oil/mixing synthetic and mineral.

missfire · 20-05-11, 05:43 PM

hello,

have just done an oil/filter change and have been told its too thin, 5W30 fully synth.

i have here a can of 15W40 purest mineral oil! lovely, will last all of three months i'm sure! don't have another filter at the mo. but would like the tappetytapping gonen (or less tappety) by m.o.t. time, on monday..

will it do any harm to leave the filter(which has only done a couple of hundred miles) on, as it will be full of synthetic oil, if i change the oil? and i'll change the filter next time.

thanks

4v6 · 20-05-11, 06:01 PM

Wont cause any harm i dont believe.

John. · 20-05-11, 06:25 PM

Take the filter off....and turn it upside down

....then refit.

missfire · 20-05-11, 06:28 PM

thanks

one more question if you take online mechanic paypal payments..

(i mean it!)

start engine cold - 5 bar - no tapping

as it heats up the oil pressure goes down and the tapping starts.

never goes below 3 bar while driving, 2 bar at idle, when warm. but its quite loud..

im wondering if its just a worn tappet or if half the oil is p*ssing out back into the sump when its warm/ not being sent up into the engine? sender looks like it works ok...i think.

no leaks, no smoke, no oil consumption of any kind.

just a ph***d tappet..?

missfire · 20-05-11, 06:29 PM

Quote:

Originally Posted by John.

Take the filter off....and turn it upside down

....then refit.

thats an idea!

i'm an idiot, don't worry..

missfire · 20-05-11, 06:57 PM

does anyone know if the valve on the 5 cyl engines oil pump is a viscosity valve? that varies with heat?

rich.r · 20-05-11, 08:30 PM

on the subject of mixing oils

i was informed you can mix mineral oil and part synth

but dont mix mineral with fully synth

was told part synth is a blend of oils where as fully synth isnt

are these older engines not designed to run on mineral oil

can remember people using fully synth in old ducati engines and it didnt do them any good

Sandro · 20-05-11, 08:35 PM

5-30 sinth is tooooo thin...
dont need to remove filter, just add Your mineral oil and done.
tapet noise starts just because of oil. Your engine is too old to use it.

missfire · 20-05-11, 10:17 PM

ok! will do.

4v6 · 21-05-11, 07:43 AM

Quote:

Originally Posted by missfire

does anyone know if the valve on the 5 cyl engines oil pump is a viscosity valve? that varies with heat?

Nop, oil pressure relief function only.

20-05-11, 06:25 PM	#3
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,529	Take the filter off....and turn it upside down....then refit.

20-05-11, 06:01 PM	#2
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	Wont cause any harm i dont believe.

20-05-11, 06:28 PM	#4
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	thanks one more question if you take online mechanic paypal payments.. (i mean it!) start engine cold - 5 bar - no tapping as it heats up the oil pressure goes down and the tapping starts. never goes below 3 bar while driving, 2 bar at idle, when warm. but its quite loud.. im wondering if its just a worn tappet or if half the oil is pssing out back into the sump when its warm/ not being sent up into the engine? sender looks like it works ok...i think. no leaks, no smoke, no oil consumption of any kind. just a ph**d tappet..?

20-05-11, 06:57 PM	#6
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	does anyone know if the valve on the 5 cyl engines oil pump is a viscosity valve? that varies with heat?

20-05-11, 08:30 PM	#7
rich.r Senior Member Join Date: Jul 2010 Posts: 1,832	on the subject of mixing oils i was informed you can mix mineral oil and part synth but dont mix mineral with fully synth was told part synth is a blend of oils where as fully synth isnt are these older engines not designed to run on mineral oil can remember people using fully synth in old ducati engines and it didnt do them any good

20-05-11, 08:35 PM	#8
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	5-30 sinth is tooooo thin... dont need to remove filter, just add Your mineral oil and done. tapet noise starts just because of oil. Your engine is too old to use it.

20-05-11, 10:17 PM	#9
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	ok! will do.