Fluid level check out okay. Right in between the low and high marks... Yes this is the 81, I do not know if it has the external or internal adjustment... Any ideas?

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Regards,
Ian White

1995 E300 Diesel w124 OM606
2014 E550 w212 M278 biturbo

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)