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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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Did they change Mobil 1 15w-50 or just the bottle?
I posted this to Renn / 964 but since this concerns all air cooled I'm gonna ask the crew here -
Last time I bought 15w50 M1 - not that long ago - it had red text on the container. Now its grey. Mobil's tech specs state "Updated October 2019" and show nice high zinc/zddp and specifically call out flat tappet applications. I like all of that. But what I don't know is if the "redesign" changed the formula or is just a graphic design exercise? https://www.mobil.com/lubricants/-/m...ide-rev-31.pdf OLD  NEW 
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process |
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11-28-2020, 09:53 AM
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Because NASCAR.....
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 |
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11-28-2020, 11:00 AM
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Racer
Join Date: Oct 2010
Location: Franklin, TN
Posts: 5,887
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Notice it is now also "race proven"!
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Scott Winders PCA GT3 #3 2021 & 2022 PCA GT3 National Champion 2021 & 2022 PCA West Coast Series GT3 Champion Last edited by winders; 11-28-2020 at 02:49 PM.. |
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11-28-2020, 11:20 AM
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Quote:
The specs for 15w-50 have been the same for the last 15 yrs
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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11-28-2020, 12:49 PM
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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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I called and verified this is correct. Same juice new package.
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process |
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11-30-2020, 06:08 AM
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This is surely a silly question but there's something confusing me: what's the benefit of Mobil 1 15W50 with respect to Mobil 1 5W50?
Based only on the numbers, it would look like they have the same viscosity at high temperature but at low temps, the 5W50 has a lower viscosity (i.e. it has less change of viscosity with temperature). Is 15W50 maybe better to avoid oil leaks when the engine is cold?
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📸 https://www.instagram.com/porsche.tech 📸 |
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11-30-2020, 06:42 AM
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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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Good question. Its got nearly as much Zinc/ZDDP as 15w50. It is one of the viscoscities Porsche offers. I don't know how to evaluate if 15w or 5w is a better side to err on from their own recommend 10w60 (to 3 liters)
from https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/producthighlights/motoroil/ Developed as a 20W-50 oil for 356, 914 and early air-cooled 911 models with a displacement of up to 2.7 liters Developed as a 10W-60 oil for air-cooled 911 models with a displacement of up to 3.0 liters
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process |
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11-30-2020, 06:55 AM
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Hmm perhaps the Valvoline 20w50 i have been using on my 3.2 should be reconsidered to a 10w60 synthetic?
I was told years ago the 20w/ cold # kept more oil on the parts than a lower # at cold start. |
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11-30-2020, 08:30 AM
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Just looked, not sold in US.
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11-30-2020, 09:04 AM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
