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There are only 2 additives that I believe in. One is Chevron Techron fuel injector cleaner, which I add every couple of oil changes and see MPG increases a tankful later. The other is Redline water wetter for the cooling system, which keeps the water pump as well "lubed" as a water pump can be, and it also seems to keep engine temps a little lower. I would suggest using a really good synthetic oil by itself in your engine, transmission, and rear axle. Only Amsoil, Quaker State, Pennzoil, and Vavoline, plus a few others are truly "synthetic". Mobil 1 & Castrol Syntec use Group III hydrocracked base stock (utra-refined mineral oil) in their "synthetic" oil, which is good stuff, but not truly synthetic. Do a search on synthetic oil here and you'll see a lot of great information.
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Thanks,
Dave
1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)
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