0-20 motor oil

[tolian21]

I can't remember a single UOA where oil viscosity alone made any significant difference with wear metals. Maybe they exist...but I can't remember any.

I cant remember any UOA that said oil is bad …

 

[wemay]

I cant remember any UOA that said oil is bad …

What constitutes bad oil from a UOA for you?
Low TBN
High TAN
Dilution to where oil is a lower grade
High wear numbers
Higher flash point

 

[tolian21]

What constitutes bad oil from a UOA for you?
Low TBN/TAN
Dilution to where oil is a lower grade
High wear numbers
Higher flash point

Low TBN and high wear. 99% of UOAs say everything is OK.

 

[wemay]

Low TBN and high wear. 99% of UOAs say everything is OK.

I'd say that's because the folks sending in samples are maintenance conscious and tend to care about this kind of thing more than the average consumer. The vast majority of UOA are also analysis of Synthetic Oil at ~5K miles.

 

[kschachn]

Plus people are still relentlessly trying to use a UOA to measure "wear rates" between oils.

 

[ARCOgraphite]

Lugging is not based on just the rpm of the engine but the load as well. 1200rpm in first gear is not lugging. 1200 in fourth or fifth gear, now you’re lugging.

True, but most all cars/truck run this rpm -programmed to go to top gear above idle ASAP.
Thus the issues with pinging on regular gas with 12:1 compression - even with VVT and variable intake runner length and tumble valves.
Old flathead engines had low compression and high velocity intake charge at these rpm and would pull fine at 1200 rpm. The want for High advertised power that apparently no one uses ( other than Motortrend) has ruined drivability more than we remember

 

[ARCOgraphite]

The reputation of the GM 3.6 is pretty terrible. It doesn't do well with the timing chains and tensioners. If you go the manufacturer recommended OCI it'll still kill the chains and you'll have to drop a boatload of money to have them done.

The Pentastar 3.6, however, has been pretty good.

GM is like,
'What this "overhead cam" thing"? We may have to try it out!

 

[PimTac]

True, but most all cars/truck run this rpm -programmed to go to top gear above idle ASAP.
Thus the issues with pinging on regular gas with 12:1 compression - even with VVT and variable intake runner length and tumble valves.
Old flathead engines had low compression and high velocity intake charge at these rpm and would pull fine at 1200 rpm. The want for High advertised power that apparently no one uses ( other than Motortrend) has ruined drivability more than we remember

Whether we like it or not, the computers are running the show anymore.

 

[CKN]

Do you not change any of the “lifetime” fluids, either?

The transmission gets changed at 50,000- due to towing. And then usually traded in before 100,000 miles for a healthy down payment on a new one. Other than oil changes that's it.

 

[kschachn]

The transmission gets changed at 50,000- due to towing. And then usually traded in before 100,000 miles for a healthy down payment on a new one. Other than oil changes that's it.

Holy cow that's all they are good for?

Aren't you referencing a truck that is ostensibly for towing?

 

[BMW Dom]

Holy cow that's all they are good for?

Aren't you referencing a truck that is ostensibly for towing?

He means the transmission fluid.

 

[kschachn]

He means the transmission fluid.

Ahh I see.

 

[CKN]

He means the transmission fluid.

Yes- the transmission Fluid.