To flush or not to flush?

[Richard '69 Saloon]

Hi Guys,
I wanted opinions before I next do an oil change. In order to clear the oil ways (especially to the top end to aid quick lubrication upon cold starting) someone has suggested flushing the engine through with a reputable engine flush such as Millers Flush. However, what is everyones experience of such products? I am a little hesitant because I've read that flushes leave detergent in the oil residue which can remain after the new oil has been put in and break it down slightly, defeating the object. Are there any suggestions? I intend using Duckhams 20/50 but could include an additive or perhaps some hydraulic tappet oil to aid top end lubrication. What do you think?
Richard

[Phil Nottingham]

Its not the residues that's the problem its what it may loosen - if you have a lot of black sludge thats starting to flake off then definetly not unless you thinks the engine is ready for recon and there is nothing to loose. Bits of this break loose and block oilways.

If its just a thin black coating run with high detergent diesel oils are very good but even then not to be used in a good engine.

If you are not sure remove a rocker cover and you will see it - if still not sure don't try any type of flushing.

These engines must have regular oil changes irrespective of mileage and especially if used infrequently. I always do mine every 3-4K miles + filter or 18 months whichever first

[Richard '69 Saloon]

Thanks Phil that's interesting. Do you use an additive or any particular kind/brand of oil?
Richard

[johnwp5bcoupe]

I know when Plod used the V8 they had a strict weekly oil change Type of oil can of worms

[Smallfry]

Personally I would not recommend using any sort of engine flush. I ruined an Austin 1100 by using it (the brand mentioned) and have heard more than a few others have had problems too. Having said that, you always hear the bad, and very seldom the good !

Using diesel engine oil is the way to go. It will break down any sludge and hold it in suspension over a period of time. the high detergent level will do no harm whatsoever to the engine, although it may reveal wear already present that has been disguised by any deposits.

I use a 15W-40 to CF or CF/4 grade or higher, and remember that these oils can take the much higher bearing loadings of high torque plant, truck, and tractor engines. I use Ambra Premium Gold (which you've no doubt never heard of) available from any Ford/New Holland Tractor dealership.

[stantondavies]

I would back frequent oil changes in preference to flushing. And always change after a long run home, asap after you arrive back, which means planning ahead.

[Phil Nottingham]

I used Castrol GTX 15W/50 which is suitable for slightly worn engines - its not so easy to get and I now use Asda 15w/50. 20/50 is too thick and 15/40 too thin unless it a newly rebuilt engine.