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
Find a drain plug or turn it on it side and dump the oil out.
Car oil
A 17.5 horsepower Murray riding lawnmower should always have 1.5 quarts of oil in it. You may have to add more than that after an oil change because some of the oil will go down into the oil filter.
30 hd oil
10w30 will do.
30W for summer
1/2 quart
SAE 30W
youtube - push mower oil change.... oil plug under mower deck
30 sae
SAE 10w30 weight. I highly recommend you use synthetic oil in any air cooled engine and change it once each year.
Straight 30 weight