Question for diesel auto owners who service their own car.

[patrolman pete]

I've today carried out an oil service on my connie auto and an issue that I've had since I first serviced the car back nearly 4 years , is that the oil light goes off instantly even after the first start up and filter change. I have driven the car over 40,000 miles and carried out 4 oil changes. My doubting mind had me thinking that some bodger had wired up the oil light to the alternator light due to a fault with the oil pressure and part exchanged the car !

The engine is sweet and no untoward noises have been heard over the years .

My best mate came over for a coffee whilst I did the oil change and I mentioned this issue in passing and said I don't think the engine has a problem and as a mark 2 diesel owner himself said his car does the same !

My manual tourer warning light goes out once the oil filter fills up as you would expect , so does anyone else have this quirk , a bit like the brake failure warning message on cold winter start ups !

[clf]

I've today carried out an oil service on my connie auto and an issue that I've had since I first serviced the car back nearly 4 years , is that the oil light goes off instantly even after the first start up and filter change. I have driven the car over 40,000 miles and carried out 4 oil changes. My doubting mind had me thinking that some bodger had wired up the oil light to the alternator light due to a fault with the oil pressure and part exchanged the car !

The engine is sweet and no untoward noises have been heard over the years .

My best mate came over for a coffee whilst I did the oil change and I mentioned this issue in passing and said I don't think the engine has a problem and as a mark 2 diesel owner himself said his car does the same !

My manual tourer warning light goes out once the oil filter fills up as you would expect , so does anyone else have this quirk , a bit like the brake failure warning message on cold winter start ups !

I do my own, and never noticed any difference. In my head, the oil light should not change as the oil is poured into the top and through the engine, so presure should build regardless of the amount in the filter. Could the manual engine be a little bit more gummed up slowing the flow of oil around the oilways, therefore slowing the pressure to the sensor?

The cold winter brake light warning issue is not normal, and is likely to be corrosion or moisture at the contacts (either bulb, tracks or plugs). Mine does this too, by the way, and used to be every time in winter til I cleaned up the contacts. 2 winters was fine, then last year it was intermittent. SO have left as it is for now - has only happened once so far since the cold weather kicked in.

[patrolman pete]

Just seems odd that my 53 reg and my mate's 54 reg diesel auto both have the same oil light issue. I'm not worried as the engine is sweet and hasn't shown any issues in the 4 years I've had her.

I've owned my tourer nearly 19 years and she had only done 8000 miles when I bought her and she is now a couple of hundred miles from 200,000 miles and I've done every service myself and the oil light behaves like every other car I've ever owned when first started after an oil change.

I'm not worried , just curious as these engines appear bulletproof and I've already clocked up nearly 1/4 million miles between them in my ownership !

[COLVERT]

I've done the oil and filter changes on my cars all of my life.

My R75 light goes out very quickly. When you drain the oil there's lots of it still around the engine in the oil-ways.--If you had a new engine that had never had oil in before I'm sure it would take twice as long until the oil light went out.--After just a change of oil the whole thing has oil in it right from the off.--:icon_lol:

[Mike Trident]

Mine is pretty much instant too.

[patrolman pete]

Thanks Mike , I was beginning to think no one understood the question lol ! Every engine I've ever changed the oil and filter on , you would always wait a second or two for the oil light to go out.

On my Connie auto it goes out at the same time as the battery light even on first start up after an oil change !! Unlike my manual tourer which is a year older, you wait that second or two.

It must be a case of '' they all do that sir'' which was the answer I was looking for.

[clf]

Thanks Mike , I was beginning to think no one understood the question lol ! Every engine I've ever changed the oil and filter on , you would always wait a second or two for the oil light to go out.

On my Connie auto it goes out at the same time as the battery light even on first start up after an oil change !! Unlike my manual tourer which is a year older, you wait that second or two.

It must be a case of '' they all do that sir'' which was the answer I was looking for.

surely the pressure should remain the same pre and post filer change, since the oil filter/filtration is remote and I assume require the pump/pressure to pump it through the filter. If you started the engine dry, then poured the oil in, I imagine the light would take a second or two before it went out, hence my query regarding blockages in the oilways earlier.

[COLVERT]

surely the pressure should remain the same pre and post filer change, since the oil filter/filtration is remote and I assume require the pump/pressure to pump it through the filter. If you started the engine dry, then poured the oil in, I imagine the light would take a second or two before it went out, hence my query regarding blockages in the oil ways earlier.

I've never heard of anyone starting the engine after draining the oil and then trying to fill it with the engine running.--Blow back past the pistons would blow the oil straight back out of the filler cap. The oil light would never go out.---:shocked:

However you. personally, would be very well oiled.---:laugh:


Though I'm sure you would prefer whisky to oil.----:icon_lol:

[clf]

I've never heard of anyone starting the engine after draining the oil and then trying to fill it with the engine running.--Blow back past the pistons would blow the oil straight back out of the filler cap. The oil light would never go out.---:shocked:

However you. personally, would be very well oiled.---:laugh:


Though I'm sure you would prefer whisky to oil.----:icon_lol:

I have never heard of anyone starting a dry engine to add oil, but it would be the only way I can think of for an oil light to remain on for longer than normal with our engines (or any with a remote filter) after an oil change. :shrug:

Actually prefer oil to whiskey (spelled correctly ;) - search for Black Bush - dare ya :p:)

[KeithA]

I don't tend to do my own oil changes these days.... Can't be bothered with the fuss of getting rid of the oil. Instead I just get the garage to do it at mot time, then do the test of the service myself. So I haven't observed this on a 75.

However, might it be related to the large oil capacity of the m47r engine? The void in the oil filter will be a very small % of overall capacity so it gets up to pressure very quickly?

Sent from my moto g(30) using Tapatalk

[COLVERT]

I don't tend to do my own oil changes these days.... Can't be bothered with the fuss of getting rid of the oil. Instead I just get the garage to do it at mot time, then do the test of the service myself. So I haven't observed this on a 75.

However, might it be related to the large oil capacity of the m47r engine? The void in the oil filter will be a very small % of overall capacity so it gets up to pressure very quickly?

Sent from my moto g(30) using Tapatalk

I don't think the oil capacity is a factor. If the sump was twice the size the filter would take the same time to fill. It mainly depends on the condition of the oil pump and if it's a refill from dry or after a normal drain down.--------:shocked:

[COLVERT]

I have never heard of anyone starting a dry engine to add oil, but it would be the only way I can think of for an oil light to remain on for longer than normal with our engines (or any with a remote filter) after an oil change. :shrug:

Actually prefer oil to whiskey (spelled correctly ;) - search for Black Bush - dare ya :p:)

Worn oil Pump ???

You can tell by the spelling spirits are foreign to me.---I can vaguely remember maybe 60 years ago having a Bacardi and coke or Vodka and lime but that's it.

Nowadays it might be the odd small bottle of beer once or twice a week.


:beer2::beer2::beer2:

[clf]

Worn oil Pump ???

You can tell by the spelling spirits are foreign to me.---I can vaguely remember maybe 60 years ago having a Bacardi and coke or Vodka and lime but that's it.

Nowadays it might be the odd small bottle of beer once or twice a week.


:beer2::beer2::beer2:

the spelling depends on where the whiskey, or whisky is made ;)

[Andy_with_a_screwdriver]

I've never heard of anyone starting the engine after draining the oil and then trying to fill it with the engine running.--Blow back past the pistons would blow the oil straight back out of the filler cap. The oil light would never go out.---:shocked:

However you. personally, would be very well oiled.---:laugh:


Though I'm sure you would prefer whisky to oil.----:icon_lol:

As anyone who started the engine after accidentally forgetting to put the oil cap back on can tell you :grin:

[buchanan]

I would be more worried if the oil light did not go out quickly, going out quickly it shows your oil pump is doing its job.

[patrolman pete]

I would be more worried if the oil light did not go out quickly, going out quickly it shows your oil pump is doing its job.

It's not going out quickly , it's going out instantly.

After asking the question ,it appears that no one has ever on any car , when going for the first start up after an oil and filter change, looked at the oil light and had to wait a couple of seconds for it to go out whilst it builds up the pressure !

My tourer behaves as any other car on first start after an oil change and then after goes out straight away on every other start up.

The connie and my mates mark 2 connie auto both go out in sync with the battery light which made me wonder if someone had been joining some wires behind the clocks to hide a fault.

There isn't a blockage in the engine as it would have seized, and there won't be pressure still in the engine before it's restarted so I'm not going to worry as we are both in the dog house after she failed her MOT . :icon_redface:

[clf]

After asking the question ,it appears that no one has ever on any car , when going for the first start up after an oil and filter change, looked at the oil light and had to wait a couple of seconds for it to go out whilst it builds up the pressure !



I have, but only noticed this on engines with the oil filter mounted directly to the block, and not a remote filter as on the M47 or the Passat B5.5 pd 130 engine I had before.

[Mike Noc]

After asking the question ,it appears that no one has ever on any car , when going for the first start up after an oil and filter change, looked at the oil light and had to wait a couple of seconds for it to go out whilst it builds up the pressure.

I don't know about a couple of seconds Pete, but I get a slight delay when starting the engine after an oil change before the oil light goes out.

The connie and my mates mark 2 connie auto both go out in sync with the battery light which made me wonder if someone had been joining some wires behind the clocks to hide a fault.

If you are worried, pull the plug off the oil pressure switch and check to see if the oil light stays on after the engine has been started.

[HarryM1BYT]

If you think the oil light might be telling lies, just unplug it at the pressure switch = if light remains on, you can be reasonably sure it's doing its job..