Using compressed air while changing engine oil
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Veni, Vidi, Posti
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Thu Apr 09, 2020 7:23 am quote
I have watched a few YouTube videos. Some folks are using compressed air after draining the old oil.

So with the oil filter off, the oil drain plug off, compressed air would be introduced into the dipstick hole to get the last little bit of oil.

It makes sense but I never heard such a thing done on a Vespa.

Is this a good or a bad idea?
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Thu Apr 09, 2020 7:26 am quote
With my luck everything in the vicinity would be splattered with oil.
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Thu Apr 09, 2020 7:29 am quote
I wouldn't do it because of the condensation normally found in my compressor tank. I wouldn't want to force any of that in to the motor.
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08 LX150
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Thu Apr 09, 2020 7:30 am quote
Sounds like a mess, and unnecessary besides.

You try it and tell me how it works out for you.
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Thu Apr 09, 2020 7:37 am quote
Sounds like an overkill approach to me.
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Thu Apr 09, 2020 8:04 am quote


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Thu Apr 09, 2020 8:08 am quote
If you leave the drain plug out for an hour or so all the oil that can drain out will.
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Thu Apr 09, 2020 9:40 am quote
Sure seems like a lot of hassle and a huge mess for relatively little gain especially when many people have shown that regular oil changes can keep Vespa engines running strong for 100K miles or more. Just sayin'

Best
Miguel
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Thu Apr 09, 2020 10:15 am quote
What Miguel said. If you think about the amount of oil you may get out with the compressed air, I would suspect it is a very small amount. Compare that with the amount of new oil being put back in, I doubt that makes any bit of difference in the new oil.
Hooked
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Thu Apr 09, 2020 11:17 am quote
I donít think that is necessary.

But I do know guys that leave the drain plug out overnight when they change their car oil.

I just leave the plug out as long as it takes me to pull the filter. Not much draining out by then.

Bill
Veni, Vidi, Posti
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Thu Apr 09, 2020 11:24 am quote
italianmotofest wrote:
I donít think that is necessary.

But I do know guys that leave the drain plug out overnight when they change their car oil.

I just leave the plug out as long as it takes me to pull the filter. Not much draining out by then.

Bill
Overnight? I'd be worried about bugs and spiders crawling in there. And dust, or a virus or something. My scooter could catch cold!
Veni, Vidi, Posti
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Thu Apr 09, 2020 12:15 pm quote
Thank you for all the replies. I am convinced not to do that.
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Fri Apr 10, 2020 4:07 am quote
the idea would be to get a bit more dirty oil out. what works far better is flushing engine with an inexpensive oil before filling with the good stuff.. but this should only be considered if oil is extremely black and dirty.
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Fri Apr 10, 2020 4:20 am quote
For forty-five years I have changed the oil on my motorcycles and scooters that I have had and I have always used the good old traditional method, I take a day's time, I go to the garage, I turn on the radio, I prepare the tools and materials.
I take the container for the old oil and put it in position, I remove the cap on top and I remove the cap on the bottom ...
While the oil drains I turn on the coffee machine and with the cup nearby I read the newspaper or a book; after about an hour or more, I take the filter cap (in my scooter I am part of the drain plug) and rinse it in gasoline and put it to dry. I sit down and continue reading and after about half an hour I put the filter and cap back in place.
I take the new oil and pour it into a graduated container (900 grams) with a spout and put it from above, screw the cap with the stick and check the level.
This is the advantage of changing oil once a year or at the distance intervals recommended by the manufacturer, no dirty or excessively degraded oil.

There is no other ...
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Fri Apr 10, 2020 4:53 am quote
On MC's & scoots- I warm 'em up, drain by letting them sit overnight and drip off. Never heard of blowing old oil out? but gravity is real handy.
Spiders, come on?
Hooked
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Fri Apr 10, 2020 5:09 am quote
Warm engine, drain oil, wait for the drips to stop, proceed. Any time spent over 15 minutes is purely psychological.

The only reason to be concerned about spiders is on a humanitarian basis. A greased spider carcass will pass unimpeded through any engine pushing, what, 30-50psi oil pressure, and be picked up by a filter. It certainly wouldnít score a cylinder! Perhaps a future episode of Mythbusters could investigate how many spiders it would take before the engine seized. My bet would be thousands.
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Fri Apr 10, 2020 5:49 am quote
Juan, it depends on what spiders ...
I forgot with a hot engine ... the oil is more liquid and drains better.
I must also buy a new lift bench for the scooter, it is also convenient to clean it better. I saw one hydraulically operated but it costs 700 Ä.
Molto Verboso
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Fri Apr 10, 2020 6:11 am quote
I also agree the blowing out with air is or somewhat questionable value.

Letting it set over night might get some extra out and it might be interesting to put a clean pan under it after letting it set for a couple minutes to see how much more comes out sitting all night!

I'm making a wild guess but would be surprised if over night it amounted to more that couple ounces of oil if that much.

As for flushing with clean cheap oil before refilling with good oil I have to wonder if that would be leaving too much cheap oil in that would dilute the good stuff.

Now if you were talking about an engine that had set for several years then a good flush and refill would be a good thing!
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Fri Apr 10, 2020 10:32 am quote
Wouldn't forcing air into the engine, creating air pressure, be bad for the engine seals? Could you possibly force oil into places it shouldn't be? Sounds like a bad idea.
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Fri Apr 10, 2020 11:40 am quote
Quote:
As for flushing with clean cheap oil before refilling with good oil I have to wonder if that would be leaving too much cheap oil in that would dilute the good stuff.
its certainly better than leaving a portion of dirty abrasive oil to mix with the good stuff...
Veni, Vidi, Posti
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Fri Apr 10, 2020 11:44 am quote
jerryd wrote:
Quote:
As for flushing with clean cheap oil before refilling with good oil I have to wonder if that would be leaving too much cheap oil in that would dilute the good stuff.
its certainly better than leaving a portion of dirty abrasive oil to mix with the good stuff...
On some level I agree with you jerry, but on some level I'm thinking that a double-flush of motor oil is only necessary in cases of EXTREMELY over-run oil, or something was let to sit for a long time and allowed rust to build up in the case.

In an engine that runs in any sense with normal frequency, the only way you build up abrasives in the oil is if the filter gets so blocked as to allow the bypass to open. And that shouldn't happen until WAY past the recommended drain interval.
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Fri Apr 10, 2020 12:01 pm quote
It is better to remember that damp condensation can form in the tank of the compressors and it is not healthy to add humidity to remove a few grams of oil. If there is dirt, it is better to remove the oil pan to clean. My grandfather said that making the tip of the pencil many pointed, it breaks easily.
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Fri Apr 10, 2020 12:01 pm quote
This is what happens when people have a lot of time on their hands to sit at home and come up with solutions to problems that don't exist.

If you think there is a lot of material in your oil, for example, if one day you find a lot of metal in the screen, next time change it while the oil is cold. It is more likely to hold particles in suspension and carry them out.
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Fri Apr 10, 2020 12:09 pm quote
I would bet anything dark in the oil is either carbon or metal particles. both are abrasive.

my suggestion is cheap and effective. running some air through does nothing.

there is a substantial amount of oil left in the engine that wont come out by any other means save disassembling the motor completely.
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Fri Apr 10, 2020 12:11 pm quote
If there are too many particles in the oil there is a problem but it does not depend on the oil ... Not necessarily.
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Fri Apr 10, 2020 12:42 pm quote
Sorry Max6200 for hopping to a side tract, but this brought to mind a picture I saw recently

1946330942.jpg

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Fri Apr 10, 2020 1:04 pm quote
Sounds about as dumb as starting the engine to "run out" the last drop! Some brit mechanic did that to my 1960 Honda Hawk for its first oil change. I was a 19 year old kid with my first motorcycle and just KNEW that was a stupid technique!
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Fri Apr 10, 2020 1:15 pm quote
Interestingly enough, there are Yamaha models that require you to run the motor for 30 seconds after draining all the oil, to get more out, and Waverunners where an oil change involves sucking half of it out and replacing that half, so you never have completely clean oil in it.
Veni, Vidi, Posti
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Fri Apr 10, 2020 2:19 pm quote
RRider wrote:
Sorry Max6200 for hopping to a side tract, but this brought to mind a picture I saw recently
No need to apologize. Clever way to dispose of the oil. I always take it to be recycled. It's easy and it's free. Now the coolant another story. I usually have to take it to the boondocks & sign my life away.
Veni, Vidi, Posti
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Fri Apr 10, 2020 5:24 pm quote
RRider wrote:
Sorry Max6200 for hopping to a side tract, but this brought to mind a picture I saw recently
Seven years before the first Earth Day.

Folks did a lot of stupid shit back then (some still do).

I'd bet that -- if you could back the picture off to a wider view -- the guy would be smoking a cigarette.
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Fri Apr 10, 2020 7:56 pm quote
Attila wrote:
I forgot with a hot engine ... the oil is more liquid and drains better.
Wouldn't 5w40 be more liquidy at colder temps? After all its 5w40.
Veni, Vidi, Posti
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Fri Apr 10, 2020 8:15 pm quote
S.Ro wrote:
Attila wrote:
I forgot with a hot engine ... the oil is more liquid and drains better.
Wouldn't 5w40 be more liquidy at colder temps? After all its 5w40.
Which is the oil of choice by the veapa gods and goddesses.
Molto Verboso
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Fri Apr 10, 2020 8:46 pm quote
So Max, are you saying your scooter needs a blow job ?
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Sat Apr 11, 2020 12:11 am quote
Max6200 wrote:
S.Ro wrote:
Attila wrote:
I forgot with a hot engine ... the oil is more liquid and drains better.
Wouldn't 5w40 be more liquidy at colder temps? After all its 5w40.
Which is the oil of choice by the veapa gods and goddesses.
Since Vespa is a Tuscan product, the oil of choice will be the extra virgin olive oil from Tuscany.
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Sat Apr 11, 2020 7:55 am quote
Hows about soybean oil?
https://www.youtube.com/watch?v=sbPxLm21gek
.

Or maybe bacon grease? mmmm, bacon.
https://www.youtube.com/watch?v=uzHRYxRiboc
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Sat Apr 11, 2020 10:30 am quote
OK, now that we're off topic... I use vegetable oil for two unintended uses:
1. In my small chainsaw
2. As lighter fuel for BBQ coals

Works well for both applications and is environmentally friendly😎

Miguel
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Sat Apr 11, 2020 11:01 am quote
In industrial use, biodegradable oils are increasingly a very big thing... mostly in hydraulics though.

Makes a big environmental difference especially in ships, where hydraulics are, ahem, sometimes known to leak a bit, or spill oil during the oil changes.
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Sat Apr 11, 2020 11:26 am quote
Miguel wrote:
OK, now that we're off topic... I use vegetable oil for two unintended uses:
1. In my small chainsaw
2. As lighter fuel for BBQ coals

Works well for both applications and is environmentally friendly😎

Miguel
For bar oil, I assume. ...interesting....
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Sat Apr 11, 2020 11:54 am quote
tdrake wrote:
Miguel wrote:
OK, now that we're off topic... I use vegetable oil for two unintended uses:
1. In my small chainsaw
2. As lighter fuel for BBQ coals

Works well for both applications and is environmentally friendly😎

Miguel
For bar oil, I assume. ...interesting....
Yeah, bar oil. I use Canola oil.

I use a Makita 14" battery-powered chain saw and have had it for about 2 years. It is really quiet, requires no maintenance and never fails to start. It uses the same makita batteries I use for my other Makita battery-powered tools so I just bought the saw by itself. It never ceases to amaze me with its power and capabilities. What convinced me to get it is a YouTube video that shows a guy cutting a 24" log in half. Its perfect for my uses.

Miguel
Molto Verboso
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Sat Apr 11, 2020 5:01 pm quote
Miguel wrote:
I use a Makita 14" battery-powered chain saw and have had it for about 2 years.

Miguel
I presume its the 36V one. How long does the battery last for when cutting?
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