Glashub

I experienced this with my Acura's. Their engines seemed to break in at around 10K gaining some torque and horsepower. My 350 IS appears to me to have done the same. I didn't notice it on my 385hp Genesis but then again that engine was divine from the get go. Anyone notice that their engine seems smoother and stronger?

dojoman

iTrader: (5)

I'm about 9k miles. I experienced surge in power right around 8k miles but then I went back to normal feeling around 9k. I wasn't sure if it was related to break-in or just different batch of gas in the tank.

theoryguy3

My engine shifts a lot better and has better gas mileage at 8.3k than when I originally purchased it

Glashub

I've had everything from 4 bangers to 12 cylinders -- so I think I'm pretty attuned to engines. Maybe it's all part of building an engine that'll 200K -- it takes 25K for it to really break-in.

IC350

IDK all the IS350 are like this but coming from 335i, i dont really feel the power and only getting 18 MPG on average . im on 5k only hopefully it gets better !!!

CJW

iTrader: (1)

The IS350 won't have the power/torque of the 335.

I'm at 4k and the car feels stronger than when I first got it.

sarcoptic

I am sitting at 5300 miles on my 350...I finally am getting decent gas mileage. I am now average 24 - 26 miles anytime I am on the highway. The engine is definitely feeling better too.

Glashub

Glad to hear that I'm not alone and not just imagining it. @ic350 -- you can lay that 335i power dream to rest for a while. But take the IS through some twisties hard and you'll totally get why I'm jazzed about this car. Also, 18mpg is about what I get -- but to be fair -- I'm never in eco and always in sport or sport+ -- or at least a lot of the time.

drbazing

Well that's something to look forward to, MPG-wise. I only drive city and I get 16-19 MPG, but the good thing is that work's only 4 miles away. I gas up usually every 2.5 weeks.

goshawk823

IS350 AWD here. Just rolled past 1100 miles, and I'm averaging 23.4 on my work commute, which is 90% highway and about 21 miles each way. I'm loving the handling and performance so far. This is driving in "normal" mode, which is pretty damn responsive to me.

TheShaddix

Also coming from a 335i here. The new car is amazing in many ways: it's sharp, it's gorgeous, and the interior is on-point, but one thing it falls short on is the engine... The whine, the weak torque, and not really getting any mpg worth writing home about - those are the things most people can live with. But this is definitely not the car for someone who's had a turbo car before as you get spoiled by that for life unless you replace it with another turbo car, or a V8.

But more on topic, the car does get a bit smoother over time. Another trick not many know of is, when you downshift, let go off the gas completely before pulling that paddle. It'll downshift smoothly and actually faster too.

drbazing

If there was an actual market for major engine upgrades, I would gladly participate. I'm not aware of any as of now. Maybe then I could rock that "LOL 335i" license plate.

AdvanSLF

this power surge which everyone is referring to may be plausible as the car ages. i know that mpgs gets better as you hit 10k, 20k, 30k, 40k, and starts to even out there. this could also be true too to the power. on the other hand one could theorize that its about consistent experiences. so for instance your first few thousand miles i'm sure you rationalized that you needed to baby the hell out of the car.. in the spirit of whatever moment, you had a weakness and floored it WOT. you got that good boost going through your veins but stopped and didn't do it too many times. but each time you did floored it, and as mileage increases you felt that there is this power surge revelation. keep doing it often and the same theory will apply where things will start to even out. so in a nut shell, you didn't do it a lot before so you didn't notice, but do it more often and you see this unforeseen power, not do it so much that it becomes for a lack of better word no longer as life changing. you got used to the power essentially.

mark168

My is350 is doing better mileage and the engine runs smoother after 10,000 kilometers. I use to average hardly 5kms/liter on city driving. Now i can easily do 6.5kms/liter on city driving. Have not driven it lately on the highway. Hopefully it can go over 10kms/liter.