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We have used Walmart HD 20w-50 in our car for years. Four quarts with one bottle of the blue STP oil treatment.
We change once a year or 500 miles. Never down more than half a quart at change.
Motor has less than 10,000 miles on rebuild. Compression is mid 60’s all cylinders. No oil filter, but we do have an air filter. Car does mark it’s spot, very minimal.
Only driven in summer. Enjoy.