Wynn's 76864 350ml Hydraulic Valve Lifter Treatment

Wynns are very good company and I use their products when I need to, this time however this treatment didn't helped and even made things worse. I use it in Mitsubishi Lancer that I had a little noise from the lifters on cold start for which I suspected a dirty lifters as the oil was a bit darker despite only driven 4000 miles. After I use the treatment and drove the car for around 500 miles I noticed that the oil has lost its viscosity, engine has become noisier and lifters tick has become louder. So just changed the oil with exactly same grade of 5w40 and all good now. Conclusion: lifter treatment might help to clean dirty and sticky lifters and dilute the oil to make it flow easier but be carful with the viscosity, don't leave in the engine till next oil change, and for treatment of less than a 4 litres of oil use only half of the bottle. It's like kind of a engine flush that you can drive with it for a few days than new oil need it for a best results and to be on the safe side.

This product really does work and ive used this before on another vehicle, there is a difference with sticking lifters and a knackered camshaft, lifters will clatter for a while, usually on start up and persist for up to a mile, a work camshaft is a perminant clatter regardless of when started or miles travelled, this product does do it's job if you have some patience, you should notice the difference after approx 50 miles and total silence after 200, ive found it best to change the engine oil when the cars engine is clatter free as you know all the gunk that is blocking the small oil channels are clear, a good italian tune up can prevent the system clogging as stop start traffic does engines no favors at all.

Had a noisy tappet on startup and for first few minutes of warmup. (90s Astra with the 1.4 8v petrol engine). When hot you could also hear it ticking occasionally. During the first couple of days of using the Wynns it improved, and after a couple of weeks except for an occasional short rattle on startup, the engine is now quiet. Hopefully this will improve in time. It doesn't mention in the instructions whether you can leave it in the engine until the next oil change, so I presume it must be fine.

I have a 19 year old Mazda MX5 which I have owned for the last 16 years. It has always had a slightly "tappety" sounding engine at idle. Read some of the reviews and thought this was worth a try for £5.85. Put it in the oil and at first it didn't seem to make any difference. But the next time I started up the car the noise was gone. Highly recommended!

The treatment was delivered late, and was NOT in the advertised bottle, so I had to carefully dispose of the excess additive - a waste, and inconvenient as the tin could not be re-sealed. So far, no difference at all to my engine.