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 and others swear by BRP XPS Semi-Syn Oil? What is the correct AMSOIL engine oil recommendation?

AMSOIL 10W-40 Formula 4-Stroke® Marine Synthetic Motor Oil

AMSOIL 10W-40 Marine is a superb choice for Sea-Doo supercharged 4-TEC engines.

Answer: As you have the supercharged Rotax 4-TEC engine, using the proper motor oil is vital. AMSOIL 10W-40 Formula 4-Stroke Marine Synthetic Motor Oil covers all of the bases in terms of protection and performance for your engine and may very well be the best choice on the market.

The first consideration for your engine is that the motor oil is compatible with the slip-clutch on your supercharger. Regular motor oil for gasoline-powered cars and trucks contains friction modifiers which can cause excessive supercharger slippage. AMSOIL Marine 10W-40 does not contain friction modifiers and it possesses the ideal frictional properties for consistent supercharger performance. The synthetic makeup of this product also fights extreme heat, so the service life of supercharger slip washers and bearings is optimized.

While the Sea-Doo owners using Shell Rotella diesel oil may have cheap oil, AMSOIL 10W-40 Formula 4-Stroke Marine Synthetic Motor Oil not only offers 100% synthetic performance, it also delivers an anti-rust and corrosion package that is designed to protect marine engines both in-season and during storage. This measure of protection alone is well-worth the upgrade to AMSOIL Marine 10W-40. AMSOIL products have always performed well versus BRP XPS Oils, so we can confidently suggest that AMSOIL Marine 10W-40 will be a solid upgrade over the partial-synthetic XPS Summer Grade 4-Stroke Oil.

For Sea-Doo owners of Rotax 4-Tec models from 2004 to 2007 that still have ceramic slip washers on their superchargers, AMSOIL 10W-40 Formula 4-Stroke Marine Synthetic Motor Oil is 100% compatible with this material and will not weaken these washers. There was a myth out there ten years ago suggesting that synthetic oil could damage these ceramic washers, but AMSOIL performed extensive testing to debunk this theory.

Most Sea-Doo owners of 2004-07 models have upgraded their supercharger’s ceramic slip-clutch washers to metal (or should be considering this upgrade service). Regardless of whether your model has ceramic or steel supercharger washers, AMSOIL Marine 10W-40 will be perfect for your Sea-Doo 4-TEC engine.

We can offer AMSOIL 10W-40 Formula 4-Stroke Marine Synthetic Motor Oil at the lowest price in Canada or the United States. Contact us for a wholesale price list using the form on this page or call us at 1-800-748-5781.