09-25-2014, 05:56 AM
Join Date: Sep 2014
Location: New Zealand
Engines are designed to run on a specific oil viscosity which is based on ambient air temperature, which means that thinner oils are designed for lower temperature operation and won't be thick enough to provide adequate lubrication at higher temperatures.
If you are in Alaska driving in the snow, then a 0W30 or a 5W10 would be fine, buit if you are in somewhere with 90 degree temps, then running anything less than a 5W30 would mean the oil would be too thin, resulting in less clearance between moving parts, less heat carrying capacity and more wear.
I seriously doubt changing oil viscosity from manufacturers recommended spec will improve economy, but feel free to prove me wrong. Its probably easier to tape an egg to the gas pedal and develop a "feather foot" to improve gas mileage.
2015 5 dr Grand Vitara 2.4 (daily driver)
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy
"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."