MazdaSpeed on Engine Oil
11-13-2004, 12:44 PM
#26
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Originally Posted by quack_p
...The U.S. manual also recommends shift points of 12, 22, 29, 36, and 46 mph ...Now it seems obvious to me those shift points are intended to improve the car's fuel economy...
11-13-2004, 12:47 PM
#27
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Originally Posted by valpac
I know its off topic, but has anyone tried these SP's to improve gas mileage? Results? Looks kinda dull though.
11-13-2004, 01:06 PM
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Originally Posted by bean438
So, how many licks DOES it take to get to the center anyway?
11-13-2004, 02:09 PM
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Originally Posted by valpac
just wondering if this is how Mazda got those unobtainable 18-24 mpg numbers.
11-13-2004, 07:41 PM
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Originally Posted by sandia8
mazda says 10w-30 is fine for the rx-8
so why do 5w-30 or 5w-20
remember that 5w-30 would be worse than 5w-20 (bigger spread - longer molicular polymer chains )
so why do 5w-30 or 5w-20
remember that 5w-30 would be worse than 5w-20 (bigger spread - longer molicular polymer chains )
11-14-2004, 09:53 AM
#34
just wondering if this is how Mazda got those unobtainable 18-24 mpg numbers.
Here's a quote from
http://www.epa.gov/fueleconomy/420f04053.htm
How are Vehicles Tested?
Vehicles are driven over identical driving patterns by professional drivers in controlled laboratory conditions on a dynamometer, which is like a treadmill for cars. The conditions that occur during driving, such as wind drag and inertia are accounted for on the dynamometer. There are two types of tests that are conducted: city and highway tests.
The city test is approximately 11 miles long and simulates a stop and go trip with an average speed of about 20 miles per hour (mph). The trip lasts 31 minutes and has 23 stops. About 18 percent of the time is spent idling (as in waiting for traffic lights). A short freeway driving segment is included in the test. The engine is initially started after being parked overnight.
The highway simulates a 10 mile trip with an average speed of 48 mph. The vehicle is started "hot" and there is very little idling and no stops.
Vehicles are driven over identical driving patterns by professional drivers in controlled laboratory conditions on a dynamometer, which is like a treadmill for cars. The conditions that occur during driving, such as wind drag and inertia are accounted for on the dynamometer. There are two types of tests that are conducted: city and highway tests.
The city test is approximately 11 miles long and simulates a stop and go trip with an average speed of about 20 miles per hour (mph). The trip lasts 31 minutes and has 23 stops. About 18 percent of the time is spent idling (as in waiting for traffic lights). A short freeway driving segment is included in the test. The engine is initially started after being parked overnight.
The highway simulates a 10 mile trip with an average speed of 48 mph. The vehicle is started "hot" and there is very little idling and no stops.
11-14-2004, 10:20 AM
#35
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Originally Posted by Silver04RX8
I will stick with what the Owners manual say's. This seems to be an on-going debate, some say synthetic, some say follow the owners manual. Isnt there another thread somewhere dedicated to this whole subject?
As long as your synthetic oil is API SL 5W20, then your synthetic oil is perfectly compliant with all warranty requirements. "Follow your owners manual" and "synthetic" are NOT mutually exclusive. I use synthetic (Castrol Syntec).
PS - Brian Burrow (Mazdaspeed Motorsports) is very wrong - synthetics burn just fine - more cleanly than mineral oils, usually.
Regards,
Gordon
11-14-2004, 12:54 PM
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Originally Posted by crossbow
Have you ever seen how the MPG numbers are calculated? Here's a quote from
http://www.epa.gov/fueleconomy/420f04053.htm
http://www.epa.gov/fueleconomy/420f04053.htm
avg 48 on the hiway! gimme a f'in break.
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