Close inspection of all internal gearcase components was performed prior to and after testing to observe any potential gear wear.

Initial impressions of the Alisyn ProGear 21 Type 1 oil were that it’s thin – very thin. Could this thin oil provide just as much gear protection as traditional heavy-weight oils? We were on a mission to find out if Alisyn ProGear 21 Type 1 lived up to its claims.

With the 2.5 litre  SportMaster flushed and filled with Alisyn ProGear 21 Type 1, driver Helmut Freitag had no problem achieving a best GPS-recorded top speed of 123.9 MPH. All speeds were consistently recorded in the 124-MPH range, indicating an instant gain of approximately 2 MPH – from an oil change. Additional extended runs were performed totaling several hours of high speed use and loading on the gearcase with no problems.  Testing on the 3-litre SportMaster revealed a gain of .8 MPH and 50 RPM, which is impressive when one considers this is a heavier boating running at much less RPM than the 2.5-litre application.  Also noted were increases in acceleration - a difference that became immediately apparent from the start of our testing. 

Our prior concerns regarding the possibility that such thin oil would seep past the seals and enter the case were unfounded, as no evidence of any water intrusion was present. Although Alisyn ProGear 21 Type 1 is blended from a highly specialized additive formula, it is compatible with most seals, O-rings, and gaskets including plastic, elastomeric, and rubber.  Also worth noting that ProGear is available in a variety of viscosities, all offering Alisyn's superior protection additives.

Test Results - STV/Mercury 2.5 EFI

We tested ProGear 21 in the 2.5 and 3-litre version of Mercury's Sportmaster gearcase.

After testing, Molnar completed a full disassembly of the 2.5-litre gearcase and evaluated all internal components for added wear. We’re pleased to report that Alisyn ProGear 21 Type 1 provided full protection, with no visible or measurable signs of added wear.

In addition to ProGear's impressive performance, we're also pleased with ProPower 21 two-stroke oil.  As we know, nothing tests an oil's integrity more than extreme high-RPM use over extended periods of time, and ProPower provided clean-burning protection.  Removal of the cylinder heads for inspection as well as leakdown tests confirmed that there was no oil-related wear that occurred during our evaluation.  We'll be using ProPower and ProGear lubricants for more extensive, long term tests with a follow-up report, but from our current findings, we're confident that Alisyn's products provide excellent high-RPM protection and performance.

ProGear 21 Type 1 lives up to its claims of providing protection against accelerated wear in high performance applications.

For those of you looking to extract maximum performance from your performance boat, this product should be on your upgrade list – and unlike most modifications that will provide the potential for 50-200 RPM increases, this isn’t nearly as expensive.  Results in this test are based our our testing, using Mercury SportMaster gearcases.   Are our results of this evaluation representative of how your particular boat will benefit from using Alisyn ProGear 21?   Possibly, but it's always best have a professional technician inspect your engine's components to evaluate their condition and suitability for your application.  That said, our evaluation does prove an undeniable fact – this product lives up to its claims by freeing up power while providing full gearbox and engine component protection.