oil extractor

robj20 said:
Not all cars even drain all the oil out, so what about them, when i do an oil change you only change about 4.5 litres but it holds 8+litres? So why is it crucial as you keep suggesting to drain 100% out? The extractors are fine, you can even drain the oil while its extremely hot as you dont need to come in contact with it.
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I'm intrigued to know which engine this is.

The existing oil in the system to which you've alluded will be 3.5ltrs worth will be contaminated with things such a fuel, the oil will have passed through the engine for its prescribed life so will have started to breakdown chemically and such is lubrication effect on the engine will have diminished from when new.
 
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Rotary, but nearly any car that has oil coolers will leave an amount of oil in the system.

I think you will find a lot of dealers and such use vaccum extractors to remove oil these days, its just cleaner. Its funny how no matter what car i have used them on and then been curious as to if any oil remains the result of removing the plug after results in no more than a drop or two.
 
You must have a huge oil cooler then, if it's leaving that much old oil in then it's a poorly designed system, don't you have a drain on the cooler itself?

Dealers use the systems without doubt and i would if i was doing 10 oil changes per day, but for once / twice per year i can't really see the advantage.
 
2 oil coolers and huge oil feed pipes, rotarys dont work the same way and dont contaminate the oil the same way. Still nothing wrong with the millions of boats that all use extractors to change oil.
 
Once you've used an extractor, you'll never drop the sump plug again.

Also, they're about 25 quid... no brainer!
 
been using an extractor for the last 40,000 miles. saves loads of time and effort.
 
I was thinking of buying one of the electric ones that plugs into the battery and doing it that way.
 
Interesting, didn't know you could buy these for home use. I will consider.

For the record, I've never had an engine that hasn't had a bit of metallic crap in the sump. That's been a mixture of old and new (ok, mid 90's :D) car and bike engines, some with oil filters, some without. There's never been anything wrong with them and all have been well maintained by myself. It's just something that gets in there through normal wear and tear. You see it a lot more on the engines without filters, though, that's for sure.
 
I must admit to being sceptical of these (I used to be a vehicle technician), but I tried one that I ordered from screwfix today.

Dead impressed with it to be honest, it made things a lot easier + the new oil on the dipstick is clean for a car that's done 84K :)
 
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