Question for diesel auto owners who service their own car.

patrolman pete · 10th December 2021, 17:22

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 · 10th December 2021, 18:29

Quote:

Originally Posted by 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 !

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 · 10th December 2021, 19:44

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 · 10th December 2021, 21:05

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.--

Mike Trident · 13th December 2021, 20:33

Mine is pretty much instant too.

patrolman pete · 13th December 2021, 21:13

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.

KeithA · 17th December 2021, 09:19

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 · 17th December 2021, 11:23

Quote:

Originally Posted by 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

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.--------

buchanan · 18th December 2021, 06:11

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 · 18th December 2021, 18:09

Quote:

Originally Posted by 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.

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 .

10th December 2021, 17:22	#1
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Question for diesel auto owners who service their own car. 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 !

13th December 2021, 20:33	#5
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Mine is pretty much instant too. __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s

17th December 2021, 09:19	#7
KeithA Loves to post Rover 75 Conny Tourer Auto Join Date: Mar 2016 Location: Essex Posts: 347 Thanks: 75 Thanked 94 Times in 71 Posts	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 __________________ 2003 Tourer, Connoisseur Auto

10th December 2021, 19:44	#3
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	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 !

10th December 2021, 21:05	#4
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	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.--

13th December 2021, 21:13	#6
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	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.

18th December 2021, 06:11	#9
buchanan Buchanan Rover 75 connoisseur se ctdi Auto Join Date: Feb 2010 Location: Belfast Posts: 332 Thanks: 3 Thanked 30 Times in 18 Posts	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.