I must be dogging the crapola outta mine I'm right around 3,000 and at 53 % I'm always in mud /dirt and Dust daily and always in 4 wheel and up and down steep site makeshift access roads. Plus my 65 mile commute to work. (one way ) that's why my Jeep won me over if it can take what I have dished out then when it needs some love I won't just trade it off gonna keep it and heck who knows may buy another one so it can have a buddy to talk to in the driveway.
It drops off pretty fast when under 30%. I went through my receipts the other day, they’ve all been 6-8k miles. I changed it when the light came on.
I just had to comment when I saw that you mentioned Indestro tools. I have put literally hundreds of heads on 3.6s since the 3.6 first came out, and I used an Indestro 3/8" torque wrench (0-50 ft/lb beam style) for all but two of them. I use a large 1/2" ratchet to pull the final angles. I just never could be persuaded by the tool dealers that I needed electronic, digital measuring tools of any sort. Back in the day, I built big block Mopar engines, including the 440s and Hemis, using a 1/2" beam style torque wrench. I also collected a variety of different brand tools over the years. But the tools I bought in the '70s are still holding up, better than some of the newer, supposedly better brand tools have.
I don’t have any 1970’s owners manuals but most owners manuals in the 80’s always said 7500 mile intervals (unless you live in “severe conditions “) then it was 3750 on the odometer. The funny thing is reps from the car manufacturers could never really explain to us what “severe conditions” really were. Was it extreme heat, extreme cold or both. That covers about the entire country when “conditions are extreme “ at some point. Now this day and age tolerances are much tighter and quality of oils are better but it always seemed a mystery in that period. I’m still that 5K miles max. personally.
But after the first step it is consensual.........
