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Tag Archive for: mercruiser

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Which Oil And Filter For Mercury MerCruiser 8.2L H.0. MAG Engine?

AMSOIL Product Applications, Tech Discussion

A reader asks: I’ve got twin 2013 Mercury MerCruiser 8.2L H.0. MAG inboard engines in my boat. This engine does not show up in the AMSOIL application guide. Can you recommend an AMSOIL motor oil and oil filter for this engine?

Our answer: While it’s true that MerCruiser engines are not included in the “Marine” section of AMSOIL’s online application guide (for some reason), we can provide a couple of motor oil options as well as an oil filter recommendation for your 8.2L H.O. MAG engines.

Engine Oil Options

AMSOIL Synthetic-Blend 25W-40 Marine OilThe first option we would suggest is AMSOIL’s brand new Synthetic-Blend 25W-40 Marine Oil. This motor oil was engineered specifically for Mercury/MerCruiser motors. Marine engines are routinely put under tremendous strain and this new 25W-40 is designed to provide consistent and long-lasting wear protection. This AMSOIL 25W-40 is a cost-effective upgrade for Mercury Synthetic-Blend SAE 25W-40 Marine Engine Oil.

If you would prefer a 100% synthetic option, have a look at AMSOIL 10W-40 4-Stroke Marine Synthetic Motor Oil. This 10W-40 is a highly suitable replacement for any 25W-40 marine oil. It offers all of the wear control, shear stability and extreme heat resistance required for your MerCruiser engines in a high-tech, full-synthetic package. If you want a full-synthetic oil over a semi-syn for your engine, this is your best bet.

Does AMSOIL Offer A Full-Synthetic 25W-40?

AMSOIL offers only the synthetic-blend 25W-40. Mercury markets only a semi-synthetic 25W-40 for their engines, so AMSOIL wanted to provide a product that was easily recognized as a Mercury alternative. There is absolutely no technical reason to use only a synthetic blend in these engines. We’re quite sure that Mercury did this to keep motor oil input costs down. Prior to the release of this new AMSOIL semi-synthetic 25W-40, AMSOIL suggested the 100% synthetic 10W-40 4-Stroke Marine Synthetic Motor Oil for all Mercury applications requiring 25W-40 motor oil. The 10W-40 is an outstanding shear-stable option, but as Mercury owners were looking for 25W-40 and were unsure about a 10W-40 (despite the fact that it is an outstanding substitute), AMSOIL created the new 25W-40.

The bottom line is that either option is perfectly fine. Have a look at our pricing and choose from there.

Oil Filter For MerCruiser 8.2L H.O. Engine

The oil filter that is compatible with your Mercruiser 8.2L H.O. engines is the AMSOIL EAO-59. The AMSOIL EAO oil filter line is robust, durable and among the most efficient on the market. AMSOIL EAO Oil Filters are built with superb components making them a great match for your MerCruisers.

We can provide oil and filters at wholesale prices for your Mercruiser engine in both Canada and the United States. Contact us for pricing information using the form on this page of call us at 1-800-748-5781. 

June 18, 2016/by Marc Roden

Correct Oil For Mercruiser 5.7L Flat Tappet Cam Engine?

Tech Discussion

A reader asks: I’ve got a 1988 10 meter prowler with twin inboard Mercruiser 5.7L engines that produce 260 horsepower each. As these engines have flat tappet cams, what would be your engine oil recommendation?

Our Answer: GM produced 5.7L (350 c.i.) engines with flat tappet cams for Mercury up until 1995. Making a proper motor oil choice for these engines is crucial. Flat tappet camshafts require high ZDDP (zinc dialkyl dithiophosphates) levels. Both zinc and phosphorus are anti-wear additives that have been reduced in the latest motor oil standards. The reason being is that high concentrations of these additives can cause problems in present-day emissions components.

A common rule of thumb for zinc levels of motor oils for flat tappet cam engines is a starting point of about 1200 ppm and up. If a motor oil’s zinc level is not in this neighborhood, do not consider it. Motor oils for gasoline service up to the API “SL” specification (for cars made 2004 and earlier) could be considered. Motor oils with the API SM or SN specifications and newer should definitely be out of the running as the zinc and phosphorus content may be insufficient.

Diesel engines oil with API CI-4 or CI-4+ specification were designed for engines made prior to the 2007 model year. These oils tend to have higher zinc and phosphorus volumes. Provided that the zinc levels are determined to be in the ballpark, diesel oils with these specs can be great candidates for gasoline-powered Mercruiser engines with flat tappets cams. Avoid diesel oils with the newer API CJ-4 specification. CJ-4 diesel oils have lower zinc and phosphorus levels.

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor OilOur Oil Recommendation For Mercruiser 5.7L Engines With Flat Tappet Cams

We sell an oil that we believe is perfect for these engines. AMSOIL 15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil contains 1377 ppm zinc and 1267 ppm phosphorous. This makes it a potent force against flat tappet cam wear. This API CI-4+ Synthetic 15W-40 has a powerful detergent package, extended service capabilities and an anti-corrosion package for marine conditions. For older inboard engines, we believe that this is an ideal engine oil.

September 30, 2015/by Marc Roden

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