What is it?

 

The best oil for the LT1 under most conditions is Castrol Syntec 0w-30 specifically labeled "Made in Germany".

I say best based on seeing Used Oil Analysis reports from a lot of different users.

You can send in samples of used oil and they measure the wear metal content, some contaminents and some things that have to do with how well the oil is actually holding up to use.

 

mobil 1 syn5-30 or royal purple syn 5-30 ,theres an oil called motul thats supposed to be pretty damn good i do know its used in alot of high performance race crotch rockets

 

How many race crotch rockets have LT1 engines?

 

What LT1 specific data are you using to suggest these are good oils for this application?

 

I picked up a couple hp and tq just by switching to royal purple so that says something to me. And I also saw a test done with a couple different motor oils and royal purple was the only one that passed as an over the counter oil. And it did not just pass it blew the competition away.

 

My car also seems to run better and smoother with royal purple than any other oil I have used. And I have tried all the top names castrol, pennzoil, valvoline, quaker and even mobile 1.

 

You have Used Oil Analysis done?


I know at one point RP did not hold up atall to street use, was fine for racing and really short drain intervals but the running joke was

"it shears out of range just pouring it from the bottle"

Meaning it took VERY little daily driving use to shear the oil down to a thinner weight.

 

That's hardly hard data to back up your claims. I've heard similar things about RP that 96capricemgr posted. Their gear oil, for instance, failed testing miserably.

http://www.amsoil.com/products/gearl...hitePaper.aspx

 

Go to Bobs the oil guy forum, and confuse yourself silly. Oil analysis is the only way to tell what your particular engine needs. Too many variables throughout and engine rebuild, climates, abuse of the engine etc etc.
Personnaly I use Mobil 1, because wal mart generally has it, and my Vette came with it.
I took my abused LT1 out, at 130000 miles and the cross hatch marks were still on the cylinder bores. I used mostly mobil 1. But that was my engine.
Dont get caught up in oil too much. Just worry when it is low, past recommended mileage and using oil/

 

http://neptune.spacebears.com/index.html in-depth study, done on LS1 but I'm pretty sure the bearings, contact surfaces, and crankcase conditions are very close in similarity

 

I use Royal Purple. The best I've found so far.

 

think with ur dipstick jimmy

 

Based on what measurable data?

 

i did see it on horsepower tv once where they switched motor oil, tranny fluid, and gear oil in a car with royal purple and picked up quit a few horses from doing it. they did a before and after dyno. but wasent an lt1