I got a '57 Chevy convertible for my 16th birthday in 1962..My Dad said .."Change the oil and filter...and use Valvoline"..Been doing it ever since..

 

This kind of comment & advice is total hearsay, there is no way to know for how long any
particular oil has been installed in any particular engine and the use & abuse the engine
has been subjected to.

Trying to blame sludge build-up exclusively on the brand of oil installed is both
irresponsible & invalid.

 

im sorry if i offended anyone in anyway let me restate what i was saying for the past 5 years i have seen cars and trucks alike use quaker state and penzoil and only go 3000 miles and have sludge in thier cars i have also seen little or no sludge in cars and trucks that use valvoline or castrol you can use any oil you prefer just this is my experince sorry

 

I am going to have to agree here with ctubutis...

There are many variables that contribute to an engine's cleanliness. We don't know how clean the engine was before the oil was used...how long it was installed for...what driving conditions or even dust conditions the engine was subjected to or even the state of the engine itself. The oil could actually be cleaning the sludge but the lack of maintenance could finally be breaking up.

For all we know, it just so happens that people who put in Quaker state oil do so when they feel their engine not performing well...thus the oil breaking up the built up sludge.

In all fairness...it's like me saying that Mobil 1 is the best but maybe I'm just changing the oil enough to never build up sludge and thus never letting the engine get dirty enough to eat itself alive.

Everything's relative...opinions, experience and advice. But then again...this is why we have forums...to express just those things...

 

Here's a great article: Oils Against Oils
Oils Against Oils - Major Oil Brands go head-to-head on the dyno.

 

Did not expect to see Royal Purple to rate as low as it did...very interesting.

 

after reading this thread i went out and got 5 qts of mobil 1 synthetic 10w30 high millage...

$32 with the filter seemed like a good deal...

 

I would recommend picking and oil and sticking with it. With each manufacturer having different formulas I would think using a different oil each time would lead to sludge.

 

the biggest dealbreaker for me when choosing motor oil is: is it on sale and does it come in a 5 qt container. I'll go with either 10W-30 or straight 30. I don't worry about the ZDDP thang at all, and every vehicle I have, two trucks and a Bronco all have flat tappet cams, not aggressive profiles but broken in, you know, 2500 rpm, carb primed, timing set, etc.

I still have problems with FL1As emptying out while sideways and getting some knock upon startup. not real happy about that. seems like if you let the truck sit for a few days or more it will empty out.

I use the 3000 mile oil change interval.

 

Nobody I know likes penzoil or quaker state, I've heard penzoil is not good, and quaker state is complete crap. So this sound right to me, I'd never use either. I like mobile1 for my truck. And I usually have some Rotella laying around because it's rated to run in anything.

 

Any aftermarket tests on Motorcraft Oil, to determin how good it is compared to the others?

 

Question why is everyone here running 10w instead of 5w? I'm running 5w ss, and am happy.

 

I'm running Rotella 15W40 "diesel oil" since we have a 55 gallon drum of it.

 

10W-40 is the recommended weight in my owners manual. After that, 10W-30. So maybe that's why? Although 5W-30 may be better in colder climates (if my understanding of multi-viscosity numbers is correct).

 

0W-40 is what i run...