Keep an eye on the coolant. Don't be too alarmed. I would have to remind myself that this is a 25 year old diesel engine. Probably just nature of the beast.

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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)