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Your Catera has a sealed for life transmission so therefore on one of these models there is no dipstick and you cannot check the fluid level yourself. The dealer can check the level but that is only necessary if you have a leak.
Use a premium grade oil and a quality filter such as AC/Delco, Wix, Purolator, or Bosch. The correct weight oil is listed in your owner's manual and possibly on the oil fill cap or dipstick.
We found that all of the northstar engines of this era will eventually overheat and blow the head gasket (which we had replaced). The only good solution is to replace the headbolts with a stud kit ($450) and torque with nuts (like the race cars do). This has solved the headgasket, but still heats up to 224 degrees in city driving (100 degree Kansas City). ALSO you must always use the A/C as the cooling fans do not operate if it is turn to econ mode. Our fix cost us $2400, but the dealer wants $1000 more.
CADILLAC CATERA HAS 3.0 V6 ENGINE.I WOULD PUT BACK THE SAME ENGINE COME OUT OF IT.IF YOU TRY ANYTHING ELSE.YOU ASKING FOR BIG HEAD ACHE.SPEND A LOT OF MONEY ON THIS PROJECT.YOU MIGHT NOT RIDE.ITS A BIG GAMBLE.