John Deere S100

I did the John Deere S100 oil change and filter shortly after purchasing on March 2023. I did not save the hours when I changed it but the oil in the report was added soon after I got the lawn mower. The engine had 83 hours when I drained it.

AMSOIL states the 100% Synthetic Small-Engine Oil service life of up to 200 hours or one year. Based on that and this report I will probably let it go 100 hours, regardless of age, which will probably be three years. Check the dip stick level occasionally and oil level was always the same.

The report is using AMSOIL 5W-30 100% Synthetic Small-Engine Oil and a EA15K53-EA oil filter. S100 oil capacity 1.5 qt.

Replaced with AMSOIL 10W‑30 small‑engine oil and a AMSOIL Oil Filter EA15K53-EA. 5w or 10w is fine, but 10w is recommended.

I also add AMSOIL Quickshot® Gasoline Treatment and Stabilizer with regular 10% ethanol gas. The maintenance dose is (gallons X 0.66 fl. oz). The clean-up dose is double. I add the clean-up dose at start of the season directly in the 2.4 gallon gas tank which is 4 oz or 1/2 cup measure of Quickshot, slight overdose is fine. For the rest of the season I use the maintenance dose added to the 2.5 gallon gas can at 2 oz or 1/4 cup measure of Quickshot.