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Synthetic oil or not that's the ?


LawnSite Member
I was wondering if anyone had any good or bad experiences with synthetic oils or wonder oil treatments(Prolong,slick 50,ect.) One of my machines has a kohler, so I need all the help I can get.... J/K.


LawnSite Platinum Member
Central Florida
The only downside to synthetic is it's cost. Otherwise it is superior to petroleum. I use Mobil 1 in my Kohler 25 and Kubota as well as my vehicles.

As far as additives go, I am not a big fan of them. If you use a quality synthetic they are not necessary. Stay away from Slick 50 and anything with PTFE's. It was never intended for use in and engine.

Eric ELM

Husband, Father, Friend, Angel
Chicago, IL USA
I have read that using anything with PTFE isn't good, but I've been using it for over 10 years now with no internal engine problems. I use Tufoil which has particles smaller than 1/2 a micron in size. My Amsoil 1 micron oil filter doesn't clog up using this, so the size must be correct. It will make any engine run cooler, which I feel is a great thing for air cooled engines. I didn't know how much it made them run cooler, but when I put it in my new diesel, the temperature dropped 10 degrees on a 90 plus degree day, so I could see a big difference there. This is very slick and less friction means less heat. I also use it in my truck and van. Even after reading about this on this forum before, I continue to use it and add it to a new engine after it is broke in. I notice more power and better mileage on road vehicles. If anyone wants to read about this product, this is the site. http://www.tufoil.com I'm not saying you all should use it, but I will continue to use it since I've had such good luck with it. None of my engines need oil added between oil changes, so it can't be all bad and some are 10 years old. I think it all depends on the size of the PTFE particles, but that is just my opinion.


LawnSite Member
My work truck never leaves town. Just a lot of short trips. I was wondering if I would have a moisture problem after leaving synthetic oil in for so long compared to changing conventional every month or two. I put additives in my Katana 1100 and it increased my top speed from 146mph to 150+mph. But that was when I was young and foolish.
I used amsoil for years but now use Havoline full syn. it's
$3 a quart at Advance Auto.

With my truck and car I change the oil and filter every two years. Thats about 15k+/- miles per vehicle.

The mowers get new oil and filters once a year in late November no matter how many hours run. During mowing season it is add only.


LawnSite Fanatic
Here we go again!!


LawnSite Senior Member
Northwest Ohio
Bought a used Walker in June and after running it for a few weeks I switched all the fluids over to Mobil 1. After running Mobil 1 in the engine,hydros,and the gear boxes everything seems to run much cooler than they did with regular motor oil. I'll stick with the Mobil 1.
Good Luck,


Synthetic oils are a viable economic option only if you use the extended drain intervals that these oils allow. If you're running synthetics, with the increased cost, WHY stick with the normal change interval? Granted, synthetics will provide better wear charastics, but they are designed to provide those over the entire extended drain interval. I change yearly, in the fall, as part of my winterization process.


LawnSite Gold Member
stanfield nc
Isaw a very convinsing demo that involved
a drill press,havoline 10-30 and militeck.
It definitly reduced friction a lot.
Iuse it on motors ,bearings etc .
It is most effective in extending life
of old worn things.