OIL--why 0-40wt? Study w/great facts...
#1
Three Wheelin'
Thread Starter
OIL--why 0-40wt? Study w/great facts...
In changing my oil, I've found it to be quite the challenge to find 0-40wt Mobil 1. Which I finally did at Walmart for $5.68 a qt. I wanted to buy the Gallon jug but couldn't find anyone who even carried the stuff. That said, I began to wonder, why 0-40wt? Well, I found this article that I believe will be interesting to Porsche owners. Have a read...
http://www.performanceoilnews.com/oi...nst_oils.shtml
http://www.performanceoilnews.com/oi...nst_oils.shtml
#2
Chandler!
Rennlist Member
Rennlist Member
Here's fantastic thread on the CGT forum, Doug Hillary does an amazing job explaining oil.
https://rennlist.com/forums/porsche-supercars-carrera-gt-918-960/249494-c-gt-oil-change.html
https://rennlist.com/forums/porsche-supercars-carrera-gt-918-960/249494-c-gt-oil-change.html
#3
The performance oil article suggests that Mobile 1 0-40 requires frequent oil changes but yields most HP. When I changed my oil at 10K mi, it still has another 5K mi to go based on the color of it (light brown only). This tells me that our engine and oil cooling is doing a great job in keeping the oil cool.
#4
Originally Posted by riad
Here's fantastic thread on the CGT forum, Doug Hillary does an amazing job explaining oil.
https://rennlist.com/forums/showthread.php?t=249494
https://rennlist.com/forums/showthread.php?t=249494
#5
Three Wheelin'
Thread Starter
I'd like to point out that I was unable to find metal chips, which are considered normal if they're small and few, as OCBen had in his oil. My 997 has 13k on it. I even ran a magnet through the oil with little results, most parts made from various hardened aluminums these days, no surprise. I removed 8.5 qts and replaced it with 9. Sure I could have had the dealer do it, but I wanted to see, smell and feel the oil.
#7
Instructor
Join Date: Sep 2005
Location: Midlands, UK
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
It's not too surprising that particles are invisible to the naked eye a micron is a milionth of a metre - approximately 4 X 10^(-5) inch, so 20 micron is only 0.0008 inch (imagine a particle with a diameter of about a quarter of the thickness of a human hair). Sampling oil requires cycling the oil through a series of graduated filters for a period of time and then examinig these under a microscope.
Trending Topics
#8
Originally Posted by MMD
Would it be a good idea to switch from a 0-40 viscosity oil to a 10-40 (if available) to reduce oil consumption?
CAN you fiddle with the lower viscosity number to improve oil consumption and not harm engine?
CAN you fiddle with the lower viscosity number to improve oil consumption and not harm engine?
#9
Race Car
If your engine is prone to burning oil or leaking oil, it will be at it's worse with a 0W40 oil. These engines should not be running this low of a viscosity in moderate to high temperature regions. However, if you continue to prefer to follow Porsche's sugestion to use 0W40, then you can always fall back on the false beleif that "all flat sixes use oil", and live with the decreased performance of your engine due to blowby along with increased likelyhood of seal leakage. You may also experience additional valve noise in hot weather due to premature leakdown of oil using a 0W oil.
Absolute minimum oil viscosity in an engine that runs 210F+ is 5W50 if you truely care about performance and protection of the engine.
Absolute minimum oil viscosity in an engine that runs 210F+ is 5W50 if you truely care about performance and protection of the engine.
#10
Originally Posted by MMD
Would it be a good idea to switch from a 0-40 viscosity oil to a 10-40 (if available) to reduce oil consumption?
Originally Posted by MMD
CAN you fiddle with the lower viscosity number to improve oil consumption and not harm engine?
Originally Posted by MMD
IOW, would a 5-40 be burned less than a 0-40?
#11
Race Car
Originally Posted by wross996tt
First off, the link suggests multiple times that you should use what is on Porsche's recommended list (0W40 or 5W40!)..so just say no to 10W40.
IBID
This is a good question...but I think oil consumption is more than just realted to oil viscocity. Probably a result of an interaction of factors including break-in, seals, environmental, driving habits, start-up and cool down process, etc. Are you talking about the oil "consumed" at start-up or during normal operation or at the track? Seems to me the oil is there to lubricate and cool. If it is being consumed there are other reasons IMHO.
IBID
This is a good question...but I think oil consumption is more than just realted to oil viscocity. Probably a result of an interaction of factors including break-in, seals, environmental, driving habits, start-up and cool down process, etc. Are you talking about the oil "consumed" at start-up or during normal operation or at the track? Seems to me the oil is there to lubricate and cool. If it is being consumed there are other reasons IMHO.
It's funny how many people will accept as normal, the burning of a quart of oil every 1000 miles, yet not change their drving habits and oil viscosity.
#12
Originally Posted by MMD
I'm also wondering if 5-40 or 5-50 (both approved by Porsche) might at least theortically give less "uneven soot" problems on the tailpipes than 0-40... .
Last edited by wross996tt; 07-30-2006 at 07:10 PM.
#13
Rennlist Member
M1 0w40 is a very capable oil...good enough to do 12-15,000 OCI's if you are so inclined...i can post used oil analysis reports if anyone has an interest in seeing them. The Carrera Cup series in Australia (really hot weather) is using a Fuchs Silkolene 0w20 with great success. Those engines are rebuilt more often of course, but the wear rates and tests show terrific protection. Oil that looks dirty means the oil is doing its job and keeping contaminants in suspension. FYI,there is absolutely no way to judge an oils suitability based on color. It has been proven many times over in many different climates and engine types that a heavier weight oil does not necessarily give better engine protection.
#14
Originally Posted by MMD
Darn. The 2006 manual sez:
Brant, BTW I agree completely!
#15
Race Car
Originally Posted by wross996tt
Just a clarification...according to TSB 1701 1/05 (7/28/05) only 0W40 and 5W40 are approved by Porsche.
That TSB shows that 5W50 IS approved.