So many helpful and knowledgable people I can't help but ask about a situation mostly specific and unique.

I've got 8k miles on the CRD. I'm due for an oil change now as it's been 6250 miles and 5 months since I switched to the 5W-40 Rotella. I have a 1200 mile trip to make (total mileage) over the next 4 days. Background on the current oil - no less than 20 miles per engine run/start and 50% highway miles, topped off level last week with 3/4 of a quart fresh 5W-40 Rotella.

Would it help the break in to just leave the current oil in for another week and about 30 hours of engine time? Would it hurt anything? Does it even matter?

I'd leave the the existing oil in. I think with the Rotella you'd be good for 10,000 miles (it is in Volkswagen TDI's).

When you get back from your trip, why not perform an oil analysis on the Rotella? That would give you objective information that you could use to base future oil change intervals on.

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2006 Liberty Limited CRD Bright Silver Metallic (NOW SOLD)
All Recalls Performed
100k extended warranty
Fumoto Oil Drain Valves (Oil Pan & Transfer Case)
V6 Airbox Mod
New Driveshaft, New EGR
2003 Wrangler Sport 4.0L, Bright Blue
2007 Wrangler Sahara Unlimited 4 Door, Red Rock Crystal Pearl WOW!!!

I agree, the oil should be in real good shape and with that top off you did the additive package should also be in good shape. You need not worry as I have driven many miles in diesels using 10,000 mile oil changes without ever hurting an engine whether it be a cheap VW diesel or a rather expensive MB diesel.

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91 MB 300D 2.5L Turbo. Her's

05 MB E320 CDI. Mine

FWIW from a non-CRD owner, I Agree with the above.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

Cool. I'll just wait until next weekend so I can have a fresh batch of oil for all my in town driving.