I am the lucky owner of a bore scored engine
05-02-2016, 12:17 PM
#107
Former Vendor
Bank 2 has another detriment in the wrist pin offset of the piston.. It's backward. The engine should use two different pin offsets, and two different piston part numbers. It does not.
05-02-2016, 12:18 PM
#108
I tend to believe the bore scoring issue relates to owners and dealers using 0w-40 weight oil year round. Porsche Owners go long time periods, not mileage intervals, between changes. Much more importantly, owners don't think to change oil weight in relation to outside temps. The 'dealer maintained' car might have had religious oil change intervals, but I bet owners go from summer temps to winter temps with thin oil and don't change weight.
I don't think Porsche engineered cars that will have problems running in cold temps. It's the weight of oil being used in low temps. Or, the fact that the same oil weight is being used in locations that experience massive 100 degree temp variance. The weight of the oil, let alone low zinc oil, in very cold temps vs very hot extremes, would exacerbate any cylinder scoring, I assume. I'm no expert. Any thought from any engine guys?
Would love to know as I always struggle with the ideal oil.
I don't think Porsche engineered cars that will have problems running in cold temps. It's the weight of oil being used in low temps. Or, the fact that the same oil weight is being used in locations that experience massive 100 degree temp variance. The weight of the oil, let alone low zinc oil, in very cold temps vs very hot extremes, would exacerbate any cylinder scoring, I assume. I'm no expert. Any thought from any engine guys?
Would love to know as I always struggle with the ideal oil.
05-02-2016, 02:54 PM
#109
Rennlist Member
His comments omit oil shearing and this is probably part of his thinking. At least how I read it. Maybe he can clarify.
I reckon there are more than a few thinking good quality 5W-40 or 5W-50 oils are better options for the summer and/or extreme operation for the M97 engine.
05-02-2016, 04:02 PM
#110
Three Wheelin'
Generally, the farther the viscosity spread between cold and hot (0 up to 40) the sooner you can expect the oil to break down into something less than it was.
0W-40 is best for the very cold climate, but most would say to move to more frequent changes in very cold weather, and then switch to 5W-40 when seasons change to warmer weather.
In the cold regions, it's very likely the oil is just loaded up with water anyway, regardless of viscosity, considering the extended time spent in a sloppy combustion state and how hard it is to get the oil to over 212f (100C).
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0W-40 is best for the very cold climate, but most would say to move to more frequent changes in very cold weather, and then switch to 5W-40 when seasons change to warmer weather.
In the cold regions, it's very likely the oil is just loaded up with water anyway, regardless of viscosity, considering the extended time spent in a sloppy combustion state and how hard it is to get the oil to over 212f (100C).
.
05-02-2016, 04:52 PM
#111
Track Day
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05-02-2016, 05:00 PM
#112
05-02-2016, 05:27 PM
#115
Former Vendor
05-03-2016, 12:27 AM
#117
Rennlist Member
Originally Posted by Fahrer
I am not sure I follow you on this. The 0W-40 lube provides very good lubrication at start up and is a 40 weight at operating temperature. There is no need to go higher than 40 weight for a daily driver. Therefore, no need to use a different lube for summer or winter.
Really, I'm trying to get my knowledge up on this issue as I have a 2006 997.1 C2S incoming this month. I went 997.1 for a few reasons. I actually spoke with Flat6innovations a few times in the past year, since I was thinking of buying a 997.1 with a failed motor and sending in straight to them. I had a car lined up and the deal fell through at the last minute. I didn't want to wait longer, so I went ahead with a solid, lower mile, warm weather car in the right color.
I hope to enjoy if for a few years, then send it to flat6 for the street/ track 4.0 upgrade. If i need to sooner, I'm good with that.
Sorry for the confusion on oil.
05-03-2016, 12:55 AM
#118
Ah, got it now. So it's purely a piston design issue similar to these threads.
http://forums.pelicanparts.com/911-e...in-offset.html
http://www.thesamba.com/vw/forum/viewtopic.php?t=346211
http://forums.pelicanparts.com/911-e...in-offset.html
http://www.thesamba.com/vw/forum/viewtopic.php?t=346211
05-03-2016, 07:33 AM
#119
Generally, the farther the viscosity spread between cold and hot (0 up to 40) the sooner you can expect the oil to break down into something less than it was.
0W-40 is best for the very cold climate, but most would say to move to more frequent changes in very cold weather, and then switch to 5W-40 when seasons change to warmer weather.
In the cold regions, it's very likely the oil is just loaded up with water anyway, regardless of viscosity, considering the extended time spent in a sloppy combustion state and how hard it is to get the oil to over 212f (100C).
.
0W-40 is best for the very cold climate, but most would say to move to more frequent changes in very cold weather, and then switch to 5W-40 when seasons change to warmer weather.
In the cold regions, it's very likely the oil is just loaded up with water anyway, regardless of viscosity, considering the extended time spent in a sloppy combustion state and how hard it is to get the oil to over 212f (100C).
.
05-03-2016, 08:59 AM
#120
Three Wheelin'
I'd not disagree with that, but there's a couple of intense discussions in the archives from some people who know far too much about oil and the analysis. All I could do was make mental notes about sheer characteristics.
There seemed to be enough of a difference between Mobile 0W-40 vs 5W-40 to convince many to lean towards 5W-40, and then jumping to another brand (e.g. Motul) in 5W-40 made an even greater improvement.
Were I starting my car frequently in the polar vortex, I'd be running 0W-40, I'd be on about 3000 mil (5000 KM) oil change intervals, and I'd be going out of my way to get the oil very hot now and then. I would cringe if I had 5W-40 and it was like -10F (-24C). 0W-40 would be better for sure.
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There seemed to be enough of a difference between Mobile 0W-40 vs 5W-40 to convince many to lean towards 5W-40, and then jumping to another brand (e.g. Motul) in 5W-40 made an even greater improvement.
Were I starting my car frequently in the polar vortex, I'd be running 0W-40, I'd be on about 3000 mil (5000 KM) oil change intervals, and I'd be going out of my way to get the oil very hot now and then. I would cringe if I had 5W-40 and it was like -10F (-24C). 0W-40 would be better for sure.
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