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Updated- March 2024 A reader asks: I have just changed oil in my car and I’m now going away for five months. The car will be in storage for that time. Do I need to change the oil again after the five-month storage period? The oil used was AMSOIL Signature Series 5W-20. Our answer: No,…
AMSOIL has reformulated their XL Synthetic Motor Oil Series in anticipation of the upcoming ILSAC GF-6 industry specification. The result is long service life, better cleaning power and improved resistance to extreme heat. XL Motor Oil is available in 0W-20, 5W-20, 5W-30, 10W-30 and 10W-40. Here are the top five highlights of the new rendition…
AMSOIL has reformulated their flagship Signature Series Synthetic Oils and the company is quite excited with the results. AMSOIL is touting Signature Series as the undisputed world’s best motor oil. What Is Signature Series? Signature Series is AMSOIL’s most advanced line of synthetic motor oils for automotive applications with gasoline engines. Signature Series is available…
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…
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