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Look for the transmition dipstick. It should look like a T pressed into a hole. Pull it out and check the level of the fluid the same way you check the level of the oil.
If your 330i is a 2006 model or newer, it does not have an oil dipstick. Otherwise, check the oil dipstick for oil level.
More than likely 5w20. Check your owner's manual or look on the oil fill cap. any major brand oil is good. I personally use Pennzoil which is my choice.
16.6 US Fluid oz of SAE 10W oil, and 19.5 US Fluid oz if completely disassembled and dry.
On the bottom of the oil pan, look for the large bolt.
The type of oil you put in a 2006 Saturn Ion should be 5w30 synthetic oil. However, it's always best to check the owner's manual for the preferred oil.
on the bottom of the oil pan look for it
You can't it is a sealed for life unit. Your GM dealer can check it if you have a leak.
There should be a dipstick like the one for oil. Check with engine running.
The Check Engine Light has nothing to do with oil changes. It is on because the ECU has detected a problem with the emissions system.
BEHIND THE OIL PAN, PASSENGER SIDE. look up, it's short
It's on the bottom of the oil pan, just look for the large nut on the oil pan.