Search results

i once drove juniors bmw 523i (M52B25 engine) to the dealer for some reason, i believe to get some trim part. they said the engine sounded weird. then they filled in 6 liters of oil. i was pissed, because it was expensive. no idea how long the engine has been driven like that, but probably for...

"Are newer oil formulations and their additive packages actually better at protecting an engine from wear, or are they mainly driven by manufacturer requirements based on emissions and the sort? " i think you would have to look at what is tested and how. 1. is there an good overview somewhere...

sorry, should have been "rating". i think everybody should stop chasing technology that is 80 years old and has successfully been replaced for at least 20 years. we should not start looking for high levels of phosphorus, sulfur and zink because the editors of "hot rod magazine" found out zddp...

edit: there are acidic, neutral and basic zddp's.

what doesnt get mentioned a lot is that the high zddp levels in "classic" oils were due to the neccessity of mitigating the presence of lead scavengers (like ethylene dibromide) that are long gone. zddp is a large family of compounds. it surely matters which one is used (e.g. aryl v.s. alkyl...

this is from an older thread by caterham: "We also know that viscosity change with temperature has lost the parabolic effect that occurs at low temp's and from 100C to 150C and higher, viscosity change with temperature is virtually linear." could you (or somebody else) expand on the "linear"...