engine flush for older BMW engines

[Tom]

has anyone tried flushing their un-rebuilt older BMW engines like the M20, M30, etc and older before?from what i do know, and believe, there's plenty of sludge build-up in the combustion chamber, valves and etc. it does quiet down the engine while running, plus, insulate it from leaks and stuff.how disastrous or good would it be to do a flush on these engines?would it be worth the try for the gains(if any)?Thanks.Tom

 

[bimmerman]

Good question! I also have a question. How bout the M50,52,54 engines? Why flush? Because I was told that when changing to a different engine oil it is best to flush first to realise the full potential of your new oil. Like going from semi synth to fully synth.How bad is flushing?

 

[e23_728i]

The guys who look after my car has always advised against flushing for my m30b28 engine... As long as it has regular oil changes, that should be enough already. The flushing oil has rather harsh agents in it... my .02 rupees...

 

[NumberTWO]

I did it once when I convert from M1 to Q8, on my M52.. Next thing I was welcomed by the 'tick tick' sound from the engine whenever I do a start... However, after my second service using Q8, it has somehow helped the situation..

 

[keray]

Flushed my engine before m50, not much difference either way as far as I can tell. The engine always feels smoother after an oil change but will revert to its old self after 2-3K.

 

[kevster30]

Tom,It will feel smoother after the flush and THAT'S IT...........

 

[ichiwan2]

There are three main types of engine flush. One is the 250+ml can like Justice Brothers type of engine flush which you pour into the engine oil filler and run/drive for about 15 min to half an hour. Contains strong detergents to remove sludge.Other type is the lighter oil like those sold by Shell and these also contain detergents. Basically a 4 litre pack. You drain the old oil/ leaving the filter on and let the engine run for 10-15 minutes at low RPM as recommended by Shell. You then drain the lighter oil and change to a new filter.The third type involves using cheaper mineral oils instead of the engine flush (the second method).Pros and Cons.Been told that the detergents can be harmful to the engine - , i.e. damage your gaskets, seals etc, dunno how true that is. If you believe its true, then the last method is for you.I prefer the second method, but would suggest that it be done once every four services or so.Done the first and second methods - not at every service tho. Even done the first and second together, i.e., put in the Justice Brothers, drive to the workshop and used the shell engine flush.My car is still running ok.Benefits - super clean oil, very little specks of carbon seen on the dipstick and this condition lasted for at least 2000km. After that, its back to normal.Car definitely felt lighter after the flush. One of my friend lives by a variation on the third way. He changes oil every 3,000km.Your car, your choice.

 

[ICEMAN 68]

Originally posted by ichiwan2@Dec 22 2004, 04:06 AM One of my friend lives by a variation on the third way. He changes oil every 3,000km.
that's a kewl statement ....engine oil change every 3K usage ...Well TOM my engine oil is always changed every 30 ~ 45 days no matter how far i travel ......Keeps my engine smoother and cooler

 

[Tom]

kev, that's bold hahahaiceman: wow, you're crazy.....thanks for all the input guys.CheersTom

 

[KiNaKa]

i change my engine oil every 2 months... engine run smooth....we have to take care of her, she let u feel the pleasure....