Quote:
Originally Posted by MTUpower
they are both 40 weight oil- so when warm they are 40. The "0" and "10" mean when cold they act as a lighter oil- so in the morning when cold the engine starts more quickly. In theory. Perhaps your car's engine is worn and you need the 10-40.
Remember it takes almost 30 minutes for the oil to warm up.
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My guess would be the engine is too worn for 0 weight oil
I don't think so. My oil temp gauge gets to temp in the Vette pretty quickly. May not be instant but certainly not 30 minutes unless it is freezing cold and you are idling it.