Motor Done Again... Need Answers?!?

[b4christ15]

Well, after having all my valves replaced, new seals, and a multi layer head gasket installed back in November I figured my car was good to go as far as maintenance. About 1000 miles of driving after getting her back I noticed my oil light was flickering on and off and my dipstick was dry as a desert. I decided to head down to my local auto store and pick up 3 quarts of mobil 1 synthetic (what i've been using for all of my oil changes) to add. Well, it ran fine for about 300 miles. Then, on Christmas Eve while I was doing normal around town at 30mph driving I pushed the clutch down to change gears and the rpm's dropped to 0 and the car died. I coasted into a spot and started her up again. Now, before I started on my trip I noticed the car had a very low idle on startup but other than that everything was fine. The car would go into gear and when I would try to get her moving it would die. I left her in the spot and walked it home The next day I went back and noticed after starting up the car a very loud knocking noise that got louder with an increase in rpm's. I had it AAA'd to my house. A week later I had my mechanic look at it and gave me the bad news. Apparently, he never has used synthetic on my car (which I though he told me he did) and told me that the mix of regular oil that was in my car from the head rebuild and the synthetic I had put in earlier had caused the block to go bad. Now, is this the real reason or is he hiding something from me? He had done my 6 bolt swap back in June. I did a search on mixing the 2 different oils and had come up with the opposite of what I was told. I really am in a bind here and have the car for sale. I'm debating fixing it but after all the shit luck I've had i really don't want to deal with it again. Sorry for the long post but i just need some real answers and opinions on what I could do? Thanx for all the help - Blaine

 

[nukefission]

Sounds like rod knock, although I dunno if mixing the two oils would have been the cause so late in the game. I would suspect an assembly or engine break-in error. Who built the motor?

 

[b4christ15]

The motor isn't built or anything. It was just a used 6 bolt with "40,000 miles" but thats what everyone says so I really dont know. As far as break-in, i asked my mechanic after my head rebuild and he said take it easy for 500 miles, which I did. So I don't know about that.

 

[Duke901]

mixing the two oils together would not cause the motor to die. Something else caused it.

 

[b4christ15]

mixing the two oils together would not cause the motor to die. Something else caused it.

Is there any way I can prove this to him? Also, anybody have any ideas of what did cause it to die?

 

[Duke901]

Are you sure the motor had only 40,000 miles, and did you see if you had a oil leak anywhere that would cause it to be bone dry on the dipstick.

 

[b4christ15]

Are you sure the motor had only 40,000 miles, and did you see if you had a oil leak anywhere that would cause it to be bone dry on the dipstick.

Im not sure the motor only had that many miles, thats only what I was told. The car never leaked oil at all.

 

[ICGerms]

Is there any way I can prove this to him?...

Valvoline Durablend

 

[b4christ15]

Valvoline Durablend

Thanx for the suggestion. Im not really sure what I should do now