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why do shops use 20w50 as the oil weight of choice? 200

posted by  vvpete on  Tue Dec 7 11:14 CST 2004
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last visit: Thu Jul 10 14:10 CST 2014
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Certainly a topic for discussion, where many opinions flare.
In general, I would agree with the comments presented here for using 15W-40 for hot/summer and 10w-30 for winter, EXCEPT for the addition of the engine type. This is the rule for later B230F low friction engines. If we're talking about the older B21F, and even older B20F, I would recommend 20W-50 for those engines for hot/summer, and 10W-40 for winter. Having had 140's with high rpm performance in my shed for years, I used 20W-50 all year and even ran well in -10 deg on VT ski trips.
Taking it a bit farther, the later LH 2.4 FI seems to behave well with lower viscosity, like 10W-30 dino oil and 5W-30 syn. The temp/fuel compensation for choke and even running can be less than adequate even in hot climates like Dallas where I live. They are close tolerance engines, and if in good shape, will be better with low viscosity oils all year.
--
'89 245 Sportwagon, '04 V70 2.5T Sportwagon






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