What oil for a Murray 4hp push mower??


Old 05-30-06, 09:44 AM
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Question What oil for a Murray 4hp push mower??

Asking as a complete mower novice! Mine needs oil and I want to be sure what kind to put in. Any help greatly appreciated.
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Old 05-30-06, 11:44 AM
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SAE 30. Preferrably a good quality name brand.
Old 05-30-06, 12:09 PM
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Thanks for the info. Do you know if it it makes any difference if it's 5W-30 or 10W-30?
Old 05-30-06, 01:28 PM
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Use a HD-30 weight (any GOOD! name brand like havoline, castrol, etc.) above 40 degree's F outside. multi wieght below 40, straight weights in cold temps will result in hard starting and possibly damage to the engine.

Using 5w-30 or 10w-30 multi weight conventional might result in more oil consumption. (these engines run very hot!, far hotter then a cars engine)

OR use a 5w-30 or 10w-30 SYNTHETIC all year round. cold or hot weather.... they are just that much better.

If you have to use a multi weight conventional. Most tend to use 15w-40. (its a 40 weight at operating temp) and this is fine and very resistent to the heat involved. This engine should take 20 ounces, not a whole quart now! there's a drain plug (insert a ratchet without the socket to remove it) and drain there, or out the dipstick tube. Be sure to check the oil level often!! and keep it at the full mark. To check it, get it on a level surface, pull the dipstick, wipe it off and put it back in and take it back out for a good reading.

Do not use ND-30 (non detergent) 30 weight.

AS for 5w-30 vs. 10w-30
they are both a 30 weight at operating temp, act like the first number (w stands for winter not weight) 5w-30 is good for a cars engine temp's..... in a air cooled engine, I've seen em use oil like crazy with 5w-30 (conventional now)..... since 10w-30 is a little more shear resistent (won't go out of grade so easy) right after switching to 10w-30 (same brand even) it used alot less. But you can feel safe and top up with any type of oil, just is better to keep it within the brand name thats in it for additive levels for that brand.

Btw, why do conventional multi weights shear so easy? lots of volume index improvers.... which synthetic contain naturally.... conventional straight weights have none but they can't be used in the cold weather.
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