Can K&N air filter oil harm injectors or fuel sensor on 2009 Jetta TDI 2.0?

Question 1
Can K&N air filter oil harm injectors or fuel sensor on 2009 Jetta TDI 2.0?...  I just got a 2009 VW Jetta TDI (2.0) and have a question about putting a K&N air filter on the Jetta. My brother had some concern that the oil that you spray on K&N air filters can harm some diesel injectors, and he thinks this might be one of them but not sure. I did some research and found a few people say that the oil gets on some fuel sensor and can harm it. I had already ordered it before I found this out but have not put it on yet. I was wondering if anyone knew more about this or has any advice for me on either subject, the injectors or fuel sensor. Thanks in advance.

Answers
1)   ~ - Dri

2)   NO it won't do any harm unless you over oil it after cleaning it. Clean it let it dry then oil it then let it sit for a bit on a paper towel or other absorbent material. We have two 2005 Ford F350 tow trucks running the filters on the powerstroke motor with almost 90k on each with no problems so far and they have been running the filter since new - poecilotheria metallica keeper

3)   just don't overspray the filter with oil after you clean it and you will be fine, follow the insturctions and just spray it enough for the filter material to get some red color back - Camaro Hopper

4)   They can damage MAF sensors (located in intake tubing right after the filter). CRC MAF cleaner will clean anything on the sensor. Don't know much about diesels. Personally, I believe that K and N air filters are a gimmick but that's a whole other story. - Fribble

5)   Geez, the endless stories I hear about problems with German cars is ridiculous. Of course you're going to have issues installing a K&N filter in a Jetta. The cars are so over-engineered that the slightest upgrade will cause malfunctions to the electronics. There's a saying about German Automobiles. " The more they (Germans) over-think the plumbing, the easier it is to stuff up the drain". Now you're stuck with an over-priced VW and the headaches that go along with them. - Andziusia

6)   If you do not over oil, then no oil will get on anything and there will be no problem.
If you do over oil and it gets on and mass air sensor, you should take it off and spray it with brake cleaner.
So not spray it in place, because you don't want brake clean in the engine. - Motorhead

7)   This is Such a Great Question.

I sincerely appreciate you asking this. I too had difficulties for a while finding a reputable source for parts for my '97 Ford F250 that were not remanufacutered parts or in poor condition. Finding the right auto part for your diesel truck, let alone at the lowest pricem is quite a challenge. I tired a few places online, but typically wound up returning everything i bought since it did not fit or was in bad condition. However, I have had great success dealing with WCP Diesel. These guys know their stuff. I think they could help you find what you are looking for.

Best of Luck! - Reese Shaw

8)   As someone with 3 TDIs in the family, a 97, an 01, and a 2010, you do NOT want to use a K&N on a diesel VW, or any VW for that matter. The intake system on the new TDIs already flows as much air as the engine can possibly use without other upgraded components. Basically a K&N will gain you absolutely NOTHING while reducing filtration and running the risk of oil coating and ruining the MAF. MAF cleaner is great.. if you catch the oil before its too late, unfortunately, unless you're sitting there with a laptop hooked up in your car constantly reading MAF numbers, you won't know it's going out til it's completely dead.

Return the filter and save your money for something else. - Richard R


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Question 2
I am thinkg of getting a 1981 diesel rabbit, and everyone is saying there super slow, are they all that slow?...  

Answers
1)   yes - megan480

2)   It all depends on your definition of slow. Compared to cars nowadays, sure they're slow. Compared to a gas '81 Rabbit, is a little slower. What 20 year old car is quick for today's standards? (except a small few). If you wanted quick, you shouldnt look at a 20 year-old four cylinder diesel car anyway. Reliability and economy would be the key. - kinghielo

3)   It was one of the slowest accelerating cars on the road when it was new in 1981. Cars, of all makes and models, are significantly faster in 2011 than in 1981. Speed limits on open highways are also higher today than in the 1980s fwiw...

You'd definitely be driving the slowest car on any road if you drove an '81 Rabbit diesel in today's traffic. It might literally be scary trying to merge onto a busy 65mph freeway in an '81 Rabbit diesel today given the relatively short length of some on-ramps. If you're OK knowing it's going to be pitifully slow, you will be rewarded with really good fuel mileage though, even by today's standards. - Ben Linus

4)   the best advice i can give you is DRIVE IT FIRST then decide if you wish to buy.
true story: i pulled out on a road in one of these and was nearly smashed by lawn tractor [this particular car was a special mpg model that had a very "fuel friendly" final drive gear ratio. normal 0 to 60 times were measured with an egg timer but the customer sweared it would get 60 mpg at 45 mph constant speed
while alright in there day these cars came with many problems, a short sample follows:
water leaks on to fuse Panel corroding terminals and shorting relays
the lift pump made on the drive end of the injection pump [pump shaft wear and shaft seal leaks combine to form an air embolism stopping fuel flow]
engine and transmission mounts, as car ages these rubber parts harden and the car becomes a horrible rattle trap.
shifter bushing wear, v.w. stopped producing repair kits for this years ago. some parts are available from the aftermarket but i have not seen a complete kit in years
except for the valve cover these stayed fairly dry but always the valve cover leaked.
kiss of death engine [if timing belt broke an expensive valve job was necessary]
note: most of the guys that worked on these have retired, going to a shop for a proper timing belt job requires a couple special tools if you can find a mechanic that knows how to use them.
good luck on your decision - hobbabob

5)   they are insanely slow. I rode in one for a while back in the 80's and could not believe how little power they have. - Doug W

6)   They are not slow they just take their sweet old time gaining speed and dont like hills. My 1980 diesel Cadillac will do 90 mph easily. Its going to take forever to get it to 90 even if I was already going 85 and no way its doing that up a hill. It can be pretty annoying to drive it in modern city traffic especially if you are used to a more modern or high performance car. Power to weight ratio the rabbit may actually be better than my caddy. My caddy weights 5,000 pounds and only kicks out about 105hp. You have to remember a early 80's Corvette was only in the range of 150hp and the Turbo V6 Buicks were the fastest cars you could buy in America. - doornobk

7)   I made my husband sell his rabbit because it looked like a death trap to me. (Just my opinion) Plus diesel fuel here is 3.29 a gallon already. Unless this car is an awesome deal and in really good shape look for another car. Diesels can be a money pit. - venshore

8)   they are slow to accelerate, but should have no problem running with traffic when up to speed. They are also maintenance intensive...make sure that the oil was changed RELIGIOUSLY! This is a car that the oil has to be changed and not ignored or you could have major problems with the car. This is definitely not a race car but very frugal transportation. - frdafury


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Question 3
is a Volkswagen Jetta a good car to invest my money in?...  so, my sweet 16 is coming up, and I get to spend up to about $7,000 on a used car for me, so i was wondering if a Volkswagen Jetta is a good car? I really think their so cute, for my age, and not to expensive, also, any links to dealers that seel them for cheap would be great! i live in the seattle WA area. lastly, how many miles should i look at when i buy a used car? like whats too many?

Answers
1)   Anytime I am in question for anything, I do a google search for consumer/owner reviews. This way I feel more at ease since the reviews are from people like me and you. I don't go to the 'brand site', say for example Volkswagen. Of course the information there is most likely to be bias. Good luck! BTW, check carmax or for sale by owner. - LindaR

2)   I have a Jetta TDI (diesel) and really like it. I drive a lot of miles though so I wanted something that would get great fuel mileage. I get about 43 driving to college, it is about 30 miles one way though. I think it is a good car but I haven't had it that long. I found mine at autotrader.com, the usually have a good selection. Carmax.com is also good. One concern is driving them in the snow. I don't know if you get a lot of snow or not but I don't think they are great in the snow, not horrible but you could probably do better there. But overall I like mine. Hope this helps. - Josh

3)   The car is utter garbage. After one year of owning my brand new Jetta, I had to fix the following problems.
-Radio antennae stopped picking up signal. The dealer had to remove the roof lining and replace the antennae wires.
-The hood release latch fell off.
-The electric trunk open latch failed. The trunk would not open even if I tried to use the key.
-The Climatronic system failed and I had no control over cabin temperature.
-The lights began to flicker
-Headlight and taillight bulbs burned out
-Mass Airflow sensor failed
-The plastic covering the seat-belt height adjustment fell off.
This car was my worst NIGHTMARE. - Andziusia

4)   No car is ever a good investment.
Unless you are a mechanic, you will always lose money on a car.
The only thing you can do is to get the travel you need out of them, with the least wasted expense.

And the first thing is to not buy from a dealer.
Always try to buy from a private party, and have an independent shop check the car out for you.
Even is they miss something, it will still cost less then buying at a dealer.

I also would not suggest spending much on a first car.
Think of it as a practice car, where you are going to make mistakes.
You will learn not to park where it will get dented, remember to check oil, etc.
The first car always get beat up by new owner mistakes.

As to miles, the degree of maintenance is more important. If everything is done correctly, than any car can last forever with no problem.
The problem is that after about 200,000 miles, most people don't care any more because they want a new car anyway, so they let the maintenance drop.
But then the number of miles on a car still do not prevent buying it, just change the price, because of the maintenance that has not been done, could pile up and cost a lot all at once.
With a low miles car, they cost more because there just is not much an owner could have done to screw it up. But a well maintained car with high mileage is actually a much better deal, if you can tell it has really been maintained or not. - Motorhead

5)   You also should compare car insurance quotes for cars before buying one, for example here - carquotes.fateback.com - Tom


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Question 4
Can you ever redline at top gear?...  Can you ever redline at top gear in a car? Is it possible and if it does should i slow down? i'm a noob to cars and engines and stuff. but i'm very interested and curious. I wanna be a gear head not a ricer. lol

Answers
1)   some cars have a rev limiter that kills the engine if over revved. without one you could blow the engine. - Mike V

2)   Depending on your gear ratios you can, but the lower the ratio the slower your top speed would be. It's hard in stock car because as your top speed increases the air resistance also increases and makes it difficult to achieve redlining because of your engine's power output. Hope this has helped you understand!

All the answers i have read here are all true, makes me laugh how the un-educated will always give the thumbs down! - Aaron

3)   Some can and some cant. Most modern cars are electronically limited or drag limited (doesn't have enough power to overcome the drag and go faster. Some Porsche's run short enough gears that the top speed is limited by engine speed not drag.

Doing it for a second or 2 wont hurt it if your engine is in good shape. Driving around at that engine speed will cause your engine to wear out faster. - emiller1998

4)   My 87 GTI16V and my 92 GTI16V both would redline at 124 and 120 MPH in 5th gear, bouncing of the rev limiter.

Haven't found out with my 2003 GLI, I will ne of these days- 160 MPH predicted

ASE Cert Auto Tech, 2003 GLI - sci

5)   What an odd question.
There is always the same reasonable operating rpm range for the engine, no matter what gear you are in.
It is always bad to lug at too low of rpm or to over rev.
You should never approach the redline, because that is a definite damage limit, not the reasonable limit of where you should stop. The reasonable limit is much lower.
In most cases you should run from between 2800 and 4000 rpm.
Some engines, like motorcycles and rotary engines should be reved almost twice that.
And some truck engines should be even lower rpm.
Diesels also have a more limited range.

But depending on final drive gearing, it may be impossible to reach the redline in some cars, in top gear. There may not be enough power to over come the wind resistance, to go that fast.
But you can lower the gear ratio with smaller diameter tires, and then be able to rev higher.
Trucks have much lower gearing, so reaching redline in top gear is relatively easy.

The reason you should never lug is that the engine won't dampen vibration properly, and the oil and water pumps don't put out enough at low rpm.
The reason you should never over rev, is that the centripetal force of the pistons against the rod bearing is too great for the oil, and because the valves do not rest long enough to cool properly.

Not sure if that answered it because it is sort of an odd question. - Motorhead


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Question 5
i'm restoring a `61 VW beetle. and i just cant pick a good color ,any ideas?...  original color was baby blue-ish but i want to make it stand out cuz im 15 and ive been working on it , its gonna be my first car. so just throw out some ideas . im open

Answers
1)   i like 2 or more colors, all over it.
a light color on top and darker colors going down. is good.
this will help keep the car cool in summer.
and copper metallic is good. one of my favorites.
also any color in metallic flak. - SUPER GREG

2)   bmw helrot red - electricman2170

3)   look at the Mini Cooper two color paint you might get some ideas - pickmefirstplz

4)   go through Hot VW mag for some cool thoughts.

as for me, I would keep the shade, but go with a metal flake or a neon green. - wi_saint


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