2010 caddy ..lost all the engine oil as the engine light come on I popped the bonnet and on left hand side were coolant bottle is oil all over left side and large puddle on the floor?What could it be

All I can suggest is to go in through the wheel arch. SAFELY jack the car up onto axle stands. Remove the wheel on that side. Remove the wheel arch liner. You should be able to see how to remove the bottle from there. The leak might just be a loose pipe or a loose washer pump/motor so check those first.

The Astra has been around since the late 1970's and has gone through many changes since then and there are also territorial and performance/trim level variants to consider. The vehicle handbook is the place to look for information specific to your model though if the bottle has a screw cap it is probably the coolant reservoir/coolant expansion bottle/cooling system degassing tank...

You may have a blown head gasket.

The 2010 v6 has a power steering dip stick below the engine cover. Take off the oil cap, grab the plastic engine cover on each side and lift it off (it snaps off and on). Put the oil cap back on so you don\'t lose it. You will see the power steering dipstick at the top of the engine. This only applies to the v6. Mine was loud, and I added a bit of fluid and it was fine.

It is located on the drivers side in front of the engine dip stick (yellow) along the front frame where the bonnet closes against with a blue plastic cap, this is on a right hand drive model. If it is missing your vehicle may have been involved in an accident and as with a lot of Australian vehicles, not repaired properly (why the government has change laws on smashed vehicles)!!!

i thnk its the cartridge oil filter head ,but not entirely sure without my greasy hands under the bonnet

inside the radiator bottle is the sensor, alot of times can fix by removing bottle and rinse out up side down with garden hose, if don't fix then would have to replace bottle

If this is a red flashing light beneath the temperature guage it means that you do not have enough coolant. Top up the large white ball shaped reservior at the right hand side of the engine compartment just behind the battery.

coolant level warning light

There are two release catches about 15" to the right and left of the centre safety catch. Roughly at each end of the top of the radiator.

The bonnet release cable goes first to the right hand one then there is a wire from that to the left, in a daisy chain way. They are typically French, cables fit into plastic levers ( a bit like bike brakes) not metal which break easily. replacements are not cheap. You need to be able to pull the cable to both catches to get the bonnet up. I managed to do this from underneath. In my case the, left hand one was broken and right hand one was working, but the getting it open broke the bit that that pulls the left. Managed to away with buying just one new catch as they are identical, swopping the right partly broken one over to the left side.

HTHs