Break-in Period

iluvmytdi · March 2nd, 2003, 00:01

Forgive me if this is in the FAQ, but I didn't see it. Is the break-in period for the Jetta TDI different than a regular Jetta? The owner's manual seems to cover all Jettas and not specifically TDI.

I plan to make a 5-hour interstate trip next weekend, at which time my odometer will be approx. 400 miles. So--am I good to go or what?

Drivbiwire · March 2nd, 2003, 00:24

Rules that apply for the life of the car
-When the engine is cold (below the first 3 white marks at the base of the temp gage) rev the engine to at least 2,500 rpms.
-When the engine is warmed up (above the first three white marks) Rev the engine to no less than 3,000 rpms.
The reason for this is to keep the turbo on boost, clear the VNT guide vanes and apply firm pressure to the rings for optimal sealing against blow-by gasses. The rings need the boost to seal since its a turbo charged engine, babying the engine is detrimental and will lead to issues with compression if done so for very long.

First 1,000 miles
Keep rpms below 3,800. Avoid steady rpms. Frequent firm application of power is strongly recomended up to 3,800 rpm. Avoid the use of cruise control so that you naturally fluctuate the power with your foot.

1,000-5,000 miles
Use the full 5,100 rpm power range. Avoid steady rpms. Avoid the use of cruise control. Frequent application of full throttle is recomended to help seat the rings. City driving is ideal for breaking in a TDI due to frequent stops and acceleration. Once you get to 5,000 miles change the oil and perform your first service per the manual

5,000-10,000 miles
Use of the cruise control is ok at this point since most of the initial break in has occured. Continue to use occasional full throttle accelerations to continue to seat the rings. You will notice the engine become slightly louder during this phase due to less friction from the engine breaking in (normal for a diesel to become louder under lighter loads). If your going on a long drive and you are using the cruise, every so often step on the peddle to accelerate up about 20 mph then coast back down to your preset speed.

10,000-60,000
This is when the rest of the break in occurs. The engine from the factory will check out with about 475psi of compression pressure out of the crate. It will take at least 60,000 miles to reach the peak pressure of 550psi. For the most part once you get to 10,000 miles your compression will be around 510psi meaning that most of the break in has occured.

60,000-the life of the motor
The engines I have seen so far using a 5w40 oil are maintaining 550 psi of compression pressure with over 200,000 miles on the odometer. The owners have followed the advice above and do not have any oil consumption issues. This also means that with the higher pressure the engine is more efficient returning optimal fuel economy and reduced smoke output.

DB

whitecloud · March 2nd, 2003, 04:51

Excellent answer DB. This was the best "break in" description yet!

iluvmytdi · March 2nd, 2003, 10:07

Thank you! Very helpful!

tdiScott · March 4th, 2003, 16:21

I also thank you. I'm at 1400 miles and already broke the rules by using cruise. In fact, I probably should not have driven the car from Sacramento to LA at 400 miles on the odometer -- too much consistant speed.

Thanks for tips now, hopefully I'm not too late.

Scott

iluvmytdi · March 4th, 2003, 19:50

So can I make a 6-hour trip with 400 miles on the odometer, just vary my speed and avoid cruise control?

tdiScott · March 4th, 2003, 21:38

My mistake was using cruise, though I did wait until after 500 miles. During my commute lately, from 1000 miles through 1500 miles I have almost stopped using cruise and I am trying to follow that schedule above.

That appears to be a good guideline - I was babying my a bit much, and I have been more apt to rev it up a bit more lately.

B100 · March 5th, 2003, 19:16

So, have people broken in their new TDIs on long trips? Sounds like not the best idea, unless you want to look like a doofus on the freeway, speeding up, slowing down, speeding up, etc.

Our build date is March 14, delivery by end of month. I am hesitant to take it on a trip to Flagstaff and back, I'll get better break-in just leaving it here and then driving it in the City and the hills, hills, hills. OTOH, I can find a route from here and back that has the least amount of Interstate and favors the kinds of backroads I would usually take with the motorcycle. Any comments?

iluvmytdi · March 5th, 2003, 20:11

Oh well I guess I'm going to look like a doofus. My family is 6 hours away and I haven't seen them in a month. I wanna go home, and I wanna go in my TDI! It's my TDI and I'll break it in on the interstate if I have to. Not exactly ideal conditions, but the first 400 mi. have been all city, no highway. That's gotta count for somethin', right... Right?

lojasmo · March 6th, 2003, 04:12

Just like you said iainiah. Take the back roads, you'll be fine. OR just go ahead and look like a doofus Just make sure nobody's around when you do you 60-100 runs.

weedeater · March 6th, 2003, 05:21

Just go from 5th to 4th. That'll change your RPMs.

MITBeta · March 6th, 2003, 05:29

When I took long highway trips during the break-in period, I varied my speed around the average, so if the average speed was 70, I'd go from 60 to 80... I also used the above mentioned downshifting technique at the lower speeds to get the tach up to 3000 or so for a few minutes...

I, too, used cruise control coming home from the dealer (only for about 10 miles...) before reading the manual. But I don't think you'll find anyone who's had any problems due to improper break-in technique... but then again it might not show up for 250k miles...

Jimbo70 · March 6th, 2003, 05:55

This is great info, and definitely NOT covered like this in the owner's manual (which someone in a different thread berated me for asking and not reading). I've been "babying" the car, keeping revs below 3000 RPM as much as possible. Luckily I just broke 700 miles, so its not too late.

OneBadBug · March 6th, 2003, 06:00

Moto GS,
I would definately take the TDI by way of backroads more suited to motorcycling. Who who would want to drone on and on down the interstate in ANY vehicle?

It's all about the journey, man, not the destination.

fallingwindows · March 6th, 2003, 06:31

There was a very interesting article in Cycle World a few years back about breaking in engines. They bought 3 identical brand new sportbikes and broke them all in differently - one completely by the book, one they beat on hard from start one, and the 3rd I can't remember. After a number of miles, they tore apart all 3 motors. Upon microscopic inspection, component wear was essentially identical among the 3. Granted, these are high-strung, high-revving tiny gas motors, but it was a very interesting article....

That said, I'm still looking forward to my next TDI, the 136hp 6 speed A5, brand new, and I'll be by the book for the first 10k! It'll just satisfy my OCD so much more....