Royal Purple Oil Test: After a Season of Use - 03/24/2010

In June of last year we began a long term test of Royal Purple Synthetic motor oil in one of our PWC test engines. We started by changing out the oil filter and draining and replacing the oil in our test engine with a leading synthetic brand, rated SEA 10W-30. Our test was on a high performance Yamaha 1812cc four-stroke, four cylinder engine that was supercharged and rated at 210-hp. After warming up the engine we ran two complete sets of test numbers, then we changed out the oil filter and oil again, but this time with Royal Purple. We then let the engine go all season long.

Royal Purple
BoatTEST test engine: Yamaha 1812cc four-stroke, four cylinder supercharged engine.

Our test engine, a 2008 1812CC, four stroke four cylinder supercharged Yamaha marine engine installed in a FX Cruiser SHO Waverunner. When we changed the oil prior to testing with the leading synthetic brand, the engine had 76 hours on it. After the change, we let the engine run for another 30 minutes before we ran our test numbers. Since the engine was in a PWC on a trailer, with cooling water running through it, we knew that our test conditions would be controlled for each test. Our objective was to see if there was any difference in fuel flow between the leading synthetic brand of motor oil and Royal Purple. Here are the test results:

Royal Purple
The above results were the average of two sets of numbers run twenty minutes apart with the PWC on a trailer with the leading synthetic oil in the engine.

After the initial test, we drained and changed the oil and the oil filter, this time using Royal Purple Synthetic SEA 10W-30. We then used the Yamaha FX Cruiser SHO for the entire 2009 season in both salt and fresh water. This included long distance runs lasting three hours as well as lots of towing and multi-rider use.

After an entire season, adding more than 100 hours -- for a total of 179.1 hours on the engine -- we put it away for the winter. On March 20, 2010, on a beautiful 71 degree day we set up the test equipment again. After letting the engine warm up we ran the same test, with the engine on a trailer and cooling water running through the system. Here are the results. Not earth shattering, but definitely interesting.

Royal Purple
The results were the average of two sets of numbers run twenty minutes apart with the PWC on a trailer with Royal Purple in the engine.

Based on the claims made by the team at Royal Purple compared to our results, I think we can safely say that their product performed as advertised.

Now we have to admit, before performing the test we didn’t really know what to expect. What accounts for the improved fuel economy with the engine running on Royal Purple? Here's how the company answers that question--

Royal Purple’s advanced additive technologies, such as Synerlec, enable its products to outperform leading synthetic and conventional lubricants. These unique chemistries strengthen the base oil for improved performance. They also create an ionic bond that adheres to metal parts for continuous protection.

This is the second apples-to-apples test has conducted comparing Royal Purple to other motor oil. To see the test performed in the water in a cruising boat.

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