The only measure of Engine Lubricant performance that any Automotive Engineer will recognize is the effect on emissions (lower emissions is better; poor lubricant will increase tail pipe emissions by up to 20%); duration of such effect (over useful vehicle life as defined by Clean Air Act = 75,000 miles or 150,000 miles if PZEV in California ONLY); effect on fuel consumption (less fuel used when compared to "control oil SAE 20W-30" is better); duration of the fuel consumption effect (only 2,000 miles for most API licensed oils, and over 82,000 for SynLube)
1.8% MPG improvement City
3% MPG improvement Highway
Emission reduction compared to SAE 5W-20 OEM Fill 50% on average. (CO, HC, NOx)
Emission at 100,000 miles lower than OEM (FORD)certification test at 4,000 miles
NO OTHER LUBRICANT AT ANY PRICE CAN DO IT.
Project Description: SynLube Lubricants Long Term Test
AAA Project Identification Number: 81
Project Number: 2002-0317-1
Project Begin Date: 2/26/2002
Project Finish Date: 7/6/2007
NO OIL COMPANY can or ever will run a test for 5 years, as every 3 to 4 years they change the formulations, mainly because they are unable to meet the latest OEM specifications with their current products.
Sensible people will argue for 5 years or more when they do not have any proof, but since their ego was hurt because they can not afford a decent vehicle and drive what US Congress (hey you elected them ?) determined to be a CLUNKER (anything that is pre 2001).
If vehicles are as durable as some of you think they are why do 14 to 16 million vehicles annualy get junked ?
And why are you not still driving 1950's someting ?
PS: IRS defines even today "vehicle useful life" to be 5 years or 50,000 miles - so if you have ANY legitimate business you can depreciate it to ZERO in those two alternatives.