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Drive train, fuel, suspension, steering & brakes / Re: Engine Problems + Excessive Wear on Rockers = OIL!
« Last post by mdsalemi on Today at 13:39:58 »It's useless to explain but lubricant is more than ZDDP.
Martin, it is not useless to explain. I think we all get it.
We have flat tappets and the zinc issue was discovered and solved more than 20 years ago. A higher level of zinc IS required for our engines, higher than a modern motor oil designed for a car with a catalytic converter can deliver. This is why most of the oil manufacturers have at least one product in their offerings designed for older engines.
There is no problem in using an oil with a weight of 50. Indeed, all of the major oil manufacturers, and the most respected engine rebuilder for our engines, have specified a 50 weight oil (15W-50 or similar) or have formulated their oils with that weight and the proper amount of lubricant. There was absolutely nothing wrong with using a 40 weight either provided it is designed for an older engine.
This discussion came about because somebody had an engine failure at 2000 km not having anything to do with oil but by using substandard parts, or a bad engine rebuild or something similar not related to oil.
I learned all about this 20 years ago and nothing has changed since that time.