BestLine 853796001429 Premium Synthetic Diesel Engine Treatment - 16 oz.

I never rate anything at 5 stars unless it has proven to be absolutely worth it. I have tried all the known market leading brands in the last 25 years, then finally!.... Comes along an engine oil additive that actually works! Yes I repeat and stand by my statement, an engine oil additive that actually works unlike all the others!.... My engine oil light had a broken bulb and I didn't see that my oil was low and for three days when I started my engine it made a shearing noise when I turned on the ignition, which went away after about 20 seconds. So I thought it was the fuel regulator as when you start my model of car the fuel rail regulator can make a noise. Little did I know I was running out of oil and the pistons were rubbing metal to metal! I gave it a thrash on the highway and stopped for a while at a DHL depot to collect a parcel. When I went to the car and started it and got on the road again the engine kept wanting to quit. I managed to limp into a garage and when I got out of the car the cylinders were making the loudest squealing noise I have ever heard! It died and seized in seconds. But no engine oil warning light was working,.... the bulb had blown! I left it to cool and filled it to the full mark. and managed to start it. I limped home and must have used most of the oil to get there. Smoke was billowing out of the exhaust and I thought the old girl was dead. I showed it to my mechanic the next day and he said he thought it was a gonner, but I didn't give up yet. I ordered BestLine from Amazon and it arrived quickly. I put it in the engine and it smoothed out significantly. It is now running sweeter and smoother than it ever did as the parts have been polished by the BestLine! I Highly recommend this product to anyone, if you have a slightly worn engine you want to keep for a long time, Save fuel and forget about astronomical repair bills this is the one to go for look nowhere else! Like I said in the beginning, ((IT WORKS!!))......A month on. WARNING! I ordered the same Item BestLine 853796001429 Premium Synthetic Diesel Engine Treatment - 16 oz again, and was sent ((BestLine premium synthetic HD instead!)) It is thinner and not fit for purpose! The reason why I ordered it in the first place was because I have a piston that has a worn or seized piston ring! And my order has been changed by the seller. BUYERS BEWARE! They cannot be relied on to send the item you paid for! I am not happy one bit and will make sure they pay dearly for their switch. BestLine premium synthetic HD isn't even sold on Amazon, you cant find it anywhere here! Update... three weeks on, I contacted BestLine admin directly. I was contacted promptly by Jane of their customer service team who was very apologetic and explained they sent their superior industrial high pressure lubricant sent me a replacement + a bottle of their diesel fuel treatment for my trouble. I am pleased with their customer service, I highly recommend this product.

I used this product (Just 1 bottle, not 20%) in my 335D BMW Sedan and I noticed my vehicle would glide further and took longer to naturally stop after easing up on the diesel pedal. I absolutely felt a huge reduction in engine friction. My vehicle used to feel as if the engine was using molasses (Felt Stickly) and after one application, I felt a difference after about one drive of about 5 miles. It seems to be an amazing product and Im confident enough to order more for my next oil change. Products like these always let me down, badly... but Best Line help up to their claims.

great product, when i add to engine the engine run smoothly and a remarkable diffenrence in the noise level

I tryed the gas one , so i got this for diesel i have. So this review is on my gas car . I expect the same for the diesel .Out of all the magic ,oil additives , that claim 20 % this, better that ,more power , increased mpg . This one actually seems , i know i know, well it does seem to work .! I am as shocked as every one reading this . My motor feels smoother , and get this, quieter ? No little ticking noises , idle os better . I run a supercharged motor making over 550 hp . I worry about damaging it because it is under a lot of stress compared with a non boosted motor . It was a big gamble trying this . My oil pressure is a little better which means it helps keep viscosity up and less break down affter hard runs . No i don't feel more power , i would need a back to back , oil with and with out best line to see that on a dyno. But am cautiously pleased .i just added a little to my snow blower at recommended amout for kicks . I will be ordering more . Really give it a try , i never recommend stuff . i think it maybe a product that does things other than take our money .

Have covered 150 miles since adding BestLine synthetic diesel oil treatment to my 2008 Alfa Romeo 159 JTDM with 115,000 miles on the clock, was a little apprehensive about claims made by the company and the fact that I could not find a dealer in the UK, purchased from US via Amazon, not cheap (with postage).Results so far, impressive, engine much quieter, oil much cleaner, runs silky smooth, seems more responsive, very quiet when starting from cold, don't know about fuel consumption because I'm inclined to use the car as Alfa intended !!!!!I know it's early days but I will use at every oil change.

I have a 2003 F250 with a 7.3 and it would lope on start and ejectors are clacking, changed engine and HPOP oil added this product and smoothed out. The real selling point on this was the reviews and test on youtube

I ordered the engine oil treatment but got the fuel treatment instead. I was about to pour it in my oil when I noticed it was for the fuel.

purchased Bestline for three different vehicles. I have used one in my 2010 Mercedes R350 Too soon to make proper evaluation of product.