We have a Chrysler(old 98 minivan), MB E320., and a Toyota. The E320 with 72K clacks too much at startup, using 0w-40, clacks about two minutes here in not so cold CA. The Chrysler 3.8 v6 with 3 times the mileage doesn't clack at all on any oil. The Toyota has solid lifters so has the same noise all the time. Your question is really good.
My point is "over engineering." On paper it looks good to have long long OCI's, and oils designed to match. But in real life use, is this working? I say not so much. The MB takes twice as much oil for a smaller engine than the Chrysler, then doubles the oil drain interval. How is that saving oil? It isn't.
Sticky lifters have been around a long time, what about Pennzoil products? They make a lot of cleansing claims, which I think is the root of the problem, sludge and varnish. In the old days I would put a qt. of Rislone in, do I dare on a non-iron MB cylinder wall? I am thinking of returning the M1 0w-40 I just bought for the MB. I may try the Total/Elf, it can be bought online pretty well. Trouble is, experimenting with 8.5 qt oil changes on a one year interval takes a little too long before I am too old to remember any of it.
My point is "over engineering." On paper it looks good to have long long OCI's, and oils designed to match. But in real life use, is this working? I say not so much. The MB takes twice as much oil for a smaller engine than the Chrysler, then doubles the oil drain interval. How is that saving oil? It isn't.
Sticky lifters have been around a long time, what about Pennzoil products? They make a lot of cleansing claims, which I think is the root of the problem, sludge and varnish. In the old days I would put a qt. of Rislone in, do I dare on a non-iron MB cylinder wall? I am thinking of returning the M1 0w-40 I just bought for the MB. I may try the Total/Elf, it can be bought online pretty well. Trouble is, experimenting with 8.5 qt oil changes on a one year interval takes a little too long before I am too old to remember any of it.