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AussieJeffProbst t1_jcyaxdp wrote

Might be worth a call but honestly I'd be really shocked if they weren't selling everyone in residential grade 2.

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interweb_gangsta OP t1_jcybvej wrote

What conclusion can I derive from the grade of the oil? I assume one is lesser quality. How would I know which oil is right for my system? Been using Eastern for awhile and this is a new issue. Could be that my tank got contaminated with water or something.

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AussieJeffProbst t1_jcyi34w wrote

Water in the tank is more likely than shoddy oil imo. You want grade 2 for residential. Grade 1 is cheaper but burns less efficiently and makes more waste.

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