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A heavyweight battle between three perennial motor oil favorites. AMSOIL, Royal Purple and Mobil 1 have been long considered to be top-end motor oil brands. A recent independent, standardized lab test was conducted to determine how well each brand could combat deposit formation. Here are the contenders. About The Test The TEOST 33C test (also…
A reader asks: Do you have an SAE 50 heavy duty Diesel Engine Oil for trucks that meets the API CF-2 specification? Our answer: We do not have a “straight” SAE 50 diesel engine oil. But we do have a heavy-duty 20W-50 that would be ideal for any application requiring SAE 50. AMSOIL SAE 20W-50…
A reader asks: Do you carry an ATF that meets the DEXRON HP spec? I’m having trouble finding a transmission fluid that meets that specification. Our answer: Yes we sure do. AMSOIL Signature Series Fuel Efficient Synthetic ATF is a high-quality upgrade over AC Delco DEXRON HP. This product also covers the DEXRON VI spec….
Updated- April, 2024 A reader asks: I have a 2008 Dodge Ram 2500 with the G56 six-speed manual transmission. My truck is fairly stock. I’m looking to replace the ATF fluid in the transmission with gear oil. Mercedes builds these transmissions and recommends MobilTrans SHC DC SAE 50 transmission oil in Europe. This product is…
AMSOIL recently released this promotional video for their synthetic ATV oils. It features a testimonial by 6-time GNCC ATV champion Chris Borich. The Grand National Cross Country (GNCC) series is one of the world’s most prestigious off-road racing series. Held in various locations throughout the Eastern United States, GNCC races are 2-hour marathons that feature…
A reader asks: I am looking for some input on outboard 2-stroke oil selection. Having reviewed all the product literature from AMSOIL, it seems that I have three choices, but I cannot determine which is best suited from my motor. My engine is a Mercury Outboard 90 hp, and my choices seem to be: (i)…
A repair shop that rebuilds and warrants automotive differentials asks about the capabilities of oil analysis. A reader asks: Can oil analysis can pick out whether friction modifier additive has been added to gear oil in automotive differentials? We occasionally handle warranty claims on limited slip differential repair work. The biggest question is always whether…
Let’s compare some of the key performance attributes of Shell Rotella T6 Synthetic 5W-40 Engine Oil and AMSOIL Premium Diesel Synthetic 5W-40 Engine Oil. As we mentioned in a recent post, Chrysler has just changed the engine oil recommendation for their EcoDiesel engine in some Ram 1500 and Jeep Grand Cherokee models. Their previous suggestion…
Update March 2024: EcoDiesel engines have been required to use variations of 5W-40 engine oil since 2016. This applies all the way back to the original 2014 model. The article below discusses the switch from 5W-30 to 5W-40 engine oil that took place in 2016. See our application guide to find the correct motor oil…
Updated- January 2025 A reader asks: Do you have a replacement for Evinrude/Johnson HPF Pro High Performance Gearcase Lubricant? The label doesn’t show the viscosity of the product, so I’m not sure what to use. Our answer: Yes we have a direct alternative for Evinrude HPF Gearcase Oil. AMSOIL Synthetic 75W-90 Marine Gear Lube is…
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