Thread: chevy 216 six cylinder

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Originally Posted by junkyardjeff

If the oil has not been changed regularly I would use 30# non detergent as thats what was used in them years ago,if you use detergent oil in a motor that is quite dirty it will loosen up the crud and cause problems. If the motor is really dirty I would suggest pulling the valve and side cover and drop the oil pan and give it a good cleaning and then you can use the modern detergent oils,I have neen using 30# detergent oil in a 57 235 thats in my 37 p/u but it was rebuilt and I know its clean. If its clean 30# detergent oil in the summer will be just fine.

yep you do not run detergent in a old engine thats has allways had non detergent in it this is a big NO NO and as no ZDDP in it as well .if any zinc on the wear parts cam lifter s etc the detergent could strip it or block it if you added a can to the oil . detergents have gone up in the past years in oil and do not add any help on older engines some of the old oil gets in the blocks its like moly past even in the hot for 24 hours that stuff hang on if it start s working loose inside the engine it could be bad news