Being in the same boat as you, I too have a Chevolet Sail Tcdi which i bought in the year 2013 - the only difference is that i have been able to drive it upto the 2 Lac KM mark, and would be crossing this mark shortly.
I want to ask you one thing, why not use the Chevrolet authorised Service stations for the car's service and maintenance. In all these years I have always relied on the chevy ASS and they have never let me down.
Close to 2 Lac KM, I have always got my car serviced religiously at every 10000Km and apart from running repairs, the car hasn't asked for something out of the box - even the clutch remains unchanged.
I was thinking that I will be able to drive this car upto atleast 3lac KM, but NGT ban in Delhi NCR has really screwed those plans, althought the car is in great shape but will have to part ways in coming months - Sad but true.
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Unfortunately, my experience with the Chevrolet ASC had been so poor.
The car had to start issues from the time of purchase and it had to be towed to the service center 2 times. They didn't fix it both times and it used to pop up every now and then and used to get solved by itself.
No error codes, or any other obvious faults but the car simply doesn't start as if there is no fuel. They even changed the fuel pump under warranty but it was useless.
It was only after some 6 or 7 years of ownership and regular service at Chevrolet ASC that they found out that it was a 300 Rs relay that was causing it. I felt so stupid for not going outside the ASC, any competent mechanic would have found it way sooner! I spent tens of thousands on towing just because of this!
They used to overhaul the brake system on every yearly service claiming it's a standard procedure! And they messed up something while putting it back on and the whole brake system on the car failed. Those people made me change the whole braking system excluding brake lines. That's master cylinder, all calipers, disc, drums, booster what all not! These are all stuff that has a very low probability of failing and yet they managed to screw that up. Whatever they haven't touched in the car is all fine and working well.
They used to fill some random oil in the car and used to bill it as Total Quartz 7000 5W30. I always had a doubt about it since it felt thicker than what a 5W30 normally is. The engine was also very lethargic to rev and felt as if there is some restriction.
Throughout our 8 years of ownership, we drove the car like this and thought it is how it is. It was impossible to perform an overtake in this car and it felt as if it was some 30 bhp car. ASC always said this is how it is from the factory.
It was sort of the same feeling I got when I filled thicker engine oils in my bike. As described in this thread, for the first time, I bought my own 5W30 oil and changed it outside. I felt a huge difference after this, The vehicle is more silent, revs faster, and it's more punchy and fuel-efficient. We were surprised by how this car performed after that. Even my father couldn't believe it and he regretted taking the car to the ASC till now. Can you even think about the pain we had to live with such a low torque crappy car for 8 years which we used to hate every time we stepped on the gas? So awful! I hope no one goes through this ever!
The service center also has this change the whole part mentality rather than changing the individual part. Asked me to change the lower arm since they don't sell lower arm bush!
This was enough red flags for me to stop going back there. I am glad that it's working out well for you. But sadly the ASC near my place is pathetic.
For the first time in 9 years of ownership, we enjoy driving this car! Only because I decided enough is enough and took it outside the ASC. I have no regrets and I will never go back to the ASC again!