You can get these bottle of stuff that you put in the oil prior to an oil change, run the engine for 5 mins then turn of and do the oil change with a lot more gunk coming out.

Are these degunk things worthwhile. I ask as i have waited to long for an oil change and i will do one tonight but i would like to get as much crap out as possible.

I always use the Wynns Engine Flush, helps get any crud out from the lifters especially if they are a bit noisey before an oil change.

Add half a litre of ATF its better than any off the shelf product and cheaper.

i would question wether the rubber seals in the engine will stand up to atf?

I wouldn't bother - there's so much residual oil left in the car when you do an oil change, whatever crud you put in will eventually contamiante the new oil.

 

Of interest I did an oil change the weekend before last - then bought some oil (better spec) of SuffolkZX (Richard - many thanks) and did another oil change last weekend. So, the oil I took out was 1 week old - and it came out almost black - you'd swear that it'd been in there 6 months...

 

So, reasoning is, there's lots of old oil remaining when you do an oil change - therefore do lots of oil changes if you want to remove the crud.

 

Good luck

 

Jack

use the forte oil flush, one of the best out there, and it actually works. you need to run it in the engine a couple of days before you drop the oil.

its only available from places that have received special training from forte. they also do an injector/fuel flush which is also very good.

i would question wether the rubber seals in the engine will stand up to atf?

Mechanics have been using ATF for years, personally I would only use an engine flush as a last resort.

...I'll tell you somthing else mechanics do - as witnessed by a mate of mine with his wife's brand new Renault something or other. Goes like this. Change the oil at the first service interval ie after running-in, and to make sure that they get all of the oil out of the system, after draining, they run the engine to pump any residulal oil out of the engine.

 

So, when he pics up the car he can hear the bearing of the turbo whistling... knackered turbo, gets replaced under the warrenty.

 

In talking to the mechanic he said that they did this because customers complain because the new oil looks quickly looks like the old oil - they get accused of charging for an oil change whilst not having done one. So to prevent this they get as much oil out of the engine as possible.

 

...this was a main Renault agent.

 

My mates wife now drives a Honda.

.. running the engine to get residual oil out - thats bad!

I know jaguar dont recommend oil flush on older cars or any that have done 80000miles as they are prone to smoking after.sometimes engines build up deposits that help to seal the engine internally.wash em away and you start to get problems.

...what I did with my NA when I bought it last November was run 0-40 fully synthetic in it as both a thin oil for winter cold weather - and as a flush. I'm not sure if it works as a flush, but being thinner, to my simple mind, it must 'swill-around' a bit more than a thicker oil...

 

Of note, the engines noiser with a thinner oil.

 

Good luck

 

Jack

I agree with Jack. I wouldnt bother putting any degunk in an old car (ie. 5 years plus) as it will unsettle all the crap and conjealed oil at the bottom of the sump which could end up in certain engine parts that could cause blockages!