I change every 5K with Liquimoli 5w-40... I'd use 5w-40 over 5w-30, especially if you're doing any kind of upgrade to performance. Car will run a heck of a lot better.. 5w-30 is to thin when working an engine as hard as most of us do.
The stock ignition coil on our Mk3 Jetta -- which we've had since it was new in 1996 -- just went out about two years ago. Typical crack causing the engine to die when going through puddles. I considered replacing it was an inexpensive Meyle coil. Decided against it, because while Meyle is a German company, their ignition coil is made in China, and I'd heard some bad things. Figuring the OEM VW coil really is over-priced, I finally decided on a Beru coil. It is made in Germany, and so far no problems.
If it helps, I can tell you that Michelin Pilot Sport PS2 235/ 40 R18 tires on 18x8 ET 43 wheels fit perfectly on the MK6. My speedo is about 1.5mph off @ 70mph, according to my GPS. No rub, no nothing, just horrible road noise from 95Y rated tires.
I really didn't think changing the fuel filter in my GLI would make much difference, particular seeing as the fuel inside the old filter looked perfectly fine. But wow, after a couple days, what a difference. I'd had some slowly-worsening issues with throttle response, particularly at low speed -- starting from a stop while engaging the clutch, or accelerating at low speed in gear. The car would bog a bit and then surge, unless I modulated the clutch and gave more throttle than I really should. Those problems immediately went away after the fuel filter change. This was at 55,000 miles. I think I'm going to have to start changing the fuel filter at about 40,000.
The only major difference appears to be the manufacturer of the sets. The ECS ones are made by Hella and the Parts4Euro ones are made by Depo. Go with the Hella.
I just switched out a set of Bosch's for the NGK PFR7S8EG's...and to me it's night and day.
tested main fuel pump >good, has a new bosch in-tank fuel pump, new spark plugs, new bosch wires, air/fuel filter, new FAE fuel pump relay.
For my 2.5 engine, with +100k miles and a turbo, ive been using liqui moly with great success. It meets the 502 requirements, and it yields great results.
From what I can tell, OEM is no longer Bosch, but Valeo, and the dealer is usually cheaper than finding the Valeos (they run about $25-30ea. New Jettas are teh same as the current audi A4... slightly narrower than the bosch 19OE and 24OE sizes.
I bought my 2001 Jetta with 80k on it. It came with a broken water pump (plastic) plus 6 belt valves and a quarter of the teeth missing from the timing belt. The pump was in about 30 pieces and the damage to the valves was do to the water pump.
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