A can of 5qt = 4.73 liters. 20w-50 Lucas Motor Oil, Made in USA. Lucas is a large and well-known oil manufacturer in the USA. They have specialized in special oils and oil additives, and hold the American flag very high. In Sweden, Lucas is not that big yet, but it is growing strongly as a good and high-quality oil product. Many customers ask for a Made in USA oil with a high zinc content and here we have it. ZDDP So what we call The zinc content of this oil is more than twice as high as required for an old Cadillac engine. The zinc content is so high that you must not use this oil for newer cars that have a catalytic converter, then the catalytic converter will fail. If you prefer a slightly thicker engine oil with a viscosity of 20w-50, this is a great engine oil. If you read what the workshop manual says, 20w-50 is a little too thick oil for a Cadillac engine. But many people ask for 20w-50 oil and think it works well. So if you only drive in the summer or have a worn engine, it's perfectly fine. It may take a little longer for the oil to reach all lubrication points if it's cold outside, so we don't think you should use this oil if it's freezing outside. As mentioned, the viscosity is 20w-50, which is extremely resistant to heat, but not suitable in cooler temperatures. So if you want a thicker oil that is Made in the USA with an excessive dose of zinc additive, this is it.
ZDDP?
One of the additives in motor oils is ZDDP (Zinc Diakyl Dithio Phosphate). This additive has roughly the same function as the surface-active, and smelly, additives in transmission oils. This is about helping the oil on surfaces that are exposed to extreme friction, for example the valve lifters that are pressed against the camshaft. ZDDP forms a film between the steel surfaces and protects them from metal-to-metal contact, which leads to rapid wear, and in the worst case failure. For environmental reasons, they want to reduce the amount of sulphated ash from motor vehicles, and one way is to reduce the zinc content in motor oils, i.e. the amount of ZDDP.
Tip!
Always change the oil filter when you change the oil. We recommend that you change the oil when you have driven 500 miles of mixed driving, if you only drive short drives and a lot in town, change at 300 miles. Is it the most long-distance driving and country roads you drive, change at 700 miles. But remember to always change once a year, even if you drive very little, because condensation and corrosive acids will mix with the oil. Change the oil and run the engine really warm before putting the car away for the winter.
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