Originally Posted by Dockhead
API CF4 - looks good Ken. Avoid anything synthetic and don't deviate from the grade.
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+1 for avoiding synthetics especially on older engines or engines which have not been run on synthetics previously. They exist purely to meet emissions specs.
Any C*-* greater than the original spec is ok. A multigrade that has a lower W (cold) and higher viscosity (2nd number = hot) is generally good for faster cranking on start and higher pressure / less oil burn when hot.
More importantly, whatever you use, change it and the filters often. Old dirty oil is never a good thing. No engine ever failed because the oil was changed too often.
Never use flushing
or running in oils or additives.
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