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Considering oil grade switch.. need help
I have been running 10w30 in my car for the past 3 years. I have heard switching to a lighter weight such as the 5w20 may boost FE. My main concern is if my engine can handle it or not. It's a 2.0 mazda 4 cyl with close to 136k miles, always used conventional oil. I considered switching to synthetic as well but I have heard horror stories about loosening sludge and killing the engine. What do you guys think? Thanks in advance.
Roger
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1998 Mazda 626 DX
2.0 4 cylinder
5 speed manual
AC and PS Delete
17x7 Drag DR 19 wheels ( I know )
Hankook z rated tires ( again, I know
Future plans: Mazda miata 14'' BBS wheels 
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