ords

I'd have wanted before and after performance figures.

Did you ever get it on a dyno as suggested by @Schtum?

Which unit do you have in the car. Which phone?

Are the windows misting up more than usual? Any coolant loss? Do you have a sunroof?

Mine is original from Jan 2013. Has a healthy cranking speed even after not being used for a few weeks. Stop/start always enabled.

Manual or auto?

A fault should have been logged. Would that show the time and date?

Mines been faultless. What age of car are you looking to buy?

Auto or manual?

Did you find the cause?

If you do need to top up, make sure the engine is cold. If the engine is hot and you unscrew the cap hot water will escape under high pressure. With the engine running at normal temperature, look around for any obvious signs of leaks. Does the heater work correctly?

Neither does mine and looking at images of engine bays very few have it.

Yes, if you hold down the unlock button, they'll go down for as long as the button is held down. Use the lock button to make them go up.

I'd have kept the support "just in case".

I used to run my in ECO in town to get in a higher gear quickly and switch to normal on the open road as I felt more in control with engine braking etc. Now, it's in normal all the time with much the same economy and the gear shifts are the same.

Can you disable the speed warnings?

When you say revving, how many rpm? It should regen at a high idle speed of 1000 rpm.

I'm assuming it's a diesel.

I'm still on the original battery, also Varta. I've dropped from 20k a year to about 1500 miles a year. If I do not need to use the car, I'll start it up after 4-6 weeks. Usually starts on the button, but sometimes cranks for up to 5 seconds. i don't have power in my garage, so charging is out of the question.

Is it continually cranking at normal speed during those 10-15 seconds or slowing down? Any battery warning messages? In normal operation the battery will only be charged to no more than 80%.

https://www.youtube.com/watch?v=KQxfUd8_WLo

Try it, you've nothing to lose.