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