Hi,we are a new member.we not long purchased a commercial disco 2td5 and when we got it home we found the oil level very high.we took alot of oil out using an oil vac.all seemed to be ok.got a full service kit ordered.when driving home we came to pass a tractor and trailer of which we did in 3rd gear.all of a sudden a lot of black smoke bellowed out the back and the engine started to rev upwards to roughly 4000 rpm.in sheer panic I turned the key of and hastily parked in a gateway. When I opened the bonnet there was no oil anywhere but saw the coolant bottle bubbling and overflowing. The temp gauge on dash was reading just below normal running temp.got towed home as afraid to start the engine.a mechanic came out to look and tried to start the truck for it to only turn over and not fire. I have checked the turbo to find its freely moving. Have found a 40 amp blade fuse blown in fuse box by ecu (f5 I think).do hope the head has not cracked as unfortunately don't have the funds for that due to buying the truck.any help or advice would be greatly appreciated. Thanks,efrem.