Motorcraft 15w-40

[ProfPS]

Local Walmart has this on clearance for $2.32 (CI-4, SL) and my mower is due for an oil change. I have only used Rotella SAE 30 in the past (SAE 30 per owners manual) but I cannot find it in qt bottles, only gallon jugs. What is your take on running MC 15w40 in a push lawn mower with 6.75 hp B&S in NC? Typical use is 1 hr once a week.

Thx.

 

[pickled]

It will be perfectly fine. I ran delo 15w40 in mine before I switched it to amsoil ASE. Your power might drop ever so slightly over a 30 grade. Have fun!

 

[Steve S]

It will allow the engine to last as long as it is going to last.

 

[ProfPS]

Just put the MC 15w40 in today and when I was priming the oil pump by gently pulling on the pull-start cord, it started up without having to press the fuel primer. Engine ran smooth. Let's see how it runs on its weekly Wednesday cutting.

 

[pickled]

It will shear down quick to a 30 grade, but it will definitely get you through til after the winter season. HDEO's are good to run every once in a while in a small splash lubricated gasser because they clean the engine really well. It's true that they do offer a bit more parasitic drag and also don't dissipate heat as quickly as a 30 grade synthetic, but it's a 6.5 hp briggs!