K&N Replacement Air Filters

[Transporter]

how is the Foam filter oil resistant to being burned in the combustion process as opposed to the Cotton filter oil? As you should know, the combustion tempretures reach up to 1200 degrees C at peak burn. This is enough to burn off just about anything. Even if it dose make it past the burn process(Highly unlikely), why would it have an effect on the sensors as opposed to other conteminates like acids produced by the burn process, and unburned fuel and particulates.

Not everything will completely burn in combustion you still get ashes, if everything would be burned off you wouldn’t need DPF box on the diesels and you wouldn't see blue smoke or black smoke from the exhaust pipes.

Unburned oil can coat the sensors with like a glaze coat and make them inoperative. For the same reason you shouldn't overfill the engine sump. How much of oil you would have to put on the filter's foam to dammage the sensors I don't know. I think, if you follow the instructions for cleaning and re-oiling you should be safe.

[Blitzen]

How much of oil you would have to put on the filter's foam to dammage the sensors I don't know. I think, if you follow the instructions for cleaning and re-oiling you should be safe.

This is what I'm still trying to work out from this guy...I have never had a problem with the oiled filters, and have never come across any dramas with them in my own use or others...

[Blitzen]

Not everything will completely burn in combustion you still get ashes, if everything would be burned off you wouldn’t need DPF box on the diesels and you wouldn't see blue smoke or black smoke from the exhaust pipes.

If you are not getting a complete burn, and start getting particulates on a Spark Ignition engine your Catalytic Converter will clog up very quickly.
This Blue smoke is the result of the oil being burned(although not always a complete burn) in the combustion process....
White smoke is unburned fuel(you can see this in good effect on a 2 Stroke Diesel engine that has broken a Blower Shaft)...
The DPF is required as a result of the Diesel combustion process, as these particulates(predominantly Carbon and Oxides of Nitrogen) have been burned as far as they can.

Although, I still don't understand how one type of filters oil will clog a LAMBDA sensor and the other wouldn't...The way I see it is that if one oil will do it, and another won't, why wouldn't engine oil clog them too??

Edit:
Sorry Transporter, just read your profile... You would know all of this already.

[Transporter]

If you are not getting a complete burn, and start getting particulates on a Spark Ignition engine your Catalytic Converter will clog up very quickly.
This Blue smoke is the result of the oil being burned(although not always a complete burn) in the combustion process....
White smoke is unburned fuel(you can see this in good effect on a 2 Stroke Diesel engine that has broken a Blower Shaft)...
The DPF is required as a result of the Diesel combustion process, as these particulates(predominantly Carbon and Oxides of Nitrogen) have been burned as far as they can.

Although, I still don't understand how one type of filters oil will clog a LAMBDA sensor and the other wouldn't...The way I see it is that if one oil will do it, and another won't, why wouldn't engine oil clog them too??

Edit:
Sorry Transporter, just read your profile... You would know all of this already.

I'm with you on that. I don't understand it either.

Too much of oil on the foam air filter can cause trouble to MAF sensor and not to OXY (Lambda) sensor. On engines with 200,000km plus it still would be the oil from the worn out piston rings, oil passing through the worn out valve guides and valve stem seals and not a little bit of oil from the properly treated foam filter.
Wouldn't it.

[Blitzen]

On engines with 200,000km plus it still would be the oil from the worn out piston rings, oil passing through the worn out valve guides and valve stem seals and not a little bit of oil from the properly treated foam filter.
Wouldn't it.

Damn straight...

[3Putt]

Have you guys considered that it may not be the oil that clogs the sensors, but the biproducts of burning the oil that does the damage.

If you have complete combustion of a hydrocarbon, then everybody is happy. The biproducts are C02 and water. I doubt they can do any damage to anything.

But the minute you start trying to burn anything fancy you start getting nasties in your exhaust.

This may be what these guys are talking about. Who knows what kind of 'oil' is in these 'oiled' filters?

[Vicbitter]

Anyone fit the bmc filter on the tdi?

[Transporter]

Have you guys considered that it may not be the oil that clogs the sensors, but the biproducts of burning the oil that does the damage.

If you have complete combustion of a hydrocarbon, then everybody is happy. The biproducts are C02 and water. I doubt they can do any damage to anything.

But the minute you start trying to burn anything fancy you start getting nasties in your exhaust.

This may be what these guys are talking about. Who knows what kind of 'oil' is in these 'oiled' filters?

Pity he didn't say more about it. Except, "why don't you put motor oil on the foam filter?" "Like we all do".
I still don't know who is it "we all".

There are more than 20 after combustion byproducts, which could be measured with modern gas analyzers today.

[macdoc]

Apoligy

I first must apoligise to anyone I may have touched a raw nerve about aftermarket airfilters. I will retract everything I have added to this thread.
If anyone still not happy, contact the operator of this website and delete the posts that I have put up.

I thought I was trying to be helpful, but its obvious that others don't agree with my input, and I don't want to start any conflict. Any information that I know about airfilters, good or bad I'll keep to myself.

Macdoc - mechanic of 16 years. (petrol engines)

[Transporter]

I first must apoligise to anyone I may have touched a raw nerve about aftermarket airfilters. I will retract everything I have added to this thread.
If anyone still not happy, contact the operator of this website and delete the posts that I have put up.

I thought I was trying to be helpful, but its obvious that others don't agree with my input, and I don't want to start any conflict. Any information that I know about airfilters, good or bad I'll keep to myself.

Macdoc - mechanic of 16 years. (petrol engines)

As for me I don't think that you needed to apologize, it is the discussion forum after all.
If you have more information about that the special oil from foam air filter causing any harm to the engine sensors you should share them with others in here, it is the purpose of this forum.
The bold statement: "that you see many worn out engines which were fitted with foam air filters" and that the foam air filter is responsible for that, might not be enough for some (since it is possible that the engines were worn out because of something else than the foam air filter and the sensors were damaged by something else).
It is logical that the questions would follow.
Please, don’t see it as I’m attacking the topic again, I’m not, and as I said before I'm not defending the foam air filters also. I think that the OEM filter is the safest option for the engine. The K&N filter doesn’t provide enough filtration for me and I wouldn’t recommend it to anybody.

[Blitzen]

No need to apologise, I never do because it is never worth it. I just still want to know why you would use engine oil in a air filter, and I'm still curious to know how foam filter oil will clog LAMBDA sensors as opposed to cotton filter oil.
It was these comments that threw me, and they still do.