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So, what caused the scoring? Piston slap? Leaky injector/preignition-related overheating?
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Originally Posted by Southbranch
(Post 15785303)
So, what caused the scoring? Piston slap? Leaky injector/preignition-related overheating?
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Three primary things (IMO) contribute to bore-scoring:
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One theory - I believe the main cause of bore scoring is due to DFI where the injector could be compromised and be spraying too much fuel...this causes the lubricated cylinder wall to be washed down and metal to metal wear occurs over time.
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Originally Posted by Airbag997
(Post 15785389)
Three primary things (IMO) contribute to bore-scoring:
Originally Posted by Tampa991
(Post 15786258)
One theory - I believe the main cause of bore scoring is due to DFI where the injector could be compromised and be spraying too much fuel...this causes the lubricated cylinder wall to be washed down and metal to metal wear occurs over time.
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Originally Posted by sampelligrino
(Post 15786316)
can you elaborate?
Thinner than other oils of the same grade. Greater burn-off than other oils of the same grade. Piston-slap observed/noted with long-term use. Increased valve noise compared to oils of the same grade. Greater thinning-out/inability to stay-in-grade during use. Poor performance on the Timken test (tri-synth) https://secure25.securewebsession.co...ball_large.gif In my 997.2 with Mobil it use to burn about ~1 quart every 1,000 miles. Then I switched to Motul 8100 5W-40 xcess, didn't burn a drop, ran quieter, and felt smoother. 991 since day 1 Motul 5w-40, doesn't burn a drop, runs like velvet smooth brand new motor. |
Originally Posted by titan7
(Post 15785210)
Wow, it just amazes me, Honda and Toyota can build pretty much bullet proof motors but we have these crazy odd issues with just about every generation of 911. Okay before pounding, yeah I know these are high performance cars, and I am a 911 fanboy, but still, at this point you would figure they could get past these crazy things like PDK bombs, IMS/RMS, bore scoring. Now with that said, my 911 is going nowhere.
cheers! |
Originally Posted by Airbag997
(Post 15786355)
Thinner than other oils of the same grade.
Greater burn-off than other oils of the same grade. Piston-slap observed/noted with long-term use. Increased valve noise compared to oils of the same grade. Greater thinning-out/inability to stay-in-grade during use. Poor performance on the Timken test (tri-synth) https://secure25.securewebsession.co...ball_large.gif In my 997.2 with Mobil it use to burn about ~1 quart every 1,000 miles. Then I switched to Motul 8100 5W-40 xcess, didn't burn a drop, ran quieter, and felt smoother. 991 since day 1 Motul 5w-40, doesn't burn a drop, runs like velvet smooth brand new motor. |
Originally Posted by sampelligrino
(Post 15786401)
hmmm I just had my oil changed with what I believe is mobil 0W-40 last week, but this has me interested to find an independent mechanic to swap in the Motul. Will research more on it, thx
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Originally Posted by Tampa991
(Post 15786873)
Just change it yourself, it takes about 30 minutes.
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There’s a video of a guy in an apartment building garage working on his 991..changes the oil, pulls off the bumper, changes air filters...tools are cheaper than dealer/Indy labor after you use them twice.
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Originally Posted by Tampa991
(Post 15787239)
There’s a video of a guy in an apartment building garage working on his 991..changes the oil, pulls off the bumper, changes air filters...tools are cheaper than dealer/Indy labor after you use them twice.
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Lol you got me with that one lol
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Originally Posted by Tampa991
(Post 15787276)
Lol you got me with that one lol
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Isn’t start up where most wear can happen? Isn’t 0-40 better for that? I am running 0-40 mobile 1. Soooo, Motul is a better option? What weight should I run?
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