Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have a 30kw water cooled $#%*mins onan standby generator.The manual recommends 10w30'or 5w30.the company that installed it said they use 15w40.I asked them why and he said that the engine has an engine block heater and 10w30 was too thin for year round use.My question is ....would 15w40 be too heavy of an oil for use in the winter?Or is it ok since the engine has a block heater?

5w30 synthetic is what all my OPE gets generators everything and my stuff seems fine whether its -25 or 90° so but that is what works for me!!!!!