2000 detroit series 60 12.7
1,492,000 odometer
~750,000 on inframe
~600,000 on 6-pack
15,000 on oil
OPS eco-pur
Mobil delvac conventional
Dipstick drops from full to 9/10 in 15,000 miles
No coolant loss
Hot oil pressure drops from 48psi @ 1250 rpm to 45psi in 15,000 miles
8mpg over last 25,000 miles (actual -- not ecm)
I changed the oil after purchasing this truck & sent a sample of the reportedly 20,000-mile old oil to blackstone. Over a month later (apparently, USPS does not like it when you send it in the plastic shipping jar -- box it instead), the results came back with alarmingly high lead.
So at the next oil change, I took 2 samples back-to-back and sent one to Blackstone & one to Polaris (this time boxing the jars). The samples were taken from the OPS's sample port as the engine was idling down after 8 hours on the highway. The original sample was taken mid stream during a cold oil change.
Blackstone (sample analyzed in 4 days) said this sample was good and suggested increasing the change interval to 18,000. Polaris (sample anaylzed in 5 days) flagged fuel dilution & showed a little more lead than the same oil at blackstone.
Given the unreasonable lack of oil consumption and the high lead on the first sample, I'm inclined to trust Polaris a bit more (incidentally, Polaris's tests cost a bit less).
Thoughts? I don't idle, which Polaris said could cause fuel dilution, but I do cruise at 1250 rpm which is kinda low for a 12.7... Should I do any additional diagnosis or just throw in a new 6 pack? I've been wanting to retrofit an engine brake anyway (delayed my plans after getting 1st oil report back)
Oil sample reports, Blackstone vs Polaris side-by-side...
Discussion in 'Ask An Owner Operator' started by double yellow, Oct 22, 2014.
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I'm just curious how you got that high of MPG? What do you pull and at what speeds in what terrain?
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I would check with Kevin Rutherford from xm trucker's radio channel on this. Check his web sight for call in info.
I think his normal recommendation for Detroits is injectors followed by injector cups. -
Up to 2 percent fuel dilution is treated as zero as the fuel is very difficult to separate from oil, both being from petroleum crude oil. Sample again in 15000 miles and see if a trend develops
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milskired Thanks this. -
Always take your oil sample with the oil hot - up at operating temp. Don't these labs give you recommendations on what you should do or flag it as critical, or to just run it sample as normal, and see what it looks like next time? That's what any sample report should do not everyone is a metallurgical expert that's why I pay them to do it. I send my samples to the local CAT franchise it costs about $12 and USPS does not mind the sample bottle in the postage paid bubble wrap envelope. In your shoes I would be looking for the nearest Detroit diesel shop (not a freightliner or other dealer) and see what sort of sample program they have. It's probably competitive or even cheaper than Blackstone or these other aftermarket labs.
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That's who I do mine through, Detroit Diesel. Shop by me uses them for all samplings.
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Unfortunately, I haven't had ANY luck with local shops -- including the 2 detroit-authorized service centers. Besides, I'm OTR 330 days/year -- its easier to mail it & deal with the same person all the time.
Speaking of that, I emailed both Blackstone & Polaris their competitor's reports. Blackstone responded almost right away:
Opendeckin Thanks this. -
KR said not to worry, Polaris' 3.6% fuel dilution is really more like 1.6%
Blu_Ogre Thanks this.
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