I didn't plan on having this many miles on the oil change, but life is what it is. I'm going to probably do two Auto-RX cycles and check again.
Mobil 1, 0w/40 1996 BMW 750iL, 23,012mi
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I didn't plan on having this many miles on the oil change, but life is what it is. I'm going to probably do two Auto-RX cycles and check again.
Well, considering the abuse, not bad. But agree that 23,012 miles is about 10k to long. How many quarts/liters does this car hold?
Looks decent to me. I'd cut back though to more reasonable level. B/S Labs has become really bad at UOA interpretations. The oil has 23,000 miles on it, a TBN of 2.0, viscosity 2.5 cSt where it started (noticed it thicken back up over the long drain). Pb is high. I agree with them on the sodium and some of the wear such as Al maybe elevated slightly but nothing alarming at all. 9qts helps.
9.0 quarts approx with a filter change.
Dude got thick.
But it could be worse. Solids are a bit scary to me. Pb is sorta record breaking. Higher than Fe!
Just clean it out, you'll be good to go.
But it could be worse. Solids are a bit scary to me. Pb is sorta record breaking. Higher than Fe!
Just clean it out, you'll be good to go.
I only make this vis comment because this oil usually goes a bit skinny early...
This engine has an aluminum block, silicon cylinder bore, so all that Fe wear is either coming from the cam chains or the crankshaft journal bearings. I'm not sure how Blackstone could diagnose piston scuffing in an engine that does not have iron sleeves?
The acceleration in the rate of wear is not a good thing at all for Fe, Cu and Pb. Looks to me like the bearings took a huge hit. Fortunately, with a V12, there are a lot of them!
Oh, and the viscosity rise would probably been even worse, if not for the fact that this engine has some fuel dilution going on, too.
M70 engine
The acceleration in the rate of wear is not a good thing at all for Fe, Cu and Pb. Looks to me like the bearings took a huge hit. Fortunately, with a V12, there are a lot of them!
Oh, and the viscosity rise would probably been even worse, if not for the fact that this engine has some fuel dilution going on, too.
M70 engine
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73,145
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Mobil 1 0W-40 ....cleans deposits, sludge and varnish often formed in high temperature operating conditions.
Doubt there are any sludge/deposits.
OAI would have said this report is normal in terms of wear metals.
Amsoil SSO is good for one year/35k miles. Can this car use a 30wt? It would make for a very good comparison.
Mobil 1 0W-40 ....cleans deposits, sludge and varnish often formed in high temperature operating conditions.
Doubt there are any sludge/deposits.
OAI would have said this report is normal in terms of wear metals.
Amsoil SSO is good for one year/35k miles. Can this car use a 30wt? It would make for a very good comparison.
Originally Posted By: buster
OAI would have said this report is normal in terms of wear metals.
I think they would have flagged the Pb. Have you seen the new reports?
OAI would have said this report is normal in terms of wear metals.
I think they would have flagged the Pb. Have you seen the new reports?
Robert1955's report. I think you commented on it.
Originally Posted By: buster
Quote:
Mobil 1 0W-40 ....cleans deposits, sludge and varnish often formed in high temperature operating conditions.
Doubt there are any sludge/deposits.
OAI would have said this report is normal in terms of wear metals.
Amsoil SSO is good for one year/35k miles. Can this car use a 30wt? It would make for a very good comparison.
UP to 35,000 miles . Without looking I don't think the levels are at the condemn limits , could be close . It would be nice to see a comparison. The results are way better than Supertech dino oil
Quote:
Mobil 1 0W-40 ....cleans deposits, sludge and varnish often formed in high temperature operating conditions.
Doubt there are any sludge/deposits.
OAI would have said this report is normal in terms of wear metals.
Amsoil SSO is good for one year/35k miles. Can this car use a 30wt? It would make for a very good comparison.
UP to 35,000 miles . Without looking I don't think the levels are at the condemn limits , could be close . It would be nice to see a comparison. The results are way better than Supertech dino oil
I think I could definately go 15k/1yr on this oil with an extra filter change and a half quart makeup oil.
I think I will stick with Castrol GTX and 7500 mi oil changes after the ARX cycles. I may even just do a single ARX cycle, and then a 7500 mi oil change after and see how things are doing.
Mike
I think I will stick with Castrol GTX and 7500 mi oil changes after the ARX cycles. I may even just do a single ARX cycle, and then a 7500 mi oil change after and see how things are doing.
Mike
Sodium at 39 begs the question of whether it's from road salt, ocean spray, or coolant leak. Potassium is only 4 and if you find out the ratio of potassium to sodium in the coolant you can maybe rule out it being a coolant leak.
I'm not sure exactly what is in the car right now. I know it isn't BMW coolant as that stuff is blue, and what is in the car is green.
I'll be changing it soon with fresh BMW coolant, but for now it stays. I'll double check and see if any oil is in the coolant, but there wasn't any last time I checked.
I'll be changing it soon with fresh BMW coolant, but for now it stays. I'll double check and see if any oil is in the coolant, but there wasn't any last time I checked.
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