High Zinc motor oil in mower

H

Homeport

Joined
Oct 28, 2025
Messages
3
I have several gallons of high zinc Valvoline oil left over from my old British cars that I sold. Would it be safe to use in my JD Gator and Ariens mower since they don’t have catalytic converters? Both have Kawasaki engines.
 
Homeport said:
I have several gallons of high zinc Valvoline oil left over from my old British cars that I sold. Would it be safe to use in my JD Gator and Ariens mower since they don’t have catalytic converters? Both have Kawasaki engines.
Click to expand...
Use it and report back, there are other things besides oil that you should look at. JMO
 
Some of these prior threads may be helpful:

T

Thread 'high zddp in small engine oil?'

I thought zddp isn't needed in outdoor power equipment? Like you can use sn rated oils with no issues, yet I go to a place like tractor supply that sells ope oils and it's all older SJ and SL rated oils? I mean the bottles don't have the api donut, but they're still claiming it's SL rated or SJ rated depending on which one you get. I got a few quarts of toro brand 10w30 oil and it said it was SL
P

Thread 'How important is ZDDP in small engines?'

What levels of Phos and Zinc do you look for in a snowblower/lawnmower/generator engine?

Is 700-1000 ppm ok?

A stouter 1000-1200 ok?

Or something like 1200+?

Assume the oil to be a GRP IV PAO for the sake of arguement.
J

Thread 'ZDDP in Lawn mower oil'

This is my first post so don’t beat me up too bad. I have a Jeep Cherokee with a 4.0 inline 6 engine that has a flat tappet cam. I am trying to find an oil to use in it that has a high amount of ZDDP. What I want to know is how much ZDDP is in Kohler 10W30 Universal Motor oil and also how much ZDDP is in Briggs and Stratton 30W lawn mower oil?


Thanks
B

Thread 'Valvoline VR1 Synthetic Racing oil (black bottle)'

I read some info on this oil and liked that it has a high zinc content for added anti-wear protection. So i called Valvoline and spoke to a rep there to ask if this oil is safe to use in my two small lawnmower engines (Honda 160cc and Kawasaki twin cylinder FR651V.) As of today, the Honda has the 10W30 while the Kawasaki has the 20W50. I ran both for a few minutes to get the oil circulated. I have read differing opinions about using this oil in non-racing or high performnance engines---some even saying the oil will turn "sludgy" and/or actually do harm. Any expertise is surely appreciated.
C

Thread 'How important is zinc in the flathead B&S engine?'

I have two B&S flathead engines, one 6ish HP on a push mower(splash lube), the other 19ish HP on a JD rider(pressure lube). I commonly use new leftover oil from auto and ATV oil changes in my OPE. I have enough oil to change the mowers and refill it with low-SAPS oil that is left over from my TDI diesels. The low-SAPS oil isn't real "healthy" in zinc, or any other additive really. Though not ideal, would the oil hold up reasonably well for my engines that see max 50 hour OCIs?
D

Thread 'Fully Synthetic with high levels of zinc?'

I know this post should prob be in the lawn mower section,but I'm wonder if the people in this section have more knowledge regarding this.
I know royal purple offers the hps oil that's high in zinc,but are there any others that are available,and cost less than the $10 royal puple qt bottles?
N

Thread 'Is it worth adding ZDDP in OPE engines?'

Is it worth adding ZDDP additive to small engines used on snowblowers, mowers etc?
 
Homeport said:
I have several gallons of high zinc Valvoline oil left over from my old British cars that I sold. Would it be safe to use in my JD Gator and Ariens mower since they don’t have catalytic converters? Both have Kawasaki engines.
Click to expand...
I've been running VR1 in my Honda lawnmower and Pressure Washer for years. Friend at advance had two cases of it that weren't moving or something and they were going to just throw it away. Seems to work fine in them!
 
I do need to jump in here, because we get these so-called Threads about high Zinc Oil in Mowers, I am a high zinc guy. I will stick with my high Zinc Issue, but there are more important things:

1) Check the oil before mowing
2) Blow the Mower off after each use
3) Use Top Tier Gasoline
4) Use a tad of Redline Fuel System Cleaner once a year
5) Use either MMO or tcw-3 as a fuel additive to keep the Carburetor doing great

You can forget about Number 3, 4, and 5, that is your choice, but do not forget about Number 1 and 2!
Let's jump on Number 2 and why this is so important, if you have an air-cooled engine it does not matter what oil you are using if the Cooling Fins get clogged up.
Let me go on another tangent, this has nothing to do with Zinc, if you mow your yard with temps above 90 Degrees Fahrenheit, use either 5W-40 or 10W-40, do not even use 10W-30. The 10W-40 will hold up as well as a 15W-40.
Let's get more technical, you can get a thermal probe thermometer and check your lawnmowers oil temp after you are done mowing, anything below 250F a 40 Weight oil is fine, anything higher a 50 Weight oil is better.
Another tangent, my mower has the engine in front, but if you have rear mounted engine, like a Zero Turn Mower, you need a 50 Weight oil, rear engine mounted mowers run hotter.

I am using HPL CK-4 10W-40 in my Kohler 7000 series engine and it seems to be better with oil temps and no oil consumption versus Shell Rotella 10W-30
 
Brian123 said:
I do need to jump in here, because we get these so-called Threads about high Zinc Oil in Mowers, I am a high zinc guy. I will stick with my high Zinc Issue, but there are more important things:

1) Check the oil before mowing
2) Blow the Mower off after each use
3) Use Top Tier Gasoline
4) Use a tad of Redline Fuel System Cleaner once a year
5) Use either MMO or tcw-3 as a fuel additive to keep the Carburetor doing great

You can forget about Number 3, 4, and 5, that is your choice, but do not forget about Number 1 and 2!
Let's jump on Number 2 and why this is so important, if you have an air-cooled engine it does not matter what oil you are using if the Cooling Fins get clogged up.
Let me go on another tangent, this has nothing to do with Zinc, if you mow your yard with temps above 90 Degrees Fahrenheit, use either 5W-40 or 10W-40, do not even use 10W-30. The 10W-40 will hold up as well as a 15W-40.
Let's get more technical, you can get a thermal probe thermometer and check your lawnmowers oil temp after you are done mowing, anything below 250F a 40 Weight oil is fine, anything higher a 50 Weight oil is better.
Another tangent, my mower has the engine in front, but if you have rear mounted engine, like a Zero Turn Mower, you need a 50 Weight oil, rear engine mounted mowers run hotter.

I am using HPL CK-4 10W-40 in my Kohler 7000 series engine and it seems to be better with oil temps and no oil consumption versus Shell Rotella 10W-30
Click to expand...
Thanks for advice. I only use alcohol free fuel in my mowers. Using redline in my Saab cars and Toyota truck will now include mowers.
 
Use it with confidence in those small engines. Long life in small engines comes from oil levels being OK, oil changes regularly and air filter maintenance. Air filter maintenance is more overlooked than oil changes and important as most OPE and SxS lives in a dusty environment.
 
Small engines are so forgiving. Changing the oil at the proper intervals is much more important than the oil you use. There's no need to add anything to the oil.
 
Lubener said:
Small engines are so forgiving. Changing the oil at the proper intervals is much more important than the oil you use. There's no need to add anything to the oil.
Click to expand...
Yep, my Kohler will be 3 years old in January - and it’s seen 4 different oils in 6 changes - Currently Mobil 1 Extended Performance 10w30.
 
I believe that Kawasaki uses an iron cylinder sleeve, which is good for long life, but many yard equipment engines run the piston right on the aluminum engine case. And maybe I'm wrong, but it seems to me that a goodly shot of ZDDP for such engines is a good thing to reduce wear. If I had VR1 I'd gladly use it. I've got a bottle of Delvac Extreme 10W-30 I'm using.
 
I've got a Kohler Command on a commercial walk behind mower that has about a million hours using, I'm sure, the cheapest automotive 10w-30 available. They don't need anything special except for clean-ish oil and air filters as was mentioned.

Still starts on the first or second pull.
 
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