[Sameer016]

Hi,
My 2021 BS6 Diesel Altroz is experiencing higher level of engine oil since purchase.

SVC are hopeless as usual. Last year they replaced the injectors but this year too, when the time came for oil change the oil level was way higher than Max mark in dipstick (almost twice above max mark)

Only explanation I can think of is some how diesel is mixing with engine oil, causing its level to rise gradually.

Looking for advise to future course of action.

[ajmat]

That because extra diesel was pumped in to create higher temperatures to regenerate the DPF. The chances are that you use the car for short journeys. You need to give the car a good fast run once a week to let the DPF regenerate properly.

[Sameer016]

Originally Posted by ajmat

That because extra diesel was pumped in to create higher temperatures to regenerate the DPF. The chances are that you use the car for short journeys. You need to give the car a good fact run once a week to let the DPF regenerate properly

This could be the reason. I primarily use it for shortish rides. Probably explain my low fuel efficiency as well. But is diesel mixing with oil not a failure of some sort like packing, gasket?

And DPF cleaners from like Liqui Moly works?

[Bibendum90949]

Originally Posted by ajmat

That because extra diesel was pumped in to create higher temperatures to regenerate the DPF. The chances are that you use the car for short journeys. You need to give the car a good fact run once a week to let the DPF regenerate properly

Does it mean a failed/aborted DPF passive regen can make diesel enter the oil sump. Not sure on that unless there's some other issue in the chamber like bad tolerances with piston rings, cylinder walls etc.

Yes the ECU does spray more diesel to make the exhaust temperature conducive for DPF regen. But if the rpm isn't good enough, it aborts the process I guess. Ideally diesel shouldn't reach the sump under any circumstances. Please correct if I'm wrong.

[Bibendum90949]

I did some asking around. Below Mercedes document(dated 2012 though)shared by bhpian Grease_Monkey. That pretty sums up the issue at hand faced by OP, more so with him confirming that he's often driving the car for short distances and also corroborates what ajmat mentioned .

Though most of us know diesel isn't a choice for short city commutes in BS6 era and for predominant city usage, I just wonder what are the perils of diesel mixing with engine oil?

[dhanushs]

Originally Posted by Bibendum90949

..I just wonder what are the perils of diesel mixing with engine oil?

While you wont find any immediate harmful effects, it will definitely be decremental over the long term. Engine oil is primarily present for lubrication and diesel dissolves the purpose.

[PreludeSH]

Diesels are forcing you to go on longer drives

At this rate new driving behaviours will have to be learnt. Things are getting difficult for diesel powered engines. Should be encouraging hybrids even more for efficiency and environment.

[Kosfactor]

Originally Posted by Sameer016

Hi,

Only explanation I can think of is some how diesel is mixing with engine oil, causing its level to rise gradually.

Looking for advise to future course of action.

I would advice you to get some attention of the service manager and get a closure to this issue. Periodically check the oil level after its fixed.

Previous thread on the same topic.

Link (2021 Tata Altroz DPF issues and engine failure | Good experience with Tata's After Sales Service)

[anjan_c2007]

Among the perils that come with BSVI diesels ! Please get your car thoroughly checked up and have the diesel-oil mixture drained and the oil sump cleaned thoroughly, refilling the engjne oil. Please replace the oil filter and other components if any, as required. Else, starting with the head gasket, other components could get damaged in the long run with excessive oil in the engine.

The engine needs to do a long run of at least 20 kms a week. The issue will be most likely resolved if the car is taken for a long drive every week.

[Sameer016]

Originally Posted by anjan_c2007

Among the perils that come with BSVI diesels ! Please get your car thoroughly checked up and have the diesel-oil mixture drained and the oil sump cleaned thoroughly, refilling the engjne oil. Please replace the oil filter and other components if any, as required. Else, starting with the head gasket, other components could get damaged in the long run with excessive oil in the engine.

The engine needs to do a long run of at least 20 kms a week. The issue will be most likely resolved if the car is taken for a long drive every week.

Ok for sake of clarity, I drive 50km (one way) on Highway with mixed traffic once a week.

I agree the engine that DPF will not heat up in normal short drives but not able to heat up in 50 km drive is mystery to me.

I baby my car, do a proper turbo idling, warm the engine on a cold start, never accelerate hard, shift @~ 2k rpm, and yet here we are.

My car has odo with 31k kms and has gone for two major service, never got more than 18 kmpl with overall mileage of 16 kmpl. In the latest service they claimed to change oil, filter, air filter, brake oil etc and charged me 8250/-

Post DPF issues Ive altogether stopped using the car in the city, mostly use my activa.

Initially I thought DPF issue is different from oil mixing issue and your inputs are clearing my multiple doubts.

[Sameer016]

This was the oil level before 30k oil change


This was last year at 15k oil change

[Gildarts]

Originally Posted by Sameer016

I baby my car, do a proper turbo idling, warm the engine on a cold start, never accelerate hard, shift @~ 2k rpm, and yet here we are.

Have come across members recommending a bit of spirited driving for DPF regen. may be letting shifting at higher RPMs say 3K - 3.5K during your onc a week 50km drive will help.

[Deucalion]

You mentioned earlier that you shift before 2k. The thing with BS6 diesels is that for the DPF to reach the optimum temperature you've to rev it. And since the DPF won't be able to reach the optimum temperature issues like these are common in BS6 diesels. So driving spiritedly once a week will keep your engine happy. I'll attach a reference from Altroz's manual and you can see that in case the DPF light appears you've to drive in 3rd gear at around 50-80kmph(basically over 2000 rpm) for 10-15 minutes. So you can go ahead with the same practice once a week and probably your engine oil level will be the same. Hope this helps

[purohitanuj]

https://www.youtube.com/watch?v=lJtENVwAEpk

A great video explaining this issue.

[PrasannaDhana]

Originally Posted by Sameer016

Hi,
My 2021 BS6 Diesel Altroz is experiencing higher level of engine oil since purchase.

SVC are hopeless as usual. Last year they replaced the injectors but this year too, when the time came for oil change the oil level was way higher than Max mark in dipstick (almost twice above max mark)

Only explanation I can think of is some how diesel is mixing with engine oil, causing its level to rise gradually.

Looking for advise to future course of action.

Sorry to hear about this Sameer. But then the issue can be avoided if you follow this -

Originally Posted by ajmat

That because extra diesel was pumped in to create higher temperatures to regenerate the DPF. The chances are that you use the car for short journeys. You need to give the car a good fact run once a week to let the DPF regenerate properly

In almost all Altroz diesel owner groups, over 70% of the owners have this complaint. Bs6 diesels need to run longer distances to stay clog free.

My Altroz diesel has run 46500 km without a single dpf issue/ diesel mixing with oil issue.

Here's what mine looks like



Avoiding short trips, taking the engine to 3000 rpm for a few minutes, a few times a week will be enough to stay trouble free.

Once you start enjoying that punchy 1.5 turbo diesel in the 2750 - 3500 rpm band, you will keep doing it often. I do it almost daily and I still get 18 kmpl overall actual T2T fuel efficiency. From time to time, its totally okay to accelerate hard