Update:
From Penzoil
Dear Consumer,
Your manual states:
Manual Transmission Fluid Type

No fluid service required. Only use fluid approved to MB 236.2. SAE 5W-20 engine oil, meeting API SL or GF-3, may be substituted.
Our Pennzoil Synchromesh does not meet the MB 236.2 specs. Thus, we cannot recommend using our product for your manual transmission. You will need to purchase it from your dealership.
Regards,