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Take this for what it's worth but Motor Week's Master Mechanic, Pat Goss, stressed for years that using a weight of oil NOT recommended by the manufacturer is a huge mistake. He said the manufacturer spends millions of dollars ascertaining the best weight of oil for that specific engine and they know what's best. In addition, he claims that cars using 5W-20 oil have a smaller path to travel through so that's one of the primary reason they use a thinner weight oil. Finally, in the case of a car that comes with a recommendation for 5W-20, you do NOT get better protection with a thicker weight oil such as 5W-30. Please feel free to research Pat Goss and read exactly what he wrote because I'm summarizing articles he wrote a few years ago. Obviously I don't remember exactly what he said word for word but I think the above is fairly accurate.Report it
For those who are interested I have done the perceived impossible (as far as other posts go). At 7100 miles on the ODO my last tank of gas at 9.1 gallons of regular allowed me 367.5 miles of daily commute/local errands over 6 days. To save you the trouble of doing the math that works out to 40.38 miles per gallon. I want to stress that this was NOT straight highway driving. My summer commute is mixed driving. I did not cause any accidents nor did I ever get honked at. I drove normally for me but I will admit the weather conditions were perfect. Like I stated in my review the computer mpg average overestimated me at 43.9 as it always does. I think I can actually achieve a little bit more. I had a case and half of leftover oil from my Versa. I was using 5W30 (Mobil 1 synthetic). Rio manual says to use 5W20 which is thinner and also a "claim" for better mileage. Since I still have leftever 5W30 I used that for my first Rio oil change. I'm going to switch back to 5W20 synthetic on the next to see if there is any bump in mileage. The moral of the story is EPA window sticker can be achieved on a daily commute in this car (with real math, NOT the computer).Report it
I found the comments from Pat Goss. By the way, most oil damage is in the first 10 seconds after starting so you want oil to circulate as rapidly as possible. Hence, a thinner oil is better. Pat Goss said, " Thicker oil does not give better protection. Thicker oil is simply harder to push through an engine. Thicker oils are also slower to circulate through an engine both at start-up and while driving. This is critical because the radiator in a car contributes about 60% of the total cooling ability"Report it
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