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A reader asks: My car is now tuned for 94 octane gas. My local stations only provide a premium gas at 91 octane. Can I use AMSOIL Octane Boost to bring the 91 octane gas up to 94? Our answer: We would not recommend attempting to use an octane boost to bring 91-octane gasoline up…
Updated- April, 2026 AMSOIL has overhauled the popular Preferred Customer (PC) program. The updated program now offers more “money back” rewards and improved incentives. The main changes are related to the rewards program. These changes take effect on November 1, 2021. Complete details will be found in the Preferred Customer welcome package or at the…
A reader asks: My car is supposed to use 5W-20 motor oil. I accidentally bought 0W-20 and did an oil change without noticing. Is it safe to continue running the 0W-20? Our answer: In most cases, 0W-20 is a perfectly acceptable substitute for 5W-20. Both products are 20-weight motor oils at operating temperatures. However, the…
A reader asks: I am looking for a bit of advice on an oil bypass filter system. What is the difference between the AMSOIL BMK22-EA Dual Gard Bypass System and BMK30 Heavy-Duty Bypass System? This is for a highway tractor pulling super B’s. This unit would probably be logging about 95,000 miles (150,000 km) per…
A reader asks: I have to spend $4000 on a CVT transmission rebuild for my Nissan Rogue. I still owe $6000 on this car. The mechanic says the transmission failure happened because I never changed the fluid. How often should you change oil in a CVT transmission? Our answer: CVT Fluid should be changed a…
A reader asks: A shop did some work on my Harley-Davidson and filled my primary with synthetic oil. I have always used regular H-D oil. Can I drain it and replace with regular oil? Will this cause any problems? Our answer: You can safely drain the synthetic oil and go back to conventional oil (but…
A common question is whether synthetic ATF can be used in classic cars? Yes, synthetic automatic transmission fluid is certainly compatible with older transmissions. It can provide a nice performance and protection upgrade. Synthetic ATF will have similar viscosity and frictional properties to conventional ATF. Make sure to purchase an ATF meeting the correct specification…
If you are looking for an automatic transmission fluid for that classic car or truck, finding the correct ATF product may be confusing. Modern ATF labels likely do not list ATF specifications that have been obsolete for decades. But we can help. We carry a selection of ATF products that meet most all vintage ATF…
A reader asks: Is it OK to use AMSOIL Dominator 2-Stroke Racing Oil in my Johnson 15-horsepower outboard engine? Our answer: No, AMSOIL Dominator would not be an appropriate choice for your outboard engine. AMSOIL has a few outstanding options for your outboard motors (see below). Dominator is a great oil for racing, but not…
AMSOIL has added a new 15W-50 Synthetic Small Engine Oil. The new AMSOIL Synthetic 15W-50 Small Engine Oil joins 5W-30, 10W-30 and 10W-40 in their Small Engine Series. Some engine brands such as Kohler, Vanguard and Kawasaki suggest using a 15W-50 motor oil in some models. Where Can This Small Engine 15W-50 Be Used? This…
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