundred kilometers just so it's at the same sort of age as the current
oil that's in there, and then we'll take another look inside the valve cover and
just generally see how the engines running - if it is still even running at
that point. But that's what we're gonna find out so let's take a peek. So all in all
that actually looks quite clean, there doesn't seem to be any massive buildup
and actually this gasket looks fairly new so I daresay that was done recently.
Just get you a bit closer, so everything looks quite clean in here but anyway
we'll do the flush and see if we can notice any difference but unfortunately,
well fortunately and unfortunately this engines a bit cleaner than I
expected. There's a bit of crap on there, but it looks quite good, anyway
maybe the crap down there. So that's what it looks like before the flush.
13 degrees (c), so we'll give it 10 minutes, I'll leave the microphone here
so we can have a listen over that peroid.
Glug-glug! It is very thin, looks like water.
Once again I'm gonna put the microphone up near the engine,
and I think we'll run it for 10 minutes given that the engines already warm.
All right we'll get it back up and grab another sample of the oil, dump the rest.
Right so now I'm gonna add the oil that I just had lying around just to sort of
really flush everything out. I'll go for a drive and really vary the load and the
RPM just to get it all through the engine and then we'll dump that out and
put in our fresh oil and a new filter. The engine is cool again so it's
probably only about ten degrees again, so we'll just do another listen as the
engine warms up see if we can spot any differences.
Okay so as you could hear that 10W40 really sort of... you could really hear it
flowing around the engine. It did originally have 15W40 so that's what
I'm gonna add for the next 1200 K's just so we have a decent comparison
between the original oil and the current one, and yeah like I said we'll have
another look in 1200 K's and see what the engine looks like, if it's still running
at all. So I'll put this new oil in and we'll warm up the engine again, I'm just
gonna let it cool completely, and then we'll warm it up until it reaches
operating temperature, and we'll have another listen to the engine and see if
it sounds any different this time.
Alright so the engines now cold again, I'm gonna leave the microphone here so
we can have another listen.
Alright so there we go, the current oil is now in there. It definitely seemed a
lot quieter than the previous round which was just after we did the flush, so
we'll see how it goes for the next 1200 K's and we'll come back and take a look
and see if the engine is still actually running. But before we do that we'll go
and have a look at our oil samples. Okay so here's our oil samples - this is before
we added the flush fluid and there doesn't seem to be much in there, in fact it
looks like there's an eyelash in there but that's probably not from the engine!
It moves around a little bit but looks fairly thick. This is the engine oil with
the flush fluid in it, so it looks like pretty much everything is completely
drained out of there and it might be a hint runnier,
but not by much. Next up we have just our clean oil so it's just a bit of
an idea of what it looks like after we ran the flush, and this is the clean oil
after 20 K's, so i went for a drive for about 20 minutes and tried to vary the
load quite a bit, and yeah it also looks quite thin but given that it's a
different oil from what was originally in it that may explain why you could
hear a lot more of that oil moving around inside the engine when we ran it
before, but obviously running it this time it didn't sound anything near as
menacing. So that's about it for now, obviously check back in a couple of
weeks time as we'll have some more results but until then be sure to hit
subscribe and hit that notification button so you get informed when that
video comes up. But until then we'll see if this thing actually lasts another
1,200 K's! At this point I wouldn't recommend anyone doing an engine oil
flush simply because it doesn't really seem to do any good
from what I found. I mean it may obviously differ with an older engine
that's possibly been running a lot older oil and had a lot more build-up but on a
modern engine with modern oil like I said at the start - they're designed to
suspend any sludge or anything within the oil so it all comes out when you're
doing oil change. So as long as you're regularly doing an oil change there's
not really any point in doing this, but as I said this is more just to see what
results we'd have using this kind of stuff. As always thanks for watching the
Sawickipedia. Definitely leave me a comment down below if you think there's anything
else that I should look at but until next time - see ya later!