johnfm

Check my last service invoice & noticed they had used engine flush. I'm doing my own this year. Should I use engine flush or, as I think, not risk pouring some gunk remover into my engine??

Phil Raby

I wouldn't...

Roygarth

I agree with Phil, remember the gunk seals the engine!

Brgds
Piers

robmug

Huh? Are you saying that the flush doesn't achieve its intended purpose?

I know that using the flush isn't percieved as OK, but don't know why...if it works, shouldn't it be a good thing to do?

johnfm

No flush for me

(Phil, does that count as a toilet joke??)

John Boggiano

Damn!

Too slow!

Phil Raby

Well, Piers actually has a point - using flushing oil can lead to oil leaks developing. Also, to get the stuff pumped around you have to run the engine with what is basically a very thin oil as the only lubricant. And then there's always going to be some left in which will dilute your new oil.

Other than that, it's great stuff

warmfuzzies

If you feel the need to flush.....use a cheap oil and run it for a couple of miles to get hot, then drain the whole lot.
This way you don't mess with any lubrication proprties of the oil that's already in there.....

Kevin

springer3

Modern oils have a detergent package that should keep things nice and clean anyway. Porsche engines don't seem to have dead zone where gunk can stagnate. Things are pretty clean on the Porsche engines I have been into.

Bottom line on a flush: waste of money at best

My $0.02 worth.

TMH

I'm wondering whether this "engine flush" reported on your service invoice was just another way that the dealer (?) could get a few more quid out of you. I don't recall Porsche recommendations in the owners manual for "engine oil flush" at any specific service interval. I am going to check my book tonight. Bottom line, though, is that I don't think it is necessary, especially if you continue to change oil at or before the recommended service interval frequency.

Tom

johnfm

I'm not going to bother with engine flush. It seems to me that since you cannot get all of the oil out of the system during an oil change, all I will accomplish is leaving some of the flush (though diluted) in the oil system. NO THANKS.

Phil Raby

Interesting point. The concept of using flushing oil is rather old-fashioned and dates back to the days when engine oils weren't as refined as they are now. Indeed, when I was a kid I remember my father, who always used to service his own cars, being scathing about the stuff some 30 years ago...

Arjan B.

D O N ' T F L U S H !!!

We flush only in case of an full of dirt engine, a engine which contains a lot of coal and old oil residu.

With 'we' I mean our GM Dealership, and we havo only engines without 'dry sump' systems.

Flushing is removing dirt and coal and black sludge, but when you change oil every year, it will be enough for a clean engine. The additives in synthetic oil are strong cleaners and so it does'nt make much difference with a cleaning flush.

A safer way is to fill 1 liter of Dextron II or III in your engine [automatic gearbox oil, red coloured] before a fresh fill. Put it in your engine toghether with the still in the engine 'old oil' and let your engine run 1/2 hour on 3000 rpm.
Then change oil and filter, and fill only with a good brand fully synthetic [no hydro crack oil] like Mobil 1 or so.

Dextron oil is extremely cleaning by itself and it makes no damage to your engine.
It removes also black sludge and coal.
I [we] have the experience with this for over 15 years, and use it every day with cars that stuck in traffic all day.

Good luck

Phil Raby

Amazing - a thread where everyone is in agreement

Roygarth

I use engine flush weekly and strongly reccomend you all do same. Anybody who disagrees please leave!

Brgds
Piers: