Great link ! I love scientific data that proves a point. The reason there is a market for these additives is people are uneducated in the complexities of mechanical engineering and lubricating principles. Motor oils are engineered for the application at hand,period. Many testimonials of engines running 200k,300k on Dino and synthetic without the help of snake oil.

 

If thin oil gets up into the engine faster, it also drains down faster. I do multiple starts between 10-15 minute stops, more of my 40w is up in the engine than say 20w. Our Jeeps are old and have more blowby than when they were new. Run thin oil and more oil ends up blowing past the rings and ends up sucked into the intake which does many bad things

1) Blowby oil reduces octane, increases detonation, the OP said he heard a light knock using 30W
2) blowby trashes your cat, thats why the feds took the zinc out
3) blowby increases carbon inside the cylinder and coats your intake valves with burnt oil
4) blowby increases emmissions
5) blowby fouls sparkplugs whether they are copper , platinum, etc

New cars run 20w to meet CAFE standards. Many vehicles that use 20w have an oil seperator that returns blowby to to the oil pan. At some point it makes sense to start running thicker oil in high mileage engines. Also, thicker oil increases hydraulic cushion which is why some engines run quieter with thick oil. Manual trannies are semi- notorious for advanced thrust bearing failure, AKA excessive crankshaft endplay. Makes sense to me that a thicker oil would be better for those with stickshifts.

 

what is dino juice?

 

It's the byproduct of dinosaurs that died millions of years ago, otherwise known as oil.

 

lol byproduct - it IS dinosaurs. And fish and trees and moss and birds and algae and and and...

 

ok.. just never heard that term.. my bad

 

Have you tried a higher octane fuel to see if the knock goes away?

 

i only notice it when its idling and oil pressure is at 25 hot, no ping or knocking under acceleration

 

I just scanned this thread and I don't see an answer to the question: What brand of oil filter do you have on there now?

 

At idle there is high vacuum and it's gonna suck alot of oil which reduces octane, and creates knocking if oil is excessive. If a higher octane fuel makes the knocking go away at idle, switching to a heavier oil should fix the issue.

 

I'm having a really hard time with this oil reducing octane at idle stuff. No offense but this ain't my first rodeo.

Not to mention there are numerous reports of cheapie oil filters causing knocking at idle. Pinging is caused under compression, high load and heat. I've never had a vehicle ping at idle.......

 

oil being burned is diluting fuel?

 

This is pure bull****....oil will not reduce octane. Sorry...

 

Which burns faster? Fuel or oil?

 

No burning oil would cause the knock!