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15W40. I'm told the current gasser oils aren't as good for old engines due to the reduced level of a zinc containing additive called ZDDP. Apparently accelerated camshaft wear can result from using the new oils in old cars. Diesel oils are supposed to be better. I ran Rotella 15W40 in my '71 250. The engine ended up going bad, but not in a way that was related to oil in any way. I also ran 15W40 Rotella in my '86 Lincoln Town Car and '88 Suzuki Samurai with good results.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.
83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
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01-18-2014, 10:56 PM
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