I'm currently using castrol edge 0w40, however delo is pretty cheap, frequently goes on sale around here, and I dump my oil once a month at 4-5k so no chance of it staying in the sump into the fall or winter. Any reason delo would be a bad idea? My engine does not seem to care what viscosity I dump on it, if anything it runs better with less racket on the 0w40 and I still get 30-35mpg mixed.
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