Originally Posted By: B320i
Uh, go and check the whole of BITOG, then the rest of the internet before making that claim.
This is happening exactly as the thread suggests: New oil takes time to build a layer of additives. It doesn't just 'start working' the minute you start the engine. Engine oil isn't effective till it reaches close to full operating temperature. Industry experts posting on here have stated this time and time again.
In that time before the protecting film exists, more wear occurs. As I said though, over the life of the car it may not enough to be detrimental.
Talking about 30,000km intervals, you will find plenty of those in the trucking community regularly run such intervals, and so can anyone else running good oil and using their vehicle primarily on long trips. Again, using oil analysis is the only way you can be sure that isn't harmful to the engine.
If new additives in fresh oil need some time to be fully effective, isn't the protective layer of the previous oil still there to protect, and just replenished by new additives?..I still don't buy this theory, too many flaws in it.
Regarding truck engines - have you ever driven a truck? They use to run mostly long highway trips, sometimes between countries and continents. A truck can make 10 000kms in one week, noone would change the oil weekly, because no neeed for it, oil just won't be stressed enough. For a truck 1500rpm is the upper zone or revolutions, they use to run at about 500rpm, no spirited driving there, no stop and go city driving, oil in this case doesn't see much punishment. No comparison possible between the oil in a sporty driven, dailydriver often revved up to 7000rpm and more and the one in a truck used mostly for long trips in ridiculously low rpm range.
