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Blackstone says they aren't ready to call this a problem, but some of the readings are of concern to me. Truck is a 2009 Duramax with 27K miles. Under 5K on the oil, and the truck has been running hot (250*+ towing). I'm concerned there may be long term damage to the engine from operating in...

I got the VOA from Blacksotone. Thoughts? The trace wear metals we found in this virgin sample are becoming increasingly common finds in virgin oils. They aren't much of a problem. No moisture was found and the trace of insolubles is acceptable. Calcium and magnesium are your detergent/...

Okay, I have heard a number of different explanations of oil vis - eg. 15W 40. Can someone please confirm? I have always thought that with a multi grade oil, the lower grade number indicated the cold flow rate, meaning the oil flows like a straight 15 viscosity at 40*C, and when it warms it...