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Updated- September, 2024 A reader asks: I have a 2012 Sea-Doo RXP-X 260 with the 1493cc supercharged/intercooled 4-TEC engine. I know some Sea-Doo owners use Shell Rotella 10W-40 diesel oil. Others swear by BRP XPS Semi-Syn Oil? What is the correct AMSOIL engine oil recommendation? Answer: As you have the supercharged Rotax 4-TEC engine, using…
A reader asks: I’ve got a 2003 Sea-Doo Sportster LE Jet Boat with the “947” 951cc Rotax 2-stroke engine. What would be the correct AMSOIL 2-stroke oil for this engine? If this helps, here is an excerpt from my owner’s manual: Caution: Do not use NMMA TC-W, TCW-2 or TCW-3 or other ashless type two-stroke…
Of all of the auto manufacturers, Volkswagen (and sister company Audi) seem to be the most stringent about motor oil specifications. VW started issuing their own motor oil standards over 25 years ago. This was done to ensure that their cars would perform well and last as long as possible. These specifications have evolved along…
BMW issues clearly defined motor oil specifications for their vehicles. These motor oil standards exist to ensure proper engine protection and to satisfy factory warranty requirements. Let’s explore what each of these specifications means. We’ll also point out which AMSOIL Synthetic European Formula Engine Oils applies to each BMW spec. BMW LL-04 BMW-LL-04 was devised…
Find the proper European motor oil alternate for products from over 30 brands. Updated: September 2025. This cross-reference guide suggests an AMSOIL motor oil substitute for most European formula engine oils sold in the United States and Canada. European car brands such as Volkswagen, Mercedes-Benz, BMW and Audi require the use of different motor oils…
Can you mix two different motor oil viscosity types to make your own custom viscosity? Is it OK to mix two motor oils of the same viscosity type? What about mixing different brands of engine oil or mixing conventional and synthetic oil? Can you mix motor oils for gasoline and diesel engines? Let’s talk about…
Update- May, 2024 A reader asks: I use 5W-30 motor oil in my Infinti G35 during the winter and my owner’s manual suggests that it is suitable to use 10W-30 in warmer temperatures. Is there any real benefit to switching to 10W-30 in the summer and back to 5W-30 in the fall? Answer: There is…
Our customer Bill M. recently installed an AMSOIL Oil By-Pass Oil Filter System on the 5.9L Cummins engine of his 2003 Dodge 2500. Bill did a great job on this project, so we thought we’d post his photos and share some of the details of his installation. Hooking up an oil by-pass filter system on…
A reader asks: I’ve heard that AMSOIL Dominator 2-Stroke Oil can cause internal engine rust. Is there any truth to this? Answer: This 100% not true. We have also seen internet chatter suggesting that Dominator Synthetic 2-Stroke Racing Oil causes rust on engine internals like cranks, piston and cylinder walls or at least leaves these…
A question from a reader: “Do you offer a motor oil for my 1976 Triumph TR-6?” Answer: For most classic cars such as your TR-6, the AMSOIL Z-ROD motor oil series is the logical choice. First let’s discuss why a motor oil meeting the very latest industry specifications might not be the best choice for…
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