I've been using synthetics for years in the driveline and used to always do these changes myself until I had a major spillage and these activities have become forbidden at home now. Find a garage or lube place that has a window or someplace to watch thing and take them your own oil and filter and pay for labor. Otherwise, take them the oil and filter and just trust them.

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PagodaLOVER
1967 230SL, manual
1959 180D, manual