QUOTE(rcracer @ Sep 7 2018, 08:24 PM)
My 1.5 year old skyactiv D has only seen 16000 km because always in city
Still no problems with DPF.
QUOTE(jason_ng101 @ Sep 7 2018, 10:49 PM)
Well, I would definitely spend most of the time driving around the small town and on a highway. The traffic won't be congested compared to the town /city But majority of the trips are short distance unless I travel on a highway. Guess it should be alright ?
DPF issues won't arise that quickly, but it likely will eventually down the road. Just a matter of early or later.
If really want a diesel engined car with DPF, please at least do a 30 minute highway run weekly, so that the DPF can regenerate passively from the heat of the engine running. Slow speed/idling can't regenerate the DPF because exhaust heat not sufficient. So DPF system will activate active regeneration mode and will inject more diesel post combustion so that the flame front will propagate further down the exhaust stream towards the DPF canister.
The problem is that many people don't know that the car is in active regeneration mode and turn off the car mid point. So the diesel that didn't get burned off will accumulate in the DPF canister. The system is designed that any such diesel accumulating in the DPF will flow back into the engine crankcase sump (that's why you see 2 levels in the oil dip stick for diesel cars with DPF; the lower "full" level for engine oil change volume indicator, and the other for "overflow" capacity). Recommended that the dip stick got checked bi-weekly to ascertain the level of overflow.
Yes, the system does warn you when the overflow needs your attention with some check engine light or other sorts. But the critical thing is that when engine oil gets diluted with diesel fuel, the lubrication properties get compromised. You'll wearing down the internals prematurely (mostly will arise in VVT issue or cylinder bore scuffing). And even if that you're aware of how the DPF works and drives long distance most of the time, the DPF will get filled up with ash. When it is full, you'll need to spend close to thousands (i don't really know the price, but seeing how overseas pricing, it is usually 2k), to replace it. Our diesel fuel quality isn't up to european level, so expect the ash to fill up sooner. Hence also, mazda will insist their diesel owners to solely pump euro5 diesel.
The issue is well known in europe, but kept "in control" because their rate of car swapping is much faster than us because of their high income and financing terms. Their cars will be sold off before it becomes an issue to them in the longer run (which we in malaysia tend to keep more than 5 years).
It is a flawed way to keep pollutants in check, but due to the majority's quick car change, the issue is not overblown yet....
THe only saving grace is our climate is rather warm, heat up is a little faster.
QUOTE(4WD_er @ Sep 7 2018, 11:34 PM)
I thought I read somewhere or from Bobby Ang youtube video saying that the Mazda diesel engine uses low compression configuration so it can avoid using DPF ?
Particulate filters are mandotory, even petrol cars will have it in the foreseeable future.
The difference with mazda is that they can avoid AdBlue (urea injection) due to the lower compression.
QUOTE(fong928 @ Sep 8 2018, 08:05 AM)
https://m.mobile01.com/topicdetail.php?f=276&t=5564061Mazda diesel engine issue in Taiwan, now Mazda official announced solution like Honda China, Subaru did...
This one is nothing too serious, some risk of coolant overflow due to the plumbing design.