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I have two Westinghouse branded 2500 watt (peak) air cooled inverter generators I use to power my RV. The oil chart provided by the manufacturer recommends 10W-30 for below 80F ambient and 15W-40 for above 80F ambient. The manual also states that synthetic oils are acceptable and I prefer to use...

Lots of great reading here. I am now doing the oil changes on our 2017 Subaru Outback 2.5Ltr. I live in central Oklahoma with trips to Colorado from time to time. No off roading, no towing and a mix of town and highway driving. I run Top Tier fuel from Shell, Phillips 66, Valero, Conoco...