Mootori läbipesuks on spetsiaalsed õlid ju. Minu mäletamist mööda ka Valvoline´il.

Beware of ZDDP boosters and concentrates being sold under various names. These products should truly only be used at time of break-in or not at all if a fully-formulated break-in oil is used. I haven't tested every one of these products, but one thing is very obvious to me. Every product previously sold to boost ZDDP, be it STP or EOS, always had roughly an equal amount of detergents to offset the affect of ZDDP in reducing the TBN of motor oil. Most of these ZDDP concentrates omit detergents altogether or use over-based Ca detergents known to reduce the efficiency of the anti-wear properties of the oil! Just like you need more Zn and P in an oil that has more detergents, you also have to have additional detergency because of the breakdown of ZDDP in peroxides and its interaction with combustion byproducts to form sulfuric acid. Knowing the right balance is something best left to the oil manufacturers and their chemical engineers. More acid, will increase the oils TAN, and will lead to corrosive wear of bearings. For once, I will have to say that more is not better, especially in this case. EOS and STP are decades old, and proven products that work synergistically with your existing motor oil and were never designed to boost the Zn and P more than 100-200ppm - unlike some recommendations to run double the ZDDP, in excess of 2000 ppm, which can lead to increased wear! It is not only the level of Zn and P that is important, but also starting with an oil that meets the ACEA A3/B3 standard would assure a starting TBN of 10 or higher and with similarly higher HTHS viscosities will also give you greater protection too. If you do choose to use these products, you must do used oil analysis to determine drain intervals and monitor overall TBN retention and ensure that the TAN increase does not lead to increased bearing wear! Too much ZDDP can also foul spark plugs and oxygen sensors, not to mention plug EGR valves and the catalytic converter. Additionally, lack of testing of these ZDDP boosters compared to fully formulated oils intended for racing or for older engines or even against SM or SN-rated oils side by side do not instill confidence in their performance, or at least at the time this was written.