Oil for Onan Generator

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I have a 1992 Fleetwood Motorhome with a 4500 watt Onan generator. I need to change the oil and am looking for a recommendation. Specifically, is todays SM oils with reduced antiwear additives sufficient, or should I use a HD oil.
 
Shell Rotella-T 5w-40 would be an excellent choice for cold winter or hot summer usage.

Joel
 
Formula 4-Stroke® 10W-30/SAE 30
Synthetic Small Engine Oil (ASE)
A commercial grade formulation designed for hot temperature, severe service operation of small engines where routine maintenance is often difficult or infrequent. Recommended for use wherever SAE 10W-30 or SAE 30 oil is specified in gasoline or diesel engines, transmissions, hydraulics, and chain cases requiring the listed specifications. Applications include maintenance equipment, tractors, lawn and garden equipment, generators, compactors, pumps, light towers, welders, log splitters, power washers, cement mixers and trowels, skid-steers, excavators and compressors.
 
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