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Your Altima uses a variety of different oils to lubricate various components. Normally, these oils won't leak. But when you do find a leak, you will almost always need to have extensive work done on your Altima to correct the problem. However, before you can replace anything, you need to know what kind of oil it is Check for brown or black oil leaking on the ground or on the side of the engine. This is engine oil. It lubricates critical engine components. A leak means that an engine seal has failed and needs to be replaced
Check for red oil. Red oil is trans fluid. On your Altima, it most likely means that you have a rear main seal on the transmission that has failed. However, any seal on the transmission is possible. Transmission leaks need to be fixed immediately. A transmission can fail catastrophically in 20 minutes of driving if there is insufficient oil in the transmission
Check for amber or brown oil leaking from your trans. This is transmission gear oil found only on the manual version of the Nissan Altima.
Locate transmission pan ,it has a drain bold in the middle of it . drain the fluid (the fluid should be redish in color )from the transmission and then remove the bolts that hold the pan on .when you remove that pan you will see the filter.It has atleast 2 bolts that hold it on , remove those bolts.MAKE SURE YOU ARE AT THE TRANSMISSION PAN-NOT THE OIL PAN
If all is working fine, and the transmission has never been overheated, an oil change around 50,000 miles ( 80,000 kms ) and the filter will do. Depends on the driving conditions and loads carried. So now please do change it immediately.
That's a load of **** they are feeding you.The timing chain tentioner has a fault and not tentioning the chian.I think you have done a good thing keeping it on synthetic oil.That causes less wear on moving parts than other oils.