Modern oils have so much additive that they are all basically "good", the main thing is just to keep it changed regularly...for me my 96 cobra always gets full synthetic Mobil 1, with over 150K miles it still runs like new...I had a 289 run clean as a whistle with Castrol 10-30 for years...I'm sure you'll get a gazillion opinions on this but these are mine.
I dont kniw what type of lifters are in the car as it was rebuilt when i bought it. I think i should be well past the break in period by know as i drove it accross atlantic canada when i bought it, plue it was rebuilt back in 2002.
the big question i guess now is convential or synthetic??? is it worth the extra bucks to go to synthetic. Is there any reason why i should use synthetic in an old engine??
Like that has been said if its a flat tappet cam and lifters you need zinc or you can wear a cam lobe smooth.If it was me id pull the intake and see what lifters i have then pick which oil to run.The epa made most oil companies pull the zinc out because it will kill the cats on newer cars but older cars need it.
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