Recent content by robertjhoag

Interesting reading: http://www.spiegel.de/international/spie...s-a-448747.html

When Montana instituted speed limits, the fatality rate doubled. The 85th percentile has long been established by the NHTSA as the absolute safest way to set speed limits resulting in the lowest rate of accidents and fatalities. I'd venture a guess that the NHTSA knows more about speed limits...

Originally Posted By: bullwinkle Originally Posted By: robertjhoag Sorry, I'm a bit of a rookie here - I should have called out the fact that the oil used is Rotella T Dino 15-W40. 250* is from the dash gauge, verified by an edge insight, which sees between 250 - 255* in the hot weather towing a...

Sorry, I'm a bit of a rookie here - I should have called out the fact that the oil used is Rotella T Dino 15-W40. 250* is from the dash gauge, verified by an edge insight, which sees between 250 - 255* in the hot weather towing a 5er on the freeway. I'm glad to hear that the copper could be...

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...

Is there a possibility that Blackstone mixed up my VOA sample with someone elses 10w-40 PCMO? The more side by side comparison I do, the more it looks like cheap 10w-40 someone had sampled - maybe even a short term UOA with the traces of wear metals. This doesn't inspire a ton of confidence in...

Originally Posted By: jmac Compare above to this UOA of V PB CJ, and it looks like [censored] sent out the wrong sample results. How do I post the full sheet as above? Would save time from trying to type it all out.

A good comparison of all the HDEOs, non synthetic for my purposes. I would include at least Shell Rotella 15w-40 Chevron Delo 15w-40 Mobil Delvac 15w-40 Valvoline Premium Blue 15w40 All the HDEO VOA's stickied in this section are way out of date. Bonus points for synthetic versions of the...

After doing some more reading, is it possible that this sample got "Blackstoned?" Seems like their OAs are not known for being very accurate. Although I didn't shake the bottle myself immediately prior to pouring, it was bouncing around all day in the toolbox of my 1 ton dually truck. Believe...

Wow - didn't realize that the oil was so deficient, or how important the zinc and phosphorous were. Is there any way I could have screwed up the sample? Eg, not shaking the bottle before pouring? I'm not sure if these additives settle out over time, but that's a scary thought if I'm only...

I'm kind of new to the oil thing, so might need further explanation. I didn't have TBN run, as I thought that was to determine if a used oil still had life left. What would be "good" for zinc and phos? I know this is a CJ4 oil and will be down on some of those additives compared to an older CI...

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...

Can someone with a little more insight and experience and I with UOA review the numbers above? I am extremely interested in the VPB for my new Duramax, and numbers with the moly, zinc and phosphorous have caught my attention. Are these as good indicators of wear protection and friction...

I've run the search functions and the UOA's for valvoline are not for the premium blue. No shortage of the PCMO 10-30, but the HDEO seems to be scarce. Once I get my truck broken in and switched to VPB, I'll post some of my results. I think I'll do a VOA just for peace of mind - if the moly...