My mechanic is rebuilding the transmission on my '88 300E. He said if I want synthetic ATF this is the time to switch. What is the consensus? If I use synthetic, is Mobil 1 the one?

Thanks,
Ray

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2001 Golf GLS TDI 5-Speed Reflex Silver 244K 46 MPG hwy Mobil 1 ESP 5w30 (VW 507.00 MB 229.51), Michelin Pilot Exalto A/S (mine)

2010 TDI Jetta Sportwagen DSG White Gold Metallic/Corn Silk 7K miles | Panoramic Roof | iPod kit | Mats+Splash Guards kit | built 11/09 | acquired 12/20/09 (hers)

'88 300E Sold