It’s not a Hellcat engine but it has 247,000+ miles on it, 04 4Runner. It Was loosing coolant, about a cup every 10,000 miles, Oil tests showed trace amounts of coolant in the oil. Was also getting a P420 code for CAT efficiency which started as a once in a while CEL to weekly to daily after about a year so I decided to do head gaskets and replace the exhaust manifolds as the cats are integral to them. What a job, 3 days to take apart, 4 to go back together. After seeing the condition of the internals, especially the cross hatching still on the cylinder liners I decided to replace the timing chains, tensioners, and all guides, water pump, belts, lubed all idlers and tensioners while it was apart and see if it will run another 1/4 million miles. Been run on Wally World 5 Qt jugs of Valvoline 5W30 Extended Perf Full Syn oil and Mobil 1 M102A filters it’s whole life, at $35 an oil change doing it every 3-3500 miles is a no brainer. I run her hard, 100-110 mph for about the entire 26 mile to and 26 mile home daily highway work commute. No carbon build up here lol.
I use Amsoil 5w50 Signature Synthetic in the cat, change it about every 1500-2000 miles, soon as it starts getting dirty out it comes, cheap insurance.
Wonder if it’s going to look like this after 247,000 miles??
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