Oil: 10w-30 is the Mazda recommended oil for a 1991 model
04-07-09, 06:29 PM
#1
Senior Member
Thread Starter
Join Date: Feb 2007
Location: Rock Hill, South Carolina?
Posts: 316
Likes: 0
Received 1 Like
on
1 Post
Oil: 10w-30 is the Mazda recommended oil for a 1991 model
I have the owners manual as well as the 1991 Workshop Manual. Both only have 2 oil grades recommended. 5w-30 for below freezing and 10w-30 for everything over -10 degrees Fahrenheit.
This is in contrast to what is recommended in the 1989 FSM available on the web and what is also listed in the FAQ's. The other difference I noticed is that the oil grade that was recommended, changed from SF in 1989 to SG in 1991. This may have been the primary reason in the change. The engines should be the same so they may have changed it based on the improved quality of oil under the new rating or based on new emissions standards requiring a different oil weight.
If anyone has information that enlightens this change or supersedes it then please share. Remember the 1991 manuals are newer than the 1989 manuals. I do not want to see a bunch of post where people say what oil they use but have no valuable contribution. I had been using 20w-50 but plan to change to 10w-30 based on this discovery.
This is in contrast to what is recommended in the 1989 FSM available on the web and what is also listed in the FAQ's. The other difference I noticed is that the oil grade that was recommended, changed from SF in 1989 to SG in 1991. This may have been the primary reason in the change. The engines should be the same so they may have changed it based on the improved quality of oil under the new rating or based on new emissions standards requiring a different oil weight.
If anyone has information that enlightens this change or supersedes it then please share. Remember the 1991 manuals are newer than the 1989 manuals. I do not want to see a bunch of post where people say what oil they use but have no valuable contribution. I had been using 20w-50 but plan to change to 10w-30 based on this discovery.
04-07-09, 08:15 PM
#3
'89 Owners Manual
5-30 <32 F
10-30 -10 to 90
10-40 >-10
10-50 >-10
20-40 >20
20-50 >20
The '91 5-30 and 10-30 recommendations are probably listed to try and achieve the best fuel mileage. 10-30 will present no problem and be lighter and less resistance than the 20-50.
Whether you want to hear it or not, I use Rotella15-40 in the TII.
5-30 <32 F
10-30 -10 to 90
10-40 >-10
10-50 >-10
20-40 >20
20-50 >20
The '91 5-30 and 10-30 recommendations are probably listed to try and achieve the best fuel mileage. 10-30 will present no problem and be lighter and less resistance than the 20-50.
Whether you want to hear it or not, I use Rotella15-40 in the TII.
04-09-09, 10:39 AM
#7
Full Member
Join Date: Jan 2008
Location: Calgary,AB
Posts: 91
Likes: 0
Received 0 Likes
on
0 Posts
Yes. 10-30 should be fine for you where you live all year round, just make sure it's a quality brand. You can run synthetic if you want but not really necessary. If you do decide to go this route though, make sure you only get top of the line synthetics (ie: Royal Purple) cause lower quality ones tend to leave more carbon deposits in your engine.
I found the Mazda recommended oil chart list a headache because there's a lot of overlap in temperature ranges.
I run 5-30 in the winter but only because it can, and often does, drop to about -30F where I live.
I found the Mazda recommended oil chart list a headache because there's a lot of overlap in temperature ranges.
I run 5-30 in the winter but only because it can, and often does, drop to about -30F where I live.
Trending Topics
04-09-09, 08:27 PM
#8
Royal Purple false marketing claims
http://www.imakenews.com/lng/e_article001398592.cfm
April 8, 2009
Truth in Advertising: BP v. Royal Purple
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.
http://www.imakenews.com/lng/e_article001398592.cfm
April 8, 2009
Truth in Advertising: BP v. Royal Purple
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.
05-06-09, 04:59 PM
#9
Senior Member
Thread Starter
Join Date: Feb 2007
Location: Rock Hill, South Carolina?
Posts: 316
Likes: 0
Received 1 Like
on
1 Post
I was looking through a reprinted owners manual for a December 1990 build '91 vert and it had suggested oil specs similar to the older cars as well as having a similar under hood sticker as the older cars. My car is a May 1991 build (Old enough to smoke) and does not have an under hood sticker. I am still going to go with the 10w-30 since my car is newer and his reprinted in the USA manual is kind of funny. Anybody have some newer specification facts to share?
05-06-09, 06:25 PM
#10
every car manual has an oil weight rating relative to climates.
Follow that chart from the coldest winters you've has in SC to the hottest summers, in degrees Fahrenheit, and find which bar covers both and theres your viscosity.
Because i live in TX, i use 20/50 in spring and summer and 10/40 in fall and winter.
Follow that chart from the coldest winters you've has in SC to the hottest summers, in degrees Fahrenheit, and find which bar covers both and theres your viscosity.
Because i live in TX, i use 20/50 in spring and summer and 10/40 in fall and winter.
Thread
Thread Starter
Forum
Replies
Last Post
rx8volks
Canadian Forum
3
08-20-15 10:24 PM
