Mobile 1 5-30.
A 5-40 seams like way to broad of a range. I recall some manufacturers specifically reccomending against 10-40 due to it's wide viscosity, and I would think 5-40 would be even worse.
Assuming you drive about 6K or more a year, it should not be that big a deal to change weights in the middle of the spring/fall or as needed per season.
I would stick to manufacuteres reccomended weights.
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I am a Commodore PET --- Now get off my lawn you kids...
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