Sl 320 I just wanted to know what kind of oil (type/brand) to use and what kind of transmission fluid (type/brand) I should use.

Cvt auto fluid

Since you say gear oil I assume that it is a manual transmission. Here are codes and fluid type/capacity
Transmission fluid Capacity 2.0 liters
Transmission code: DYP, ECW, EFG, ERS, FBV, FBX, FBY, EGY, EVR, EZK, FCF Type G51 SAE 75w-90 (synthetic oil)
Transmission codes: DQY, DBZ, DZQ, DZC, EGC, EGF, EKG, EMR, EMS, ENH, ENJ, EBJ, EBP, EBQ, EZH, EWW, FBW, EGR, EBN, EGT, EGX, EGU, EHC, FDS, EHA Type G50 SAE 75w-90 (synthetic oil)

In the back of your owners manual they list approved fluids or approved fluid types. Mercedes has more up to date lists on the websites. Yours should be a Dexron II type but verify with your manual or dealer (call parts department and ask, they will tell you but service manager won't have a clue). You have to double check as the 90's were transitional where they went from the older style fluids to full synthetics in everything.

gear oil, weight and capacity is in the owners manual. the guy behind the counter at the parts store can sell you some.

You put gear oil in a manual transmission, not automatic transmission fluid. Look in your owners manual for the proper weight, or ask the guys behind the counter at a parts store.

Engine Oil
Grade 1......API*Maximum Performance Signature Series 0W-30 100% Synthetic Motor Oil (SSOQT) Signature Series 0W-30 100% Synthetic Motor Oil (SSOQT)
Drain Interval Information
Maximum Performance SAE 5W-30 Synthetic Motor Oil (ASLQT) SAE 5W-30 Synthetic Motor Oil (ASLQT)
Drain Interval Information
Performance Plus XL 5W-30 Synthetic Motor Oil (XLFQT) XL 5W-30 Synthetic Motor Oil (XLFQT)
Drain Interval Information
Performance Synthetic 5W30 OE Motor Oil (OEFQT) Synthetic 5W30 OE Motor Oil (OEFQT)
Drain Interval Information
Above 19 F......10W-30
All TEMPS......5W-30 [1]
Manual Transmission,......SLF [2]
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,MP6......AF3
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,MP7......AF3
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)

YOU MUST PULL THE BOTTOM PAN OF THE TRANSMISSION TO CHANGE THE FLUID, THERE IS NO DRAIN, THE FLUID U USE IS CALLED "DEXRON VI" THIS JOB IS VERY MESSY

Hi there,

Mercedes have purposely not put a transmission dipstick in their cars...to STOP any unauthorised persons from tampering with transmission fluid levels.

Electronic transmissions are extremely temperamental - if incorrect type, level is too low (or too high), this will accelerate premature wear and tear, not to mention erratic shifting behaviour.

For this reason, only Mercedes service agents have the required workshop tool (ie dipstick) which they insert into a tube in the transmission, to check levels.

If you happen to obtain the correct tool for your own use....please ensure you use only Mercedes specified fluids....and NEVER overfill the transmission case.

Cheers,

car condition good just go for 10w 30 for good density oil