Quote:
Originally Posted by RPM90
I don't see ANY reason to treat a leased car any differently than a loan purchased car...I never understood why people would abuse a car that is not theirs...
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My sentiments exactly... I cringe every time I read someone's comments to the effect that they couldn't care less about abusing it because it's a lease.
Quote:
Originally Posted by RPM90
For the record, I don't do soft, gentle, or slow break in.
I consider the BMW manual method to be a slow and gentle break in.
The only thing I don't do for at least the first 1000 miles is no standing WFO throttle starts red lining gears through a 1/4 mile run.
My engines see red line well before 1000 miles, but the engine gets there in a controlled steady manner using light to moderate throttle.
I use and hold each gear steadily to red line and then let the throttle off letting engine braking bring the rpm back down to around 1000rpm, then the next gear, so on, until I can't use the higher gears to red as speed would be too high.
The idea is to let normal engine braking and vacuum full set the piston rings so that compression remains good for life with minimal blow by of oil into the combustion chamber or fuel into the oil.
No need for slow and gentle break in, IMO and experience.
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Quote:
Originally Posted by NISFAN
I am an advocate of the 'ring seal' run in. But I used to race bikes so could see the benefits.
The soft break in method is a little old fashioned, stems back to older machining techniques that left rough surfaces that required 'bedding in'. There were surfaces that potentially broke through the oil film and caused metal on metal contact.
Todays modern engines are machined to a much finer tolerance, and have both improved oil contol and oil technology. So the old 'bedding in' process is no longer important.
For most manufacturers new engines are run on an engine dyno and then again in the finished car on a wheel dyno.
They test for power on these tests, as it is the best engine 'quality check'. So in truth that engine you are babying started life running at full power within a few minutes.
So why the manufacturers running in guide?
A new car is not just a new engine. Brake components need bedding in, tyres need the release agent scrubbed, clutch discs need bedding, etc so it is common sense to drive well within the limits of the car until these systems reach optimal performance. This if done correctly only takes 50 miles max.
It is not difficult to imagine why a car manufacturer might recommend a running in regime. Theses reasons have little to do with mechanical sympathy.
At the end of the day, it is your car, and whatever method sits well with you is the best method
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This approach is starting to make sense to me...
Typically, I have taken it easy, varying revs and speed as much as possible for the 1st 500 miles or so, then gradually adjusted to full attack mode over the next 500 miles. But it sounds like it would be best to incorporate an initial ring seal process at the outset.
Anyone have any advice specific to M Sport brakes? e.g. Do they require the same bedding process that Brembo recommends for their BBKs?