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Accidentally put 10W40 instead of 10W30 in Kohler Command Pro 23 ??

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31K views 14 replies 13 participants last post by  roughnites  
#1 ·
I changed my oil today and mistakenly used Mobil 1 10W40 instead of 10W30. Should I change it out again ? My machine is a 2003 Exmark horizontal crank with 400 Hrs homeowner use. I put about 50 hrs a year on it and change the oil every spring. Appreciate any comments.

XB 2002
 
H
#4 ·
And that is only one of the big reasons why I run the SAME type and weight of oil in EVERY engine of mine, in my case that happens to be 5w-30 synthetic, that's what I run, every engine (well except hydraulic oil and chainsaw oil and 3-in-1 and wd-40 and I have some cooking oil in the kitchen as well).

But...
So long you have all the same oil in the crankcase you should be fine except it may be your only Kohler that has 10w-40 so you have to remember that and what runs in every other machine... I probably would just run it, hope and remember.
 
R
#6 ·
tundraman said:
Actually the 10w 40 is probably better
Click to expand...
This! 50 hours is a reasonable change interval for a splash lubricated engine. If your engine is pressure lubricated (has an oil filter), then changing your oil once a year if you're using synthetic is probably a waste.

I use M1 10w40 High Mileage in all my small engines. It's some of the best oil you can get. The HM formulation has more zinc, which is better for the engine BTW.
 
D
#7 ·
herler said:
And that is only one of the big reasons why I run the SAME type and weight of oil in EVERY engine of mine, in my case that happens to be 5w-30 synthetic, that's what I run, every engine (well except hydraulic oil and chainsaw oil and 3-in-1 and wd-40 and I have some cooking oil in the kitchen as well).

But...
So long you have all the same oil in the crankcase you should be fine except it may be your only Kohler that has 10w-40 so you have to remember that and what runs in every other machine... I probably would just run it, hope and remember.
Click to expand...
Many words, little information.
 
A
#8 ·
Apologize if this is info you already know (others may not), the first number (10) is the oil weight at cold start temp, and the second number (30, 40 etc.) is the oil weight at running engine temp. I can't see a real issue between running 10W30 or 10W40. I have a spread sheet on my computer were a put all of the info for each of my small and large engine regarding the oil type and amount, spark plug types, hours changed, etc. For each engine that has an oil filter, I take a Sharpie and write the hours, oil type and amount on the oil filter. This way, at a quick glance of the filter and hour meter, I can tell if the oil needs to be changed, and what type and amount I'll need. :usflag: Happy mowing!
 
X
#11 ·
appalachianoutdoors said:
Apologize if this is info you already know (others may not), the first number (10) is the oil weight at cold start temp, and the second number (30, 40 etc.) is the oil weight at running engine temp. I can't see a real issue between running 10W30 or 10W40. I have a spread sheet on my computer were a put all of the info for each of my small and large engine regarding the oil type and amount, spark plug types, hours changed, etc. For each engine that has an oil filter, I take a Sharpie and write the hours, oil type and amount on the oil filter. This way, at a quick glance of the filter and hour meter, I can tell if the oil needs to be changed, and what type and amount I'll need. :usflag: Happy mowing!
Click to expand...
Smart guy I was gonna give the same info regarding the numbers in oil types
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J
#12 ·
I run kawi 10w40 utv cj-4 oil in my diesel cummins rv, onan generator, exmark ecv980, walk behinds, log Splitter, and absolutely no problems. Oil looks BARELY used after manufacture reccomended intervals. It's blended by motul which is some Good azz oil. And it's free! I acquire around 50-60 qts a year from services that have leftover oil. Just upped my generator to 200 hr OCI because the Blackstone said the oil had lots of life yet being changed at 150 hrs. 10w40 oil in a vtwin is better because oil temps in the summer can get as high as 260 degrees.
Posted via Mobile Device
 
T
#13 ·
I run Rotella T6 5w40 in everything but the wife's nissan. It shows good resistance to shear, has high amount zddp that helps with the cams in the small emgines, has great resistance to heat and it's widely available and reasonably priced.

Running a 10w40 is no problem, probably gonna do you some good.
 
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#14 ·
appalachianoutdoors said:
Apologize if this is info you already know (others may not), the first number (10) is the oil weight at cold start temp, and the second number (30, 40 etc.) is the oil weight at running engine temp. I can't see a real issue between running 10W30 or 10W40. I have a spread sheet on my computer were a put all of the info for each of my small and large engine regarding the oil type and amount, spark plug types, hours changed, etc. For each engine that has an oil filter, I take a Sharpie and write the hours, oil type and amount on the oil filter. This way, at a quick glance of the filter and hour meter, I can tell if the oil needs to be changed, and what type and amount I'll need. :usflag: Happy mowing!
Click to expand...
Simple yet absolutely brilliant. I'm def. going to be doing this with my engines. Thanks for the advice good sir.
 
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