I have the Generac GP-1500E generator with the GTH/GTV 990 Engine. The engine manual and owners manual state not to use 10-40W oil or diesel oil.
I see many on the forum recommend using Rotella T5 15-40 or T6 5-40.
What would make the 30HP GTH/GTV 990 Engine different that Generac would say not to use the above mentioned oil?
Copied from the engine manual:
Recommended oil type:
Using the proper type and weight of oil in the crankcase
is extremely important. Check the oil before each use and
change the oil regularly (see Figures 1-1 through 1-5). Failure
to use the correct oil, or using dirty oil, can cause premature
engine wear and failure.
Use only high quality detergent oil rated with an API service
classification SJ or higher (example: SL or SM). Do NOT use oil
designated "for diesel engines only" (example: CD).
The recommended oil weights include the following:
• During summer months: SAE 30. An acceptable substitute
is SAE 10W-30. After first oil change, synthetic oil is
acceptable.
• During winter months: SAE 5W-30 or synthetic 5W-30. DO
NOT USE SAE 10W-40. After first oil change, synthetic oil
is acceptable.
I see many on the forum recommend using Rotella T5 15-40 or T6 5-40.
What would make the 30HP GTH/GTV 990 Engine different that Generac would say not to use the above mentioned oil?
Copied from the engine manual:
Recommended oil type:
Using the proper type and weight of oil in the crankcase
is extremely important. Check the oil before each use and
change the oil regularly (see Figures 1-1 through 1-5). Failure
to use the correct oil, or using dirty oil, can cause premature
engine wear and failure.
Use only high quality detergent oil rated with an API service
classification SJ or higher (example: SL or SM). Do NOT use oil
designated "for diesel engines only" (example: CD).
The recommended oil weights include the following:
• During summer months: SAE 30. An acceptable substitute
is SAE 10W-30. After first oil change, synthetic oil is
acceptable.
• During winter months: SAE 5W-30 or synthetic 5W-30. DO
NOT USE SAE 10W-40. After first oil change, synthetic oil
is acceptable.