Hi Folks. While changing spark plugs on my 2013 Wrangler I snapped pictures of intake valves using a camera, and pictures of piston tops using boroscope. On Wrangler and probably all other models with Pentastar you need to remove intake manifold to change spark plugs, thus exposing the valves. Was pleased with the cleanliness of the intake valves, but hoped for pistons to be cleaner. Even thought it probably isn't that bad. Hope some of you will find this interesting.
I've owned the Jeep since it was brand new, with 9 miles on it. The service when the pics were taken was performed at 36,723 miles. Here is how it has been driven and maintained,
Driving: 80%city/20%highway
Oil: Top shelf synthetics. Mainly Castrol black bottle few years ago, lately Pennzoil Platinum.
OCI: Between 4000 and 5000 miles. I always change oil in the spring and fall regardless of mileage. Last change at 33,271 miles.
Gas: Predominantly Exxon. On occasion Shell and Valero. Exxon is simply conveniently located on my daily route.
Additives: Run Techron Complete Fuel System Cleaner 20oz a tank before each oil change, i.e. 2 times per year.
I've owned the Jeep since it was brand new, with 9 miles on it. The service when the pics were taken was performed at 36,723 miles. Here is how it has been driven and maintained,
Driving: 80%city/20%highway
Oil: Top shelf synthetics. Mainly Castrol black bottle few years ago, lately Pennzoil Platinum.
OCI: Between 4000 and 5000 miles. I always change oil in the spring and fall regardless of mileage. Last change at 33,271 miles.
Gas: Predominantly Exxon. On occasion Shell and Valero. Exxon is simply conveniently located on my daily route.
Additives: Run Techron Complete Fuel System Cleaner 20oz a tank before each oil change, i.e. 2 times per year.