Yes, but that was in my LT1 Firebird, which is basically a modern small block Chevy 350, so it's clearances would never like a thinner oil like G Man's engine obviously does.
Not too often. I don't have a lead foot, so full throttle only happens if I need that much power. On this run, probably no more than two or three times, and I can only remember the tach seeing the redline one of those times in 2nd gear (merging into traffic on the Interstate).
By bunch, I meant a grouping of UOAs such as yours. Thats why I referred to Patman's UOAs. I'll search for his when I get a chance, unless, he has his in a nice pretty chart already. Patman, you got a chart of your UOAs handy.
Here might be the key. A well built modern engine with relatively low miles, driven conservatively might do well on these oils. My usual drivng habits entail at least a half dozen full throttle runs and as many meetings with the redline, daily.
I tend to agree with this statement after observing several UOA's over the past year or so.
Vette,quote:
Originally posted by 59 Vetteman:
Last Z,
I have a diesel truck that calls for 15W40 oil and I am running a 5W30 oil in it year around pulling an average load of 8K. So back to your viscosity/additive theory, you may want to reassess it. JMO
The verdict is in from Terry. I'll keep my comments general. Since Terry considers his interpretations proprietary, I'll let him comment on specifics if he so chooses. Here's a brief synopsis, though: The few metal numbers that increased marginally are from other sources; not wear. To say that Terry was blown away by the low iron number would be a monumental understatement. Drop in vis not an issue since oil is still a solid 20 wt.
And after all the other posts, I still have not changed my opinion.quote:
Originally posted by 59 Vetteman:
You are correct in that the analysis by Terry will be interesting.
My own opinion is that we on the board spend all day arguing about viscosity. If your wear metals are low, and insoluables are low, no fuel dilution, who really cares about the Vis number. Wear is the reason for doing an anlaysis along with potential problems. JMO (and I am not changing it)
Factor in some fuel dillution with a 20wt that shears like this , a few trips to redline and or both makes for a 5w-30 that shears to 9.2cSt a far better choice for an engine the maker called for a 30wt originally ... IMO of course
quote:
Originally posted by Last_Z:
Ditto !
Well heck, that does it. I'm immediately dumping all the oils out of my vehicles and filling them with 0w-5. That should bring the flow rate up!
I agree with this. I'm not saying I'd use a 20wt in every engine or every condition, but the oils are aparently working well for most daily drivers. It's a good point though that Z makes in that you do have a margin of safety with the 30wt oils. These 20wts though are just impressive though and could be formulated with better/more additives and actually in some cases be better then the 30wt counterparts. Look at M1 0w-20. Doesn't that outperform the M1 5w-30? I think it does.
