OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions on Other Engines Can you use 15w oil ?

As you see from the chart that multi grades allow low temp operations as the oil is thin at these temps. If operating during your Summer season then 15w40 would be fine for those engine with oil pumps and SAE30 for the oil slinger version. As note regular multi grade oils then to burn off quicker in warm weather. Now your synthetics does this at a much less of a rate.

Here something that happen here last summer on a rebuilt engine that a customer was using in 100+F temps. Within one month the came back without oil and the engine was destroyed because they insisted on SAE10w30 oil and never checked the oil level.