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A reader asks: Do you offer a dual bypass filter kit for the Ram Cummins 6.7L engine? I would like to move the stock oil filter and have the bypass filter in the same location. Our answer: AMSOIL offers only a single remote bypass oil filter system for the Ram/Cummins 6.7L engine. The universal AMSOIL…
A reader asks: I am looking for a two-stroke injector oil that is the same quality as the Evinrude XD50 Synthetic Blend 2-Cycle Oil. Is AMSOIL HP Marine the closest match? I’ve got an older outboard, but still looking for a decent injector oil. Our answer: A fairer comparison would be AMSOIL HP Marine to…
Updated February 18, 2026 AMSOIL Now Offers A 75W-85 API GL-5 Gear Oil If your owner’s manual specifies 75W-85 API GL-5 gear oil, you’ve likely discovered two things: it is difficult to find at local auto parts stores, and the dealership price for a single quart can be eye-watering. This leads to the most common…
Update: May, 2024 A reader asks: A lot of motorcycle owners use Shell Rotella T6 diesel oil in their engines/transmissions. Is there any downside to using diesel motor oil in motorcycles? As Shell Rotella can be found fairly cheap, why would I want to use the more expensive AMSOIL Motorcycle Oils? Our Answer: Diesel motor…
New AMSOIL Diesel All-In-One Fuel Additive is one of those products that one could argue doesn’t cost, it actually pays. This multi-faceted diesel fuel additive is a must for any diesel owner looking to maintain performance, fuel economy and engine life. Here are the top five reasons why using Diesel All-In-One is a great idea….
Can running the latest synthetic 2-stroke oils cause problems in older outboards, snowmobiles, dirt bikes or lawn/garden engines? A reader asks: I’ve got a 1995 25-horse Johnson outboard engine. Can a newer synthetic 2-stroke oil like HP Marine be used? Is there any risk that it will plug the carb or cause gelling? Our answer: There…
A reader asks: I own a Nissan Skyline GTR with the twin turbo RB26 engine. The previous owner used 0W-40 motor oil. I’ve read online that 0W-40 might be too thin. Is 10W-40 a better option? I will not be winter driving it at all, but might occasionally start it up during the nicer winter…
Updated- September 2025 A reader asks: I own a Mazda RX-8 rotary sports car. At present, some of the engine oil is injected directly into the combustion chamber to lubricate the apex, corner and side seals. This plays havoc with the engine exhaust emissions. What I want to do is to mount a separate tank…
AMSOIL is offering free shipping on orders over $100 for Preferred Customers starting on Wednesday, June 14th at 9 am CST and ending on June 20th at 11:59 CST. Who Is Eligible For Free Shipping? AMSOIL Preferred Customers with valid memberships in Canada and the United States. Customers in remote regions may not be eligible…
A reader asks: Why does AMSOIL Dirt Bike 10W-40 have the JASO MA rating and not the JASO MA2 rating like the AMSOIL Metric Motorcycle 10W-40? How important is this? Our answer: Before we get into the finer details of JASO MA versus JASO MA2, let’s talk about the real-world difference between AMSOIL Dirt Bike 10W-40 (JASO…
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