Is Diesel Engine Oil OK For Motorcycles Engines and Transmissions?

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…

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Top Five Reasons To Use AMSOIL Diesel All-In-One Fuel Additive

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….

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Can Modern Synthetic 2-Stroke Oil Be Used In Older Engines?

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…

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Nissan Skyline GTR Motor Oil Options: 10W-40 Or 0W-40?

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…

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Which 2-Stroke Oil For Mazda RX-8 Rotary Engine?

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…

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AMSOIL Dirt Bike And Metric Motorcycle Oil- JASO MA vs. JASO MA2

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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When To Switch To Synthetic Oil In Harley-Davidson Milwaukee-Eight Engine?

A reader asks: I have a 2017 Harley-Davidson Street Glide Special with the new 107 Milwaukee-Eight engine. When is it safe to switch to AMSOIL synthetic oil in this engine? How often should I change the oil after the break-in period? Our answer: Harley-Davidson suggests changing the oil in Milwaukee-Eight engine after the first 1000…

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Motor Oil Or A Specific Hydrostatic Transmission Fluid In Zero-Turn Mower?

Many mower manufacturers will allow the use of 20W-50 motor oil in their transmissions. While motor oil will work in many hydrostatic transmissions, there is a better option. There’s no question that motor oil will capably work in mower hydrostatic transmissions. The mower will steer and it will be propelled forward and backward. But there are vital…

Snowmobile Synthetic 2-Stroke Oil Cold Flow Test: AMSOIL vs. Ski-Doo, Polaris And Arctic Cat

The video below shows how quickly Ski-Doo XPS 2-Stroke Fully Synthetic Oil, Polaris VES Synthetic 2-Cycle Snowmobile Oil, Arctic Cat CTEC2 Synthetic 2-Cycle Oil and AMSOIL Interceptor Synthetic 2-Stroke Oil flow when cooled down to -40°F. Video- AMSOIL Interceptor Cold Flow Test Let’s compare the cold flow capabilities of the three main OEM synthetic 2-stroke oils…

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Oil And Filter Options For Kawasaki Mule Pro DXT Diesel UTV?

A reader asks: I’ve got a 2016 Kawasaki Mule Pro DXT UTV (with the 993 cc diesel engine). I’m having trouble sourcing an oil filter. Do you sell engine oil and oil filters for this model? I would also like to change the front diff and transmission oil. If you have any product suggestions, that…