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Q: Will you suggest to get a replacement engine? I have a blown head gasket for BMW X5 on 2001 BMW X5

Couple of days back there was some burning smell in my car. The heat indicator didn't show any overheating (the needle was right in the centre). I stopped checked everything but found nothing. The next day when I drove my car about a mile, there was very heavy white smoke coming from the exhaust. I stopped and turned my car off immediatley.
I got it towed to a mechanic who told me that he is sure that it is a blown head gasket. He called me later on and told me that it will be very expensive to repair the blown head gasket and he wont guarentee anything after that. He also told me that he don't know yet that if the head is cracked or not. He will only know that when he takes it out and do the checks. As per him, its better to replace the entire engine as in his experience there are always issues of overheating after the head repair.
I just want to get a second opinion if that's truly the case.

Will be better off at getting the gasket replaced or head fixed if its cracked or do I need to go for the replacement of the entire engine.
I will apppreciate any feedback ASAP as I am without car now and need it back as soon as I can.
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I just had the same blown head gasket problem. BMW wanted $4000.00 to replace it . It takes special tools to hold the cams in place and most garages don't have them as they cost close to $2000.00. I'm having the engine replaced with a low mileage used one.
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