macr88

^ good to know, didn't think about the type of pump that's used

thank you for the info

Gernby

Here is the new UOA with TBN after 1300 miles on Redline 5W-20. Looks pretty good.

iDomN8U

Question is how low will the viscosity go, already down from 9.1 to 7.81 in 1300 miles

zeroptzero

cool information. The wear metals are actually a bit high for 1000 miles, but that's likely residue floating around from high levels in the previous runs. You could almost use this as the baseline and then sample again after 4000 miles (or whatever you choose) the increase in metals might better represent the actual wear. I think the next sample will be the most revealing.

I thought viscosity would read a bit higher than that.

Thanks for keeping up with the info on this thread.

Gernby

I will sample it again at 15K miles (4K on oil) to see how it looks. I'll wait to actually change the oil until I get those results. BTW, I did make a minor sampling error with this oil that may have effected these results some. I took the sample while the oil was cold, after about a quart had already drained out (during the install of my fumoto drain valve). I won't do that next time.

SpitfireS

The only thing that I'm slightly dissapointed about is the viscosity after 1300 miles.
How about mailing Redline?
Ask them why / how this top ester oil sheared down so quickly?
Maybe its designed to do so (maybe Redline will not admit it, if that's the case)
Its not the fuel(dilution).

I would not take this as a baseline.
Your engine is still (kinda) breaking-in.
IMO it will take at least one oil change and some miles to get a good base line.

Thanks for posting

INTJ

Agreed. And as is widely posted on BITOG (and MACR88), the first redline change will yield high metals from cleaning the old oil.

starchland

Why would an oil be designed to shear down? And could the viscosity be from old oil lefto

Gernby

I let the old oil drain for about an hour while it was hot, and put 5 quarts of Redline back in. There would not be much of the old oil mixed in, and even if there was, the old oil had slightly higher viscosity than this last sample anyway.

SpitfireS

starchland Posted on Feb 18 2010, 08:47 PM
What I meant was: temporary shear turning into permanent shear.
Some oils are designed to temporarily shear down in crank journals ("tight spots") to reduce internal oil friction (= less fuel consumption) but maintain viscosity in "open" lubrication situations like cam followers, timing chains, ect.
Once the additives that control this behavior loose their ability to do so the oil shears down permanently.

On second thought: this Redline most likely isn't one of those oils.

Maybe do a VOA of the Redline 5W-20?
Is there a batch# on the Redline bottles?
To get close to the bottom of this one could ask Redline how batch# xxxx of 5W-20, with a VOA of 9.0 cSt (just a guess) shears down to 7.81 cSt after 1300 miles?

Or..... post the UOA on BITOG and ask overthere?