...I've been using Delo 400, but it seems like it gets really thin when the car is warm. Like thin enough that it drips off the dip stick when the car is warmed up. Is this normal for all 15w-40 oils? Does Rotella do this as well?
Will Lyons

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84 300TD 4 speed, green

Any oil will flow more freely when heated, but that doesn't mean they lose their lubricating properties. 15W-40 is the recommended 'weight' for most M-B Diesels, but depending where you live, 20W-50 is OK in hotter weather and 5W-40 can be used in colder climates. Any choice though should be a Diesel Rated oil (minimum CF rated).

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

Mobil 1 0W-40 looks and flows like coffee when cold.

Sixto
87 300SDL

If that coffee is the same as what's sold here at the corner store in the afternoons....you want thinner

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

Stay with 15W-40 for NC. I prefer full synthetic

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Mike

82 240D 97K Original (Sweet)
96 Ford F350 CrewCab Dually,7.3 PowerStroke,144K
(a real workhorse, does anything I need)
04 VW Jetta GLS TDI, 33K (50 mpg & it's quick)
Notice a trend? All diesels

63 Chevy II Nova Convertible (wife's) awaiting restoration - Well everyboby has a little gas every once in awhile

That's normal for any oil when warm, Delo holds up as well as any other non-synthetic.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k