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Rotella 15W40 is FINE in the engine and probably will go easily 5000 mile oil changes. I use Rotella and Rimula at times when not using Rotella T Synthetic or Mobil 1.
Thinking about switching to Chevron Delo 15W40 with Isosyn because it will apparently flow OK at low temps (above 0 Fahrenheit ?) despite being a 15W40 weight.
Volvo RECOMMENDS 15W40 weight oils for high oil consumption/high temperature use. My B280F has 267,000 miles, my B230FT has 250,000 miles.
Stay away from 10W40 oils unless they are synthetics and go straight to 15W40. Volvo said the vast vast vast majority of 10W40 oils are a "No, No" for its engines. 10W30 are OK for milder climates.
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