Fire started in engine from oil leak in cylinder head on Saturday, 9/9/23 at approximately 1:15 pm. Car had been running for around 2 hours with no signs or indication of malfunction. Driver pulled car over after entering Mt. Rainier National Forest at a viewpoint. At this point driver noticed engine was smoking. NO lights or indicators on dashboard lit up notifying of overheating or malfunction. The temperature gauge did not indicate the engine was over heating. The safety of 4 passengers was at risk. Fire started with four passengers including the driver in the car. Vehicle was located in Mt. Rainier National Forest where passengers and driver had no cellphone service. This also occurred in a National Forest during the high risk season for forest fires/wildfires. Fire could have put lives of passengers at risk as well as those in nearby area, if car went ablaze in the forest. With no service, preventing the car fire from turning into a forest fire would be very difficult. This problem occurred AFTER TSB on this vehicle was completed for safety recall 17S09-S1 in April 2014 at Bellingham Ford. The crack in the cylinder caused by the recall was patched by Bellingham Ford by filling it with Copper silicone rather than removing the cylinder and replacing it. Repair shop (Mike's Shop - Buckley Washington) that inspected vehicle after incident on Sept. 9th 2023, found that copper silicone patch had split causing oil to leak into engine and catch fire. This inspection indicates th