I have a 70 Monte Carlo with a 396 big block in it. I've been reading about how the newer SM and SN oils don't have enough Zinc in them to protect the cam on a flat tappet engine. This engine is pretty much stock except for it being bored out .60 Cam is stock.
I'm currently running 10W-40 Havoline conventional in it. I've tried a 10W-30 in it but the engine doesn't seem to like it and oil pressure is not where I want it. Engine probably only has 15,000 miles on the rebuild.
So what oil should I run in this engine? No synthetic recommendations please. I also want to stick to a 40 weight.
Are there any additives that you would recommend instead that can be added to the oil to add some Zinc back into it.? Thanks for any information.
Wayne
I'm currently running 10W-40 Havoline conventional in it. I've tried a 10W-30 in it but the engine doesn't seem to like it and oil pressure is not where I want it. Engine probably only has 15,000 miles on the rebuild.
So what oil should I run in this engine? No synthetic recommendations please. I also want to stick to a 40 weight.
Are there any additives that you would recommend instead that can be added to the oil to add some Zinc back into it.? Thanks for any information.
Wayne