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JoeFromPA · 01-16-2011, 07:08 AM

JFP - I hadn't logged in in 4 days after checking later in the day for your response. My apologies that I apparently seem "suspicious" in my lack of immediate response.

Your data looks solid and shows a fairly ridiculous level of shearing in the period of time shown. The TBN retention is misleading - TBN tends to decrease drastically immediately, and then settle in.

Nonetheless, it's troubling. I've seen M1 0w40 shear down to a 20 grade plenty of times, and not affect notable engine life, but that was after an extended run. I think its known to shear down to a 20 grade in the DI Audi/VW 2.0t engine, but that engine even eats up redline 5w40 in 5k miles.

I'm sorry to say that after 20 minutes of googling, I can't find a single boxster 2.5 liter UOA to gain any personal insight on beyond what you've shared. So I'll take your words as wisdom until I find either further reinforcing evidence or something to dispute it.

Don't know if you care, but here's my own relevant history of UOAs:

Mobil One 15w50 in my 2008 Subaru Legacy GT (known for eating up oils) - Link to 15w50 UOA

60k miles of extended duration UOAs on my '06 Civic SI, up to its current usage of M1 0w40 for 13k: 06 Civic SI UOA series

I'm going to step out in a few minutes and, as a result of your UOAs, will buy either redline 5w40 (if I can find it) or M1 5w40 TDT instead of using my stock of 0w40.

I appreciate the time you've put into sharing this - I am not a blind shill to either side and though I'd prefer to see your data set, I also know you have a solid reputation here.

Thanks for taking the time to respond to me in depth.

01-16-2011, 07:08 AM	#34
JoeFromPA Registered User Join Date: Jul 2010 Location: West Chester, PA Posts: 211	JFP - I hadn't logged in in 4 days after checking later in the day for your response. My apologies that I apparently seem "suspicious" in my lack of immediate response. Your data looks solid and shows a fairly ridiculous level of shearing in the period of time shown. The TBN retention is misleading - TBN tends to decrease drastically immediately, and then settle in. Nonetheless, it's troubling. I've seen M1 0w40 shear down to a 20 grade plenty of times, and not affect notable engine life, but that was after an extended run. I think its known to shear down to a 20 grade in the DI Audi/VW 2.0t engine, but that engine even eats up redline 5w40 in 5k miles. I'm sorry to say that after 20 minutes of googling, I can't find a single boxster 2.5 liter UOA to gain any personal insight on beyond what you've shared. So I'll take your words as wisdom until I find either further reinforcing evidence or something to dispute it. Don't know if you care, but here's my own relevant history of UOAs: Mobil One 15w50 in my 2008 Subaru Legacy GT (known for eating up oils) - Link to 15w50 UOA 60k miles of extended duration UOAs on my '06 Civic SI, up to its current usage of M1 0w40 for 13k: 06 Civic SI UOA series I'm going to step out in a few minutes and, as a result of your UOAs, will buy either redline 5w40 (if I can find it) or M1 5w40 TDT instead of using my stock of 0w40. I appreciate the time you've put into sharing this - I am not a blind shill to either side and though I'd prefer to see your data set, I also know you have a solid reputation here. Thanks for taking the time to respond to me in depth. __________________ 99 Boxster 5spd - 64k miles 06 Civic SI - 114k miles, D.D., unbelievably reliable and fun to beat on everyday. 08 Legacy GT 5spd - 74k miles.