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1973.5 Oil Changes and Filters

Engine

Vehicle Information: Model: 1973.5 911 T targa; Year: 1973; Body Type: Targa; Engine (type, size, modifications): 2.4 liter; Total Mileage: 1400 on rebuild;

I have about 1400 miles on a rebuild. The car is driven one or two days a week; no track or DE.What oil viscosity should I use? Is 4/15/07 time to switch to "summer" grade? Also, what is the correct oil filter? The catalog said Mahle OC-54, but the mechanic said "That's the wrong one" and installed a Mahle OC-61 at the rebuild.

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