Can I use 0-30 in place of 5-20

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14,842
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Illinois
No problem, but there is no evidence that I see that 20 wt oils provide less protection than 30-40 wt oils in engines calling for 20wt. 20 wt oils have been called for in the US for a good 15 years in various makes of engines from different engine builders. Another thick vs thin thread.
 
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