If you want something really thick to stand hot weather and hard driving go for 10W60. It will give you easy starts in cold weather (10W) and still be thick at operating temperature (60). Watch your oil pressure, if it drops below 2 bar at idle get thicker oil. If pressure stays above 2 bar all the time with 10W40 or 0W40 or 5W50 or 15W50 or that ever viscosity you use currently there is no reason to use thicker oil.
//Magnus
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944 N/A '83
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