Where do you guys think this extra iron is coming from?
First thought, piston cylinder walls. You are using a lubricant with low HT/HS High Temp/High Shear sub 3.0 range. HPDE suggested lubricants are in the 4.5-5.0 range.
Where do you guys think this extra iron is coming from?
That's interesting. I haven't done much research into the relationship between oil specs and engine wear. The ring / cylinder wall interface is certainly high temp, high shear.
Did I read in another thread that you run at the drag strip with 20w oil and without issue?
Agreed.Yes you did, but that's a bolt on only car at short throttle bursts, not sustained high engine rpm. The engine in a drag car will never achieve and maintain as high of heat levels as an engine on a twisty track.
Agreed.
But, towing would be similar, to a lessor degree. Long periods of high load operation. It's not uncommon to have trucks spec'd for 20w oil.
Agreed.
But, towing would be similar, to a lessor degree. Long periods of high load operation. It's not uncommon to have trucks spec'd for 20w oil.
I wouldn't call it very similar or the same order of magnitude. GT or Boss on the road course will see much higher average and sustained RPM. And all the HP is made up top. Sure, towing is hard on the oil, but I really doubt it gets anywhere near the abuse levels at the track.
Agreed that RPM is definitely going to be lower on average.
I said similar, but not the same order of magnitude.
If we are looking to the ring interface for excessive wear, cylinder pressure acting on the back side of the rings is what forces them against the cylinder walls, and it peaks at maximum torque (generally well below max RPM).
RPM plays a part too, in the speed and frequency of the motion. But think about the average amount of time spent between someone who tows a lot, and someone who turns a few hot laps now and then.
Received more UOA's, will be updating the chart soon. Added the current recommendation list to post #1 for easy reference.
Any UOA's on Driven oil?
Hello,
I'm new to this site, and have been reading on UOA threads which are about 6 months old, but new and interesting to me. I bought a 2013 Roush Super Charged mustang about 9 months ago with 1,200 miles on it. I put, 3,500 miles on it and assume that it has MC 5w-50 synthetic oil in it. You recommend the AZF 0w-40 for the type of driving I do which is, daily driving to the store, occasional open throttle, but no track racing type use of this car. Should I have the 5w-50 analyzed even though its obvious on your comparison charts that it shears rapidly. And / Or should I analyze the 0w-40 after maybe 9 months of service which would be about 5k miles. Also wondered if there was a comparison chart for Roush supercharged vehicles or would it probably fall on the 302 chart ?