Overall, the report looks ok. What is your driving style? I expected the TBN to be higher.
Mobil 1 SS 10W-30, 4,993mi, 2003 CTS
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The report is a little puzzling to me. Blackstone thought the Fe could be break in. GM engines have a reputation for taking almost forever to break in.
I recently posted another UOA on a Mazda with Redline which had high Si. I live in the Chicago area and it is not especially dusty, but something must be going on with both cars.
My driving style is moderate. I can't afford to hot rod it with gas at $2.50/gal.
I recently posted another UOA on a Mazda with Redline which had high Si. I live in the Chicago area and it is not especially dusty, but something must be going on with both cars.
My driving style is moderate. I can't afford to hot rod it with gas at $2.50/gal.
Sometime you just can't help it.quote:
Originally posted by White Fang:
My driving style is moderate. I can't afford to hot rod it with gas at $2.50/gal.
Here is a Blackstone Labs analysis on my Caddy. The car has 14,198 miles on it. It is a 2nd car and does not get a lot of use so I changed the oil at 11 1/2 months. Plus I wanted to switch to Redline.
Any metals not listed are zero.
Al, 1
Cr, 2
Fe, 32 (engine still breaking in?)
Cu, 4
Pb, 2
Mo, 70
K, 1
B, 136
Si, 12
Na, 6
Ca, 2,564
Mg, 20
P, 740
Zn, 863
TBN 3.3
SUS @ 210o 58.7
Flash 395
Insolubles .4
My oil life indicator showed that I still had 27% oil life left when I changed it. Extrapolating that would mean I could have gotten 6,840 miles total out of the oil.
Any metals not listed are zero.
Al, 1
Cr, 2
Fe, 32 (engine still breaking in?)
Cu, 4
Pb, 2
Mo, 70
K, 1
B, 136
Si, 12
Na, 6
Ca, 2,564
Mg, 20
P, 740
Zn, 863
TBN 3.3
SUS @ 210o 58.7
Flash 395
Insolubles .4
My oil life indicator showed that I still had 27% oil life left when I changed it. Extrapolating that would mean I could have gotten 6,840 miles total out of the oil.
Take away the Fe, which could be from break-in, it's a great report. Take away the high Fe in most M1 reports, and it's the best synthetic IMO....for the $$.
I don't think the Fe has anything to do with ZDP or viscosity either. Many other oils have the same levels and show low Fe. And if viscosity was the issue, Pb would be higher right?
I don't think the Fe has anything to do with ZDP or viscosity either. Many other oils have the same levels and show low Fe. And if viscosity was the issue, Pb would be higher right?
I do not think it is break in wear at all! The silicone looked high for the milage check your air filter and duct work! I think the iron and cromium are from silicone primarily. THe alternative answere would be just from the length of the OCI in terms of total month ie corrosive iron wear. I would prefer to see cromium at 0 ppm. The rest of it looked fine. Insolubles look good for an oil that has been in service for almost a year!
Yes Ted it does. I had to check the service manual to find out. The engine is an Opel engine, designed, I believe in Germany.
Why would DOHC contribute more iron?
Why would DOHC contribute more iron?
I am not familiar specifically with your V-6 (you have the 3.6?) but...DOHC, 4 camshafts, 24 valves, that's a lot of parts rubbing together. Not sure if the valves have roller followers (usually not).
Also, one camshaft per bank is often driven by a chain, the other it geared to the driven one. The scissor pattern used on these gears may need some wearing in. Sometimes the chain wraps around both.
The chains probably have some tensioners that might throw some metal off.
There should be some pics in the workshop manual.
Also, one camshaft per bank is often driven by a chain, the other it geared to the driven one. The scissor pattern used on these gears may need some wearing in. Sometimes the chain wraps around both.
The chains probably have some tensioners that might throw some metal off.
There should be some pics in the workshop manual.
Geoff is on the right track with his comments about ferrous materials coming from the timing chain and/or gears - that's why I asked about the valve train design....
Based on the EOT (End Of Test) total base #, the viscosity and the solids level, I'd say you could go to a 6000-7000 mile oil change interval. The piston ring seal should show further improvement w/ more miles on the engine. This will result in a slower generation of organic insoluble particles in the oil after the same # of miles.
Tooslick
Based on the EOT (End Of Test) total base #, the viscosity and the solids level, I'd say you could go to a 6000-7000 mile oil change interval. The piston ring seal should show further improvement w/ more miles on the engine. This will result in a slower generation of organic insoluble particles in the oil after the same # of miles.
Tooslick
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