Lubegard 30901 Bio/Tech Engine Oil Protectant, 15 oz.

Great

I have been a user of Lubegard Red transmission additive for many years, so I decided to try the Bio/Tech Engine Oil Protectant for the first time.I added it to the engine in my wife's 2011 Toyota Sienna when I did a recent oil change at 100k miles. This van has the 3.5L 2GR-FE V6, and I've done 10k mile oil changes using 0w-20 full synthetic since new. The engine has always been reliable and uses no oil between changes.About 1,000 miles after this oil change my wife pulled into the driveway and I see a long trail of motor oil being left on the pavement behind her. I check the oil and there is nothing showing on the dipstick. My wife claimed that the oil pressure warning light never came on and that the engine sounded normal.I crawled underneath and determined that a rubber hose between the engine and the oil cooler had developed a pinhole leak which had coated the entire undercarriage with motor oil. I had the van towed to a Toyota dealer and they said that this is a fairly common problem with the 2GR-FE of that era, and that Toyota had updated the part with steel hard lines. This hose repair was completely covered by an extended warranty on that part with no cost to me.The best part is that the engine seems to have survived the oil leak unscathed. I don't know how much motor oil was still left in the engine, but there was a lot of it on the ground. The engine runs and sounds exactly the same as before. Now I can't say for sure that using the Lubegard additive prevented a tragedy in this case, but I do believe that it helped to keep the engine protected during this oil loss problem. I will continue using this Lubegard product in all of my engines from now on for the peace of mind that it brings.Update 05/01/23: I just did the 130k mile oil change on this van and the engine is still running great! Of course, I put in the Lubegard Bio/Tech additive like always. It is a great product and I now use it in all of my engines. I've found that it is cheapest on Amazon in the 32-ounce size and have been buying that recently.Update 08/12/24: The Sienna recently had another oil change at 150k miles and everything is still just fine. The engine runs smoothly and uses no oil between 10k changes. I'm continuing to use the Bio/Tech even though the price has increased (like everything else). By doing my own oil changes I save enough to offset spending more for such a great product.

I'm a huge fan of science and NOT a fan of virtually every other oil additive being sold today (excluding Liqui-Moly products). I choose to use top-quality synthetic engine oils (Pennzoil Platinum, PP High Mileage, and Pennz Ultra Platinum being my favorites) and I want to plainly state that there is virtually nothing that can be added to these oils that has not already been carefully included by the engineers at Pennzoil (SOPUS). However, this Lubeguard with synthetic LXE tech, is the "virtually"...the true exception.Synthetic wax esters are a specific type of wax ester that has a natural affinity for metal, on the molecular level. It literally binds itself to the surface of metal inside your engine, forming a boundary layer of lubrication that does not run off. However, the layer of molecules is so thin, that it will not interfere with any kind of engine mechanism...even the most finicky of oil-pressure-driven variable valve timing systems...unlike most other additives which hold solid particles in suspension (like PTFE, etc.). Many manufacturer-provided esoteric synthetic engine oils (like Nissan, for their GTR), use this exact same technology to provide cold-start (and high-heat/hard use) lubrication to the turbos and intricate valvetrains of the twin turbo V6 in the newest-generation GTR. But that oil is over $13 PER QUART.The Lubeguard additive provides a real scientific, tangible benefit to your engine: this self-bonding synthetic liquid wax ester fluid.So, what does this mean? It means your roller rockers and everything in your valvetrain remain lubricated no matter how cold it is and no matter how long the car has sat un-used (I have a 2011 outback that gets used once per week and this, alone, is an enormous benefit). It means the inherent Extreme Pressure qualities that the wax ester film has is going to reduce cylinder wall scuffing, cam lobe wear, etc.The biggest benefit I've seen is during cold starts...the engine doesn't rev as high, drops to std idle speed much sooner, the engine is far quieter, and there is no valve noise. Seeing that around 90% of engine wear occurs within 60 seconds of startup over the lifetime of an engine (i.e. before the oil has had a chance to be pumped around the engine), this product offers an enormous, tangible benefit.Other wear reduction benefits aside (and reduced wear ALL the time is indeed a true benefit), the cold start benefits are just huge. And I noticed a significantly better startup on an 85 degree Florida day in my 3.6 H6 engine that already has a Fram Ultra filter and Pennzoil Platinum....it already ran like a sewing machine. I cannot imagine the improvement in temps below 50 degrees F.With Amazon's permission, a primer on LXE synthetic wax ester technology, its benefits, and its origins from the Lubeguard website (all lubeguard products are available HERE on Amazon for less than virtually anywhere else):[...]

Seems to quiet down some of my older out of warranty vehicles during start-up. What I don’t understand is how the price went from $23.07 in Dec of 2023 to $41.59. Are you kidding me? I will discontinue use at this price point.