Here is a Puro Classic l4610 that was run for around 4400 miles. This is a customer's 2002 Civic with 213k miles that lost a head gasket recently. The owner added nearly a quart of Prolong during the OCI. It uses a little oil, and that was all he had available, I guess. There was also about a quart of coolant passed to the oil over the last 2000 miles of the OCI. Sludge had started to form in the engine, and the varnish has gotten darker during the OCI as well. VWB 5w-30 No tears, but wavy media with thickened oil residue in the can. F06E14E2 date code.