I changed 2 years ago with my whole fleet on Liqui Moly. Why ?: First, I make my living in this country and will continue to do so and sometimes get my pension from here, too. Therefore I make a conscious effort, who produced some where. Unless there is the choice and the quality permits. And that's the case with LM. Furthermore, just this TOPTEC 4100 the ideal oil for all modern cars with or without turbo. I drive it well on my older vehicles (14y.o.) with large engine that consumes little oil until today. I think from experience nothing of Longlife oils, not because of 0W30 etc. via piston rings always minimal fuel comes into the oil circuit. I will not drive 30.000km and risking engine damage. Therefore, I move all classic 15.000km oil. Since this LM looks TT4100 still pretty good and is half as expensive as Longlifeöl.0Wxx I will not because it is too thin, when the still is then diluted with gasoline ??? D rather not. that's me 5Wxx prefer. and xW30 because there is no lubricant film stability at higher temperatures. Very well read in the Oil brochure directly from LiquiMoly. xW40 is as safe. Another advantage of this LM TT4100 is the specification against Castrol a notch API: SM (Castrol Magnatec 5W40 SL only). Therefore strong buy recommendation from me.
