On Sunday, August 27, 2017 at 11:07:52 AM UTC-4, Scott Dorsey wrote:
In article , 83LowRider wrote:
On 8/19/2017 8:54 AM, Bram van den Heuvel wrote:

A study of automotive gear lubes
http://www.technilube.com/brochures/...hite_paper.pdf

Regarding synthetics in general --

"the AAA study didnt go light on the research and took a comprehensive
look into all the factors involved."

€œAAA found that synthetic oil outperformed conventional oil by an
average of nearly 50 percent in its independent evaluation, offering
vehicles significantly better engine protection for only $5 more per
month when following a factory-recommended oil change schedule.€�

This is good but... what does "synthetic" mean? A lot of the oils sold as
"synthetic" in the US are not in fact made from synthetic base oils at all,
just very highly purified ones.

And as it is, conventional oils vary considerably in their protection, because
the additive packages vary so much.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

IDK how much they actually vary, assuming they meet the same API
standards. That sets a floor under how they perform. And typically
vehicle manufacturers use that to specify what oil can be used.
Though I think some years back some manufacturers started specifying a specific
brand. How much that's based on how they actually perform and
science versus marketing BS, IDK.

And then you have to wonder about auto manufacturers pushing the oil
change mileage and what's really behind it. BMW for example went to
15K many years back. More recently, they backed it down to 10K.
They also included free oil changes as part of their included services.
So, who was the 15K really benefitting? The engine and long term owner
or BMW not having to change the oil for free as many times?