Quote:
Originally Posted by Capt. Roll
5W/20 is recommended by some manufacturers due to a better Fuel Economy Rating. My owners manual recommends the 5W/20 for better fuel economy (thinner oils provide less resistance) and better cold weather performance. I live in Texas, rarely does our temperature get below 0 degree F. Due to our temperatures being warmer most of the year, I will be using Mobil 1 10W/30 in my engine........the viscosity recommendation shown in my owners manual.
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I agree. Right now I'm using 5w-30 but may go to 10w-30 permanently. Unless you're consistently close to 0 degrees F, you don't even need a 5w.
Building oil pressure quickly at cold start is more important then flow. Even 10w oil flows to -33 F. Oil pressure is the critical issue on cold start. 0w and 5w oils provide a low oil pressure scenario until the oil thickens. 10w and 15w build oil pressure much faster.
