Mobil one
http://www.amsoil.com/storefront/sso.aspx

Yellow Cab is the giant cab company in Chicago.
They change the oil on the Crown Vics EVERY TWO WEEKS no matter how many miles have been driven...which, on average is about 2,000, which you'll note is under the old 3,000 on the non-synthetic motors.
A cab driver told me he had 300,000 miles on the cab, and that the engine had never been rebuilt or repaired.
You can trust that a big company with multiple thousands of cabs on the road has done a cost/benefit analysis, and they have made their statement...Changing the oil more often than not makes economic and financial sense, after all, these guys don't throw away money...like our politicians do
Last edited by chgoblue; May 23, 2010 at 05:34 AM.
At the risk of starting a filter war in the middle of this oil war, I use the Delco UPF filters on the Corvette.
Joel
I just switched from Pennzoil Platinum to the new Ultra a month ago. Ultra has some impressive specs and the first couple of used oil analysis reports that have already shown up on it look very good. I have gotten great oil analysis results in the past few years on Pennzoil Platinum and I have no doubt that Pennzoil has improved Ultra even more, so I'm confident my analysis results will be even better in the future.

yes so does the 5W30 ASL and the 10w30 ATM
I run the SSO 0w30 in my yukon and Z06. I use to run Mobil one but the engine runs quiter in the Z and I get better mileage in the yukon. Just this past week I recorded 21.3mpg heading up to Duluth all highway - not bad for 4wd suv. The Z I don't really care about the mileage to hard to judge with all the construction around Milwaukee.
On a side note for those running Mobil 1 EP. Mobile 1's extended drain interval is only 7500 miles for domestic cars and 15000 for euorpean cars. I don't remember the exact wording of it but did notice it on the bottle.





The Best of Corvette for Corvette Enthusiasts





http://www.imakenews.com/lng/e_artic...W6PM,b1M25KBSe
By George Gill
Royal Purple Ltd. was black and blue after BP Lubricants USA took it to task over advertising claims for its synthetic motor oil, finding a receptive audience in the advertising industry’s self-regulatory forum.
The National Advertising Division of the Council of Better Business Bureaus recommended Porter, Texas-based Royal Purple modify or discontinue numerous advertising claims for its synthetic motor oil, following a challenge by Wayne, N.J.-based BP Lubricants. The NAD examined comparative performance and superiority claims in print, broadcast and Internet advertising. In some of the advertising, Royal Purple compared its performance to Castrol, Shell, Amsoil and other motor oil brands.
NAD recommended that Royal Purple discontinue its use of consumer testimonials reporting specific performance attributes in the absence of reliable independent evidence showing performance capability.
“Anecdotal evidence based solely on the experiences of individual consumers is insufficient to support product efficacy claims, including claims related to horsepower, torque, fuel economy or engine heat,” the organization stated. “While the advertiser may quote from published articles if it provides clear and conspicuous attribution to the publisher, it may not rely on such articles to support efficacy claims for which it has no reliable independent validation.”
NAD recommended Royal Purple discontinue claims such as “Increases horsepower and torque by as much as 3 percent,” “Reduces Engine Wear by 80 percent,” “Superior Oxidation Stability” and “Provides Film Strength Up to 400 Percent.”
“If industry-standard tests or tests with carefully documented controls were abandoned, there would be no basis whatsoever for making any meaningful claims about the relative efficacy of motor oils,” BP said in its challenge.
NAD recommended that Royal Purple discontinue claims that stated, “Improves fuel economy by as much as 5 percent” and “Fuel economy improvement up to 5 percent or more” because its Environmental Protection Agency testing was inconclusive and the “Oklahoma State Study” and single cylinder Labeco CLR diesel engine testing cited in Royal Purple’s advertising was not relevant. The NAD noted the 1997 OSU Study was “outdated and nothing in the record demonstrated that the formulations of the competitors’ oils were similar to those available for sale on the market today.”
BP Lubricants said it hired the independent laboratory Southwest Research Institute, in San Antonio, to analyze power output of gasoline engines with Royal Purple Oil and with BP’s Castrol oil for comparisons. “The results were provided to the challenger’s expert statistician who was not informed of the identity of the candidate oils,” NAD stated. “The challenger’s [BP’s] expert determined a 0.9 percent difference in power between the oils, which did not rise to the level of statistical significance, and is well below the 3 percent claim made by the advertiser.”
SwRI did additional tests to independently determine the differences in fuel economy, emissions data and engine temperature between Royal Purple and Castrol motor oils. According to SwRI, “there was no statistically significant difference between the fuel economy, emissions data or engine temperature between the two candidate oils,” NAD said.
Following its review of the non-anecdotal evidence in the record, NAD recommended that Royal Purple discontinue the claims, “Reduces emissions up to 20 percent or more” and “Reductions in emissions of 20 percent or more” because the studies on which the claims were based were outdated and not consumer-relevant.
NAD also recommended the advertiser discontinue its unsupported claim that Royal purple motor oil is “API/ILSAC Certified.” Noting that API and ILSAC licenses and certifications have many categories with different meanings, the NAD recommended that the company discontinue its claim that its synthetic oils are “generally ‘API/ILSAC Certified.’”
In fact, no Royal Purple products are certified to current ILSAC specifications.
The American Petroleum Institute licenses its trademarked Service Symbol, or ‘donut,’ for display on qualified engine oils, and also licenses the ILSAC ‘starburst’ logo for oils that meet the auto industry’s latest energy-conserving standards. In API’s online directory of licensees for its Engine Oil Licensing and Certification Program, Royal Purple has a total of 23 passenger car and diesel engine oil products listed, all licensed to use the API donut. Five of these may additionally display the words ‘energy conserving’ within the donut logo, but none of the Royal Purple products are licensable to the current ILSAC GF-4 specification and they cannot display the starburst logo.
Royal Purple also voluntarily agreed to discontinue the claims, “most advanced,” “unsurpassed performance” and “unparalleled performance,” steps the NAD said were necessary and proper to avoid confusion in the marketplace.
“While Royal Purple also believes that the tests and testimonials it supplied as evidence accurately portray the benefits of using its synthetic oil in a wide variety of applications, it defers to the NAD’s position that those tests and testimonials alone are insufficient to support specific performance attribute claims in consumer advertising,” the company said in its response to NAD. “... [Royal Purple] has already made changes to its advertising in accordance with the NAD recommendations and will continue to implement NAD’s recommendations and analysis in developing Royal Purple’s future advertising.”
BP Lubricants did not return phone calls from Lube Report requesting comment on NAD’s decision.
George
The fact that seems left out of these discussions is that since the time when 3/3 probably made sense (at least 30 years ago), nearly all the factors that drove that need have improved.
=====>> We've gone from carburetors that left our primitive engines' primitive oil awash in surplus primitive gasoline, to very precise fuel injection. Cars with fuel dilution are now viewed as troublesome exceptions to the norm.
=====>> We've lost the lead in our fuel, which used to leave a massive mess in an engine's oil.
=====>> Crankcase ventilation systems have advanced lightyears ahead of what we used to have, leaving our oil much cleaner and drier than it used to be.
=====>> Our engines are now programmed to warm themselves much more quickly and effectively than they did before (making short tripping less dangerous than it used to be).
=====>> Ignition systems are now much more powerful and precise, contributing to much cleaner burning than we ever had before.
=====>> And then there are filters -- much better too at cleaning than in the past.
=====>> And finally, then there's the oil itself, which is so much better now than it was before that it's amazing, and this would apply to both syns and dinos (most of which are now about as good as a syn anyway).
When you consider that virtually EVERY factor that used to weigh heavily in favor of the short 3/3 has changed hugely in our favor, it seems nearly laughable that oil companies and quick lube chains are still pushing 3/3 with a straight face.
Intial drain period...............first 4,000 miles.
Favorable Operations-(over 10 miles avg per trip).....every 4,000 miles
Summer(over 32* avg outdoor temp)..........Every 2 months or every 4,000 miles, which ever came first.
Winter (below 32* avg outdoor temp)....every month or every 4,000 miles, whichever came first.
Dusty driving conditions.....every 1,000 miles.
change oil filter element...every 6 months, first 4,000 miles or every 4,000 miles, which ever came first.
Intial drain period...............first 4,000 miles.
Favorable Operations-(over 10 miles avg per trip).....every 4,000 miles
Summer(over 32* avg outdoor temp)..........Every 2 months or every 4,000 miles, which ever came first.
Winter (below 32* avg outdoor temp)....every month or every 4,000 miles, whichever came first.
Dusty driving conditions.....every 1,000 miles.
change oil filter element...every 6 months, first 4,000 miles or every 4,000 miles, which ever came first.
I am going to start running the Pennzoil, have also heard good things about it.
On a side note there was some discussion on SVT Performance or LS1 Tech that Mobil 1 wasnt the cats *** since Exxon bought them out.....dont know if this is true or not?


















