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As Paul said, don't let the 0-30 fool you ( fighter jet engines use stuff lighter than this ), this is some serious stuff.
I run it year round in my '90 wagon and I used to run it year round in a 3/4 ton service van that did a lot of heavy pulling ( in Arkansas ) before I sold it.
I also know people who run it year round in large motorhomes.
The only times I have found the heavier oils nessicary is in older air cooled big twin motorcycles, older engines with high bearing clearances, and old worn engines like my '84 240 diesel that I switched over at about 223,000 miles and am running on 20-50 ( which is actually the recommended weight for this engine anyway.
----------Robert
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