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Author Topic: flush engine when doing a oil change  (Read 2129 times)

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SteveMJ

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Re: flush engine when doing a oil change
« Reply #15 on: 10 December 2008, 10:47:06 »
Quote
Just brought 5ltr of gm 10w 40 oil and a gm oil filter ;D ;D


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Miggy24

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Re: flush engine when doing a oil change
« Reply #16 on: 10 December 2008, 11:26:38 »
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Glynn

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Re: flush engine when doing a oil change
« Reply #17 on: 10 December 2008, 16:23:58 »
a good friend of mine helped develop the v6 engine at Ellesmere Port and he advised me to flush my 3ltr every time i change the oil . according to him the oil pressure is regulated to 5 bar by the use of a small bore hole in the pump ...if this blocks it can cause the pressure to raise to 10 bar , meaning you spend all your time chasing leaks  ::)

he actually showed me an old pump and pointed out the above mentioned bore ...it is very narrow and i imagine it could block quite easily ...

on the plus side , he said the best flush  he's found was available in wilkinsons dept store , and cheap as chips  :y



bear in mind guys this applies to the v6 , not sure on 4 pots
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Kevin Wood

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Re: flush engine when doing a oil change
« Reply #18 on: 10 December 2008, 17:57:16 »
If you start a regime of flushing it regularly from a known clean state (from new / after a rebuild) that's fine, but flushing an engine of unknown history is bad news, IMHO, due to the volume of crud that could get dislodged in one go.

TBH, modern oils have good detergent additives, so, if the car is regularly serviced, an excessive amount of rubbish won't build up in the first place, and any that has, due to previous abuse, will dissipate more gradually.

Kevin
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ians

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Re: flush engine when doing a oil change
« Reply #19 on: 10 December 2008, 19:17:42 »
I would do a regular oil change - no flush.   Aim to do another change 1k later - sooner if the oil is getting dark.  Then continue to keep an eye on it - you will find it takes longer to go dark.

On my 3L I'm heading towards regular 5k intervals - personally I think 3k is a bit excessive, depending on use (long vs short trips etc),  but undoubtedly you should change it well before it goes black.  That way you are flushing the crap out with the old oil regularly anyway.   At ten quid or so a change it is well worthwhile maintenance.

In terms of what else to do, on your 2L I would give the idle control valve and throttle body a good clean and don't forget the nozzle under the throttle body.  There is a great guide in the maintenance section which covers all this. :y
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