Only engine mods is a K&N filter...Highway, I have seen as high as 31mpg.
I also changed spark plugs, oem bosch are not to expensive at any parts place. I changed the air filter to a K&N, I am running motul diff and engine oils now.
Just arrived from ECS, I installed my smoked tail lights on my '08 wagon. Has the Euro version rear fog. When signaling they change from red to amber when blinking, unlike the US version is always red. And the internal housing of the lights that are normally chrome are blacked out. Love'em.
You get a few more MPG and with the windows down you can hear the turbo a little better.
You'd have to have the oil really dripping off the filter for it to get sucked in. K&n have done testing , and they couldnt get oil to come off the K&N even when they over oiled it, and even when they did get oil on maf's they still worked fine
about 35 mpg freeway & about 27 city/freeway daily driver '89 Jetta 4 door 1.8L originally (bored .020 over) on digi2 with a K&N air filter I'm running nothing but 91-92 octane chevron/shell gasoline.
It's not the worst mod actually, but I got ripped off by the ppl who sold it to me (I paid nearly $90 with tax) because I didn't know how much it was worth... no gains whatsoever and that's what upset me. However, I did forget that I won't have to pay for another air filter for the rest of my life, so it's not so bad after all
Basically...modest if any gains involved with going with a straight drop in.....the only real benefit IMO....is that for the $60 air filter...you never have to buy another one again...that's the main benefit as far as I'm concerned.
I use a k&n and I've noticed some grit mixed in with the oil that coats the walls of my intake track. I only clean it every 40k though.
My vr6 had nothing but maf issues after I installed a k&n. I wouldn't even dream of putting a k&n in my 1.8t. The paper filters are fine. It's been proven on the dyno more than once that you get no gains from a k&n whatsoever. Unless you think you are going to clean and reoil your k&n to reuse it and save on filter costs (in which case again you have to be careful not to over oil or you screw up your maf up big time) there is no specific benefit to gain by installing one. Let me note that I've not noticed the same issues in older vw's, just mk IV's.
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