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under the mower deck you will see a drain plug under the engine.it may be a 7/16s or 1/2 inch wrench if you don't see that look for a hole that's shaped like a square i us a 3/8 drive ratchet with an extension to remove it..now rember before putting your hands under the mower always remove the spark plug wire to feel more comfortable remove the plug. may need changing anyhow along with the oil and check clean/replace the air cleaner while your at it.. hope this helps u

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12y ago
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Q: How do you change oil in my Murray 3.5HP mower?
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