Originally Posted By: tig1
Buster,
The 4 ball wear test is useless for engine oil. Mobil explains this on their web site.
The local RP rep has been trying to get me to switch to his products in the steel mill machinery I am responsible for, so he brought his little test device in for a demo. He performed his test with his RP motor oil, then asked for a sample of the gear oils we use. We use Mobilegear both dino and SHC versions in ISO 220 and 460W. In a nutshell, the RP outperformed our Mobile products in a dramatic fashion. They are on to something, don't know what??? Bottom line, well I have one lube reservoir that holds 500 gal. and the cost to switch this one unit was going to cost something like $40,000. Pretty hard sell in this economy, especially since we are not having any problems with the Mobile product.
On the Fe in a UOA, nobody seems to mention the filter used during these tests. It can make a difference.