0W40 or 5W50??
04-24-2015, 09:12 AM
#16
04-24-2015, 09:42 AM
#17
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04-24-2015, 09:44 AM
#18
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04-24-2015, 09:51 AM
#19
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IMHO...the greatest wear moment for an engine is at cold startup....therefore it follows to have an oil viscosity as thin as possible to quickly lubricate the moving parts. 0 weight is thinner than 5 weight therefore it will lubricate the parts quicker and induce less wear and tear on the motor at start up in theory. I'm sticking with 0-40 weight oil.
And I'd want a better oil; one with better high shear high temp stability, to protect a GT3 motor at 9,000 rpms than 1,200 rpms at startup.
04-24-2015, 10:01 AM
#20
Nordschleife Master
There's W A Y more to oil chemistry than a 0 weight vs a 5 weight, with regards to cold start-ups. Not all 0 weights are the same. Not all 5 weights are the same.
And I'd want a better oil; one with better high shear high temp stability, to protect a GT3 motor at 9,000 rpms than 1,200 rpms at startup.
And I'd want a better oil; one with better high shear high temp stability, to protect a GT3 motor at 9,000 rpms than 1,200 rpms at startup.
04-24-2015, 10:18 AM
#21
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****I think the 997 GT2RS was factory filled with Mobil 5W50. Someone check this.
04-24-2015, 10:24 AM
#22
Nordschleife Master
No. Not at all. Please re-read some/most/all of my comments. I say Mobil 0W40 is a good/fine Oil. Mobil 5W50 is slightly better. I'm shooting for slightly better. I don't know what the best oil is. Not yet.
****I think the 997 GT2RS was factory filled with Mobil 5W50. Someone check this.
****I think the 997 GT2RS was factory filled with Mobil 5W50. Someone check this.
04-24-2015, 10:29 AM
#23
Nordschleife Master
I use 5w-50 because of my track usage and I live in a warm climate, so freezing startup temps aren't an issue.
Anyone have a good source for 5w-50? I haven't found a place that consistent place with a good price and in stock. Nobody carries the stuff locally
Anyone have a good source for 5w-50? I haven't found a place that consistent place with a good price and in stock. Nobody carries the stuff locally
04-24-2015, 10:34 AM
#24
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04-24-2015, 10:36 AM
#25
Rennlist Member
Oil wars!!
Was bugging engine builder at shop other day and he was assembling head on a mezger and replacing the cam rollers or tappets whatever they are called. He said engines that he sees that run m1 040 see pretty high wear there compared to thicker or better quality oils.
Keep in mind most of the engines he sees are tracked heavily, are cup engines, or high power turbo builds.
Was bugging engine builder at shop other day and he was assembling head on a mezger and replacing the cam rollers or tappets whatever they are called. He said engines that he sees that run m1 040 see pretty high wear there compared to thicker or better quality oils.
Keep in mind most of the engines he sees are tracked heavily, are cup engines, or high power turbo builds.
04-24-2015, 10:40 AM
#26
Nordschleife Master
https://www.motul.com/system/product...pdf?1323963250
04-24-2015, 10:47 AM
#27
Nordschleife Master
There is a Mobil 1 5w-50 available in the US...
04-24-2015, 11:08 AM
#28
Race Director
Actually, if you look at the Mobil data sheets, they both have the same zinc and phosphorus levels. Where the Mobil 5W50 really shines is the more robust overall additive package, and much better high temp, high shear stability. When you read a bunch of UOA's on both these 2 specific oils, the 5W50 usually has more zinc and phosphorus at the end of the drain interval as compared to the 0W40.
Again, the 5W50 is slightly better than the 0W40. All I'm shooting for is something that is "slightly better". I don't know what the "best oil is".
If you consistently run UOA's on your old oil, what you want to see is the eventual leveling off of your wear metal values (sometimes referred to as 'freezing'). They are not going up, they are not going down. And they are low/below universal averages. This pretty much tells you that you have a good oil selection, and a good oil drain interval for your motor and driving style/conditions.
Again, the 5W50 is slightly better than the 0W40. All I'm shooting for is something that is "slightly better". I don't know what the "best oil is".
If you consistently run UOA's on your old oil, what you want to see is the eventual leveling off of your wear metal values (sometimes referred to as 'freezing'). They are not going up, they are not going down. And they are low/below universal averages. This pretty much tells you that you have a good oil selection, and a good oil drain interval for your motor and driving style/conditions.
04-24-2015, 11:10 AM
#29
Race Director
IMHO...the greatest wear moment for an engine is at cold startup....therefore it follows to have an oil viscosity as thin as possible to quickly lubricate the moving parts. 0 weight is thinner than 5 weight therefore it will lubricate the parts quicker and induce less wear and tear on the motor at start up in theory. I'm sticking with 0-40 weight oil.
) the bank
04-24-2015, 11:12 AM
#30
Race Director
