3406E..which oil?

[bob h]

Using a syn trans fluid in engine? Come on, you can't be serious. There is no comparison of a syn trans fluid and a syn engine oil. Kind of a rediculous comment.

My response clearly reflected your suggestion that syn is the "recommended lube" for an internal combustion engine based on Eaton's preference for syn lube in their gear boxes, as typed by you here:


[QUOTE=Copperhead]"""It would take a science lecture, of sorts, to explain all the benefits of a synthetic. Just ask Eaton.... for their extended warranty protection of transmissions and rears, they require a synthetic oil be used. Why not do the same for an engine?""" UNQUOTE


...NOT taken out of context

[bob h]

I will agree that most of today's oil are pretty darn good products. However, they are Group II oils. Some synthetics (Rotella, Castrol, etc) are Group III, and a few are Group IV and V. I presently use a Group IV in ALL the components of the truck... engine, trans, rears, etc. The performance characteristics of a Group IV synthetic are heads and shoulders above a Group II dino oil. A Group III is just a highly refined Group II using a process called hydrocracking. It is not even allowed to be called a synthetic in most countries. But it is a nice marketing move in this country.

I'm not concerned which group my oil comes from as long as it meets the manufacturers specs, I could care less if it was cracked all the way to gasoline so long as it protects internals like it should. I've already expressed my feelings on oil quality.

Gold is a better electrical conductor than copper, but it's obviously not cost effective for carrying starter current. If syn is 4x the cost of mineral per gallon, and my oil change intervals are only doubled, my cost-per-mile has increased... so, where is the benefit?

Is synthetic a superior lubricant? Yes, I don't think that's debateable. Is it cost effective? that's what I don't know, and that's why I ask questions about it.

And, I can tell you this; when I roll my engine bearings out at 1,000,000 miles, they will be in serviceable condition with EITHER lube... therefore, I need a dollar benefit; If i'm investing, I want something back!!!

[Copperhead]

....Cool