Oil use in 2015 D-Max

901 - I do not know of, nor heard of anyone, having oil consumption problems with the D-Max. The Isuzu engines are a particularly good engine overall.

Do you know what the amount of oil is, between high and low marks on the dipstick?

Did you check the oil with the vehicle level, and after it had been sitting for some time? - both times?

Often a slight difference in slope will cause a different reading on the dipstick. It pays to check the oil in the same position each time - preferably a known level concrete floor.

A sudden increase in oil useage in turbocharged diesels is often caused by a blown turbocharger oil seal.
Is the exhaust showing blue smoke under normal operating conditions? (you need someone following you to gauge this).
Blue smoke is indicative of excessive engine oil consumption, and often caused by said blown seal.

Are you using the correct grade of oil, and the one recommended in the manual?

I have found that some oils have additives that are too "slippery" for some designs of engines, thus causing excessive oil consumption.

Back in the 70's and 80's, it was well known amongst our local group of heavy equipment contractors that Mobil oil was prone to cause excessive oil consumption - and this was noted as being accompanied by regular blue smoke from the exhaust stacks of machines using Mobil oil.

We put it down to some particular new additive that Mobil was using - but we never found out what the precise reason was for the Mobil oil to be so prone to excessive consumption.

Those of us concerned about the Mobil oil problem, refused to buy or use Mobil oil and we used Caltex, Shell, Golden Fleece and Esso oils as our preferred brands - all of which provided good service and low oil consumption.

Some Castrol oils have also been noted as being prone to excessive oil consumption.

Cheers, Ron.

901
Is the engine oil a decent quality of oil. Many service centres don’t use decent well recognised oils and that may be the reason for excessive use IF it is actually happening.
Hot running and towing may also cause more useage as higher cylinder pressures cause slightly more blowby.

I haven’t noticed more use with Mobil 1 diesel but do notice the oil stays far cleaner longer than with other oils used. At 16,000km the oil is much cleaner than Mobil Delvac MX ESP and other oils are at 10,000km. Has to be the sealing of the rings.
You need to observe the exhaust when driving while hot, as mentioned, and keep a close account of type of work to ascertain what is really happening.

If the vehicle had done many km of relatively cold running, nd stop start driving, there may have been some dilution of engine oil with I unburnt diesel fuel which has gone past th rings. When run hot, that will then use more than normal seeing the oil is degraded a small amount.

Glyn

I have owned 6 Isuzu built diesel vehicles over the years and the worst oil consumption that I have had was under 1 litre in 10k, mostly they use very little and the useage that I found was all when the vehicles were near new.

As you mention that the vehicle is dealer serviced do not forget that the scheduled oil changes are at 20k intervals, so no change at the 50k service. Can you be sure that the oil level was correct at the last service (40k), or even if it was in fact changed and if so what specification oil was used, was it in fact a CF4 or better oil.

Should the vehicle NOT be subjected to reasonable loading they do tend to glaze the bore. Incorrect oil spec can also result in glazing of the bore. A good load and hill can do wonders for glazed bore.

I would suggest that firstly you do an oil & filter change so that you know the quality of the oil in the engine (and also that it is fresh oil), load the vehicle and drive it as though you stole it for a short time and then monitor for the next 10k.

Regards
Athol

Glyn - don't forget, "dusting" is an ever present threat to engines in dusty areas.

Make sure all intake hose clamps and brackets are secure, and that there's been no penetrative damage of any kind to any part of the intake system.

Check the filter for damage and proper sealing. Slack mechanics have been known to fit air cleaner elements improperly, or with debris under the seal.

"Dusting" is slow and sinister, and you have no warning of severe engine damage until its too late.

I'm dealing with a 4 cyl Toyota diesel in a forklift at present, that's been "dusted".
A slack fitter installed a new seat and put 4 new bolts that were too long, through the seat runner mountings.
When the engine hood was closed, one of the bolts was rubbing on the alloy intake manifold - eventually wearing a hole right through it.
You'd be amazed at the amount of dust that gets through an 8mm hole.

Cheers, Ron.

I have a 2013 dmax, doesn't use oil. The dipstick pretty well seals the dipstick tube and if you pull it straight out can give an incorrect reading. I pull the dipstick out a bit and leave it for a minute or so then dip it and take the reading.

HI
I don't follow Holden utes but after having a conversation with local parts Manager about the 14-15 utes whether it was Colarado/Isuzu/ who ever there sold thru . The 13--15 utes had consumption issues re multiple engines a week were being replaced . The conversation would have been early last year .

Mobil engine oil is full of detergents compared many other brands . It will be easy to reduce consumption by not using there mineral grade oil .

Mobil 1 synthetic is a good product but $$