Well, since it's protecting your engine I would go with the thinnest stuff possible. Really. Most damage to most cars is at start-up. So, 5-30 for normal or 0-?? if synth. For hard use, go with what ever won't cause your oil pressure guage to go nuts. Racers like thick stuff, but then again start-up isn't what they are worrying about. Those of us with older cars need it to keep the pressure up. If you are tracking 20-50. If not, I wouldn't go higher than 10-40.
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