I had used Syntec 5W-50 in all my engines ever since it came on the market. Then, last year, the stores around here stopped selling the 5W-50 so I went looking for a new product. I was impressed with the info I found on Amsoil and have since converted all my applications (Motor Oil, Hydraulic Fluid, Grease, & 2 Cycle Oil), to Amsoil! Using Amsoil 0W-30 is more energy efficient, but allows less wear than Syntec 5W-50! I still change oil and filter at 3,000 miles.
Compared to a car, a small air cooled engine, especially in lawn and garden equipment, works extremely hard in hot dusty conditions, and deserves the best oil I can buy!
I want the engine to get to maximum performance before I lock it in. A new tight engine will run hotter with less power than one that has had a chance to fully break in and loosen up! Most newer cars run best from 15,000 to 25,000 miles. My aim is to maintain that peak performance for as long as possible by switching to Amsoil at 20,000! On the PT-425 I estimate that that point would be 100 hours. (I was told that with the new GMC 6.6 Diesel, it should be run for 100,000 miles, then converted to Amsoil!!)
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