New tow car

Then surely that would make it NOT one of the best engines in the world. I have never had oil dilution in any car but there again I have never owned a Mazda.  

I wouldn't have thought that 'one of the best engines in the world' would have had oil dilution problems .... 😉

 just realised I've said the same as Lornalou 😄

Best by what measure? A known Oil dilution problem doesnt strike me as a feature of a ‘best’ engine. As much as i would like a Mazda diesel their older diesels are to be avoided. 

Yes that's the one I meant, sorry for the confusion 

https://towcar.info   

This is the site I have been using for car/caravan weight ratios and for reviews. Sorry for misleading you by giving wrong site name.

That is a good site, far more useful and informative than the ‘Clubs’ service which is often innaccurate. 

Use your eyes and make notes. Popular towcars are very evident. Mazda Cx5 ain't one of them. Xtrailman quite rightly uses more frequent oil changes as a solution !!..That certainly balloons the running costs with the price of modern oils. Not a solution its a compromise and an admission of  persistent problem. Just best avoided. What car loved the test drive but they  don't have to live with the real risk of the expensive problem of oil draw into the crankcase . My advice.. look around you do your research and if someone is effusive on the choice ask them what they drive now.🤔

Anyone who has a modern diesel engined car, with a DPF and to Euro 5 will suffer oil dilution, some more than others. But to say mine does not is simply untrue, it happens and with manufacturers extending service intervals up to two years or 24000 miles makes it more evident. By having annual/12000 miles servicing with most (like it use to be) it will never reach a dilution level that could cause irreparable damage to the engine.

Mazda was well known for it because of the new architecture of that particular engine, but again frequent oil changes although not desirable would keep that wear and tear to a minimum.

Obviously if you drive a polluting pre 2009 then it does not affect you, just the people around you breathing in all that pollution, along with the black smoke from over injected fuel when accelerating.

Cleaning up fuel pollution has taken its toll on motor manufacturers, with adverse effects to diesel engines and how we have to drive to ensure it regenerates.

I can't say that I've noticed it in my ML350 though I've only had it a little over a year and covered about 10k miles. It'll tell me if the oil level is high (or low) 

Mine neither, sure it's happening but must be minimal but I still get an interim oil/filter change every 12000 miles irrespective of what the  handbook states.

Maybe ours are burning oil and that being replaced by fuel, with no difference in level  I do sniff the dipstick once in a while